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<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_91LII8H9HHHK_zn_DocumentAndEntityInformationAbstract" xml:lang="en-US">Document And Entity Information [Abstract].</label>
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<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_dei_EntityRegistrantName" xml:lang="en-US">Entity Registrant Name</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_dei_EntityRegistrantName" xml:lang="en-US">Entity Registrant Name</label>
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<loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityCentralIndexKey" xlink:label="loc_79JGG6F7FFFI_dei_EntityCentralIndexKey" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_dei_EntityCentralIndexKey" xml:lang="en-US">Entity Central Index Key</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_dei_EntityCentralIndexKey" xml:lang="en-US">Entity Central Index Key</label>
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<loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_DocumentType" xlink:label="loc_4397K522K7669JF3GI3J_dei_DocumentType" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_dei_DocumentType" xml:lang="en-US">Document Type</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_dei_DocumentType" xml:lang="en-US">Document Type</label>
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<loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_DocumentPeriodEndDate" xlink:label="loc_79JGG6F7FFFI_dei_DocumentPeriodEndDate" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_dei_DocumentPeriodEndDate" xml:lang="en-US">Document Period End Date</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_dei_DocumentPeriodEndDate" xml:lang="en-US">Document Period End Date</label>
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<loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_AmendmentFlag" xlink:label="loc_4397K522K7669JF3GI3J_dei_AmendmentFlag" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_dei_AmendmentFlag" xml:lang="en-US">Amendment Flag</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_dei_AmendmentFlag" xml:lang="en-US">Amendment Flag</label>
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<loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_CurrentFiscalYearEndDate" xlink:label="loc_79JGG6F7FFFI_dei_CurrentFiscalYearEndDate" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_dei_CurrentFiscalYearEndDate" xml:lang="en-US">Current Fiscal Year End Date</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_dei_CurrentFiscalYearEndDate" xml:lang="en-US">Current Fiscal Year End Date</label>
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<loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityFilerCategory" xlink:label="loc_4397K522K7669JF3GI3J_dei_EntityFilerCategory" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_dei_EntityFilerCategory" xml:lang="en-US">Entity Filer Category</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_dei_EntityFilerCategory" xml:lang="en-US">Entity Filer Category</label>
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<loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_DocumentFiscalPeriodFocus" xlink:label="loc_79JGG6F7FFFI_dei_DocumentFiscalPeriodFocus" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_dei_DocumentFiscalPeriodFocus" xml:lang="en-US">Document Fiscal Period Focus</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_dei_DocumentFiscalPeriodFocus" xml:lang="en-US">Document Fiscal Period Focus</label>
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<loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_DocumentFiscalYearFocus" xlink:label="loc_4397K522K7669JF3GI3J_dei_DocumentFiscalYearFocus" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_dei_DocumentFiscalYearFocus" xml:lang="en-US">Document Fiscal Year Focus</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_dei_DocumentFiscalYearFocus" xml:lang="en-US">Document Fiscal Year Focus</label>
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<loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_TradingSymbol" xlink:label="loc_79JGG6F7FFFI_dei_TradingSymbol" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_dei_TradingSymbol" xml:lang="en-US">Trading Symbol</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_dei_TradingSymbol" xml:lang="en-US">Trading Symbol</label>
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<loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityCommonStockSharesOutstanding" xlink:label="loc_4397K522K7669JF3GI3J_dei_EntityCommonStockSharesOutstanding" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_dei_EntityCommonStockSharesOutstanding" xml:lang="en-US">Entity Common Stock Shares Outstanding</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_dei_EntityCommonStockSharesOutstanding" xml:lang="en-US">Entity Common Stock Shares Outstanding</label>
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<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementOfFinancialPositionAbstract" xlink:label="loc_79JGG6F7FFFI_us-gaap_StatementOfFinancialPositionAbstract" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_us-gaap_StatementOfFinancialPositionAbstract" xml:lang="en-US">Balance Sheets [Abstract]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_StatementOfFinancialPositionAbstract" xml:lang="en-US">Balance Sheets</label>
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<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AssetsCurrentAbstract" xlink:label="loc_4397K522K7669JF3GI3J_us-gaap_AssetsCurrentAbstract" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_AssetsCurrentAbstract" xml:lang="en-US">Assets Current [Abstract]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_AssetsCurrentAbstract" xml:lang="en-US">Current assets</label>
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<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:label="loc_79JGG6F7FFFI_us-gaap_CashAndCashEquivalentsAtCarryingValue" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_us-gaap_CashAndCashEquivalentsAtCarryingValue" xml:lang="en-US">Cash And Cash Equivalents At Carrying Value</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_CashAndCashEquivalentsAtCarryingValue" xml:lang="en-US">Cash and cash equivalents</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_CashAndCashEquivalentsAtCarryingValue" xml:lang="en-US">Cash and Cash Equivalents, at Carrying Value, Total</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_CashAndCashEquivalentsAtCarryingValue" xml:lang="en-US">Cash and cash equivalents - beginning of period</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_CashAndCashEquivalentsAtCarryingValue" xml:lang="en-US">Cash and cash equivalents- end of period</label>
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<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DepositsAssetsCurrent" xlink:label="loc_4397K522K7669JF3GI3J_us-gaap_DepositsAssetsCurrent" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_DepositsAssetsCurrent" xml:lang="en-US">Deposits Assets Current</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_DepositsAssetsCurrent" xml:lang="en-US">Fixed short term bank deposits - restricted</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_us-gaap_DepositsAssetsCurrent" xlink:to="lab_6519M744M9881LH5IK5L_us-gaap_DepositsAssetsCurrent"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PrepaidExpenseAndOtherAssetsCurrent" xlink:label="loc_79JGG6F7FFFI_us-gaap_PrepaidExpenseAndOtherAssetsCurrent" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_us-gaap_PrepaidExpenseAndOtherAssetsCurrent" xml:lang="en-US">Prepaid Expense And Other Assets Current</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_PrepaidExpenseAndOtherAssetsCurrent" xml:lang="en-US">Prepaid expenses and other</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_PrepaidExpenseAndOtherAssetsCurrent" xml:lang="en-US">Prepaid Expense and Other Assets, Current, Total</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_us-gaap_PrepaidExpenseAndOtherAssetsCurrent" xlink:to="lab_91LII8H9HHHK_us-gaap_PrepaidExpenseAndOtherAssetsCurrent"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AccountsAndOtherReceivablesNetCurrent" xlink:label="loc_4397K522K7669JF3GI3J_us-gaap_AccountsAndOtherReceivablesNetCurrent" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_AccountsAndOtherReceivablesNetCurrent" xml:lang="en-US">Accounts and Other Receivables, Net, Current</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_AccountsAndOtherReceivablesNetCurrent" xml:lang="en-US">Other receivables</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_us-gaap_AccountsAndOtherReceivablesNetCurrent" xlink:to="lab_6519M744M9881LH5IK5L_us-gaap_AccountsAndOtherReceivablesNetCurrent"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AssetsCurrent" xlink:label="loc_79JGG6F7FFFI_us-gaap_AssetsCurrent" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_us-gaap_AssetsCurrent" xml:lang="en-US">Assets Current</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_AssetsCurrent" xml:lang="en-US">Total current assets</label>
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<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OilAndGasPropertyFullCostMethodNet" xlink:label="loc_4397K522K7669JF3GI3J_us-gaap_OilAndGasPropertyFullCostMethodNet" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_OilAndGasPropertyFullCostMethodNet" xml:lang="en-US">Oil And Gas Property Full Cost Method Net</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_OilAndGasPropertyFullCostMethodNet" xml:lang="en-US">Unproved oil and gas properties, full cost method</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_OilAndGasPropertyFullCostMethodNet" xml:lang="en-US">Oil and Gas Property, Full Cost Method, Net, Total</label>
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<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet" xlink:label="loc_79JGG6F7FFFI_us-gaap_PropertyPlantAndEquipmentNet" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_us-gaap_PropertyPlantAndEquipmentNet" xml:lang="en-US">Property Plant And Equipment Net</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_PropertyPlantAndEquipmentNet" xml:lang="en-US">Property and equipment at cost Net of accumulated depreciation of $310,000 and $246,000</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_PropertyPlantAndEquipmentNet" xml:lang="en-US">Property, Plant and Equipment, Net, Total</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_PropertyPlantAndEquipmentNet" xml:lang="en-US">Property, Plant and Equipment, Net, Beginning Balance</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_PropertyPlantAndEquipmentNet" xml:lang="en-US">Property, Plant and Equipment, Net, Ending Balance</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_us-gaap_PropertyPlantAndEquipmentNet" xlink:to="lab_91LII8H9HHHK_us-gaap_PropertyPlantAndEquipmentNet"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OtherAssetsNoncurrentAbstract" xlink:label="loc_4397K522K7669JF3GI3J_us-gaap_OtherAssetsNoncurrentAbstract" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_OtherAssetsNoncurrentAbstract" xml:lang="en-US">Other Assets Noncurrent [Abstract]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_OtherAssetsNoncurrentAbstract" xml:lang="en-US">Other assets</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_us-gaap_OtherAssetsNoncurrentAbstract" xlink:to="lab_6519M744M9881LH5IK5L_us-gaap_OtherAssetsNoncurrentAbstract"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OtherAssetsNoncurrent" xlink:label="loc_79JGG6F7FFFI_us-gaap_OtherAssetsNoncurrent" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_us-gaap_OtherAssetsNoncurrent" xml:lang="en-US">Other Assets Noncurrent</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_OtherAssetsNoncurrent" xml:lang="en-US">Assets held for severance benefits</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_OtherAssetsNoncurrent" xml:lang="en-US">Other Assets, Noncurrent, Total</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_us-gaap_OtherAssetsNoncurrent" xlink:to="lab_91LII8H9HHHK_us-gaap_OtherAssetsNoncurrent"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_Assets" xlink:label="loc_4397K522K7669JF3GI3J_us-gaap_Assets" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_Assets" xml:lang="en-US">Assets</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_Assets" xml:lang="en-US">Total assets</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_us-gaap_Assets" xlink:to="lab_6519M744M9881LH5IK5L_us-gaap_Assets"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquityAbstract" xlink:label="loc_79JGG6F7FFFI_us-gaap_LiabilitiesAndStockholdersEquityAbstract" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_us-gaap_LiabilitiesAndStockholdersEquityAbstract" xml:lang="en-US">Liabilities And Stockholders Equity [Abstract]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_LiabilitiesAndStockholdersEquityAbstract" xml:lang="en-US">Liabilities and Stockholders' Equity</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_us-gaap_LiabilitiesAndStockholdersEquityAbstract" xlink:to="lab_91LII8H9HHHK_us-gaap_LiabilitiesAndStockholdersEquityAbstract"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LiabilitiesCurrentAbstract" xlink:label="loc_4397K522K7669JF3GI3J_us-gaap_LiabilitiesCurrentAbstract" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_LiabilitiesCurrentAbstract" xml:lang="en-US">Liabilities Current [Abstract]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_LiabilitiesCurrentAbstract" xml:lang="en-US">Current liabilities</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_us-gaap_LiabilitiesCurrentAbstract" xlink:to="lab_6519M744M9881LH5IK5L_us-gaap_LiabilitiesCurrentAbstract"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AccountsPayableCurrent" xlink:label="loc_79JGG6F7FFFI_us-gaap_AccountsPayableCurrent" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_us-gaap_AccountsPayableCurrent" xml:lang="en-US">Accounts Payable Current</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_AccountsPayableCurrent" xml:lang="en-US">Accounts payable</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_AccountsPayableCurrent" xml:lang="en-US">Accounts Payable, Current, Total</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_us-gaap_AccountsPayableCurrent" xlink:to="lab_91LII8H9HHHK_us-gaap_AccountsPayableCurrent"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AssetRetirementObligationCurrent" xlink:label="loc_4397K522K7669JF3GI3J_us-gaap_AssetRetirementObligationCurrent" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_AssetRetirementObligationCurrent" xml:lang="en-US">Asset Retirement Obligation Current</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_AssetRetirementObligationCurrent" xml:lang="en-US">Asset retirement obligation</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_AssetRetirementObligationCurrent" xml:lang="en-US">Asset Retirement Obligation, Current, Beginning Balance</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_AssetRetirementObligationCurrent" xml:lang="en-US">Asset Retirement Obligation, Current, Ending Balance</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_us-gaap_AssetRetirementObligationCurrent" xlink:to="lab_6519M744M9881LH5IK5L_us-gaap_AssetRetirementObligationCurrent"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AccruedLiabilitiesCurrent" xlink:label="loc_79JGG6F7FFFI_us-gaap_AccruedLiabilitiesCurrent" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_us-gaap_AccruedLiabilitiesCurrent" xml:lang="en-US">Accrued Liabilities Current</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_AccruedLiabilitiesCurrent" xml:lang="en-US">Accrued liabilities</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_AccruedLiabilitiesCurrent" xml:lang="en-US">Total accrued liabilities, current</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_us-gaap_AccruedLiabilitiesCurrent" xlink:to="lab_91LII8H9HHHK_us-gaap_AccruedLiabilitiesCurrent"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LiabilitiesCurrent" xlink:label="loc_4397K522K7669JF3GI3J_us-gaap_LiabilitiesCurrent" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_LiabilitiesCurrent" xml:lang="en-US">Liabilities Current</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_LiabilitiesCurrent" xml:lang="en-US">Total current liabilities</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_us-gaap_LiabilitiesCurrent" xlink:to="lab_6519M744M9881LH5IK5L_us-gaap_LiabilitiesCurrent"/>
<loc xlink:type="locator" xlink:href="zn-20130930.xsd#zn_EmployeeRelatedLiabilitiesNoncurrent" xlink:label="loc_79JGG6F7FFFI_zn_EmployeeRelatedLiabilitiesNoncurrent" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_zn_EmployeeRelatedLiabilitiesNoncurrent" xml:lang="en-US">Employee Related Liabilities Noncurrent</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_zn_EmployeeRelatedLiabilitiesNoncurrent" xml:lang="en-US">Provision for severance pay</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_91LII8H9HHHK_zn_EmployeeRelatedLiabilitiesNoncurrent" xml:lang="en-US">Total of the carrying values as of the balance sheet date of obligations incurred through that date and payable for obligations related to services received from employees, such as accrued salaries and bonuses, payroll taxes and fringe benefits. For classified balance sheets, used to reflect the noncurrent portion of the liabilities (due beyond one year or one operating cycle, if longer); for unclassified balance sheets, used to reflect the total liabilities (regardless of due date).</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_zn_EmployeeRelatedLiabilitiesNoncurrent" xlink:to="lab_91LII8H9HHHK_zn_EmployeeRelatedLiabilitiesNoncurrent"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_Liabilities" xlink:label="loc_4397K522K7669JF3GI3J_us-gaap_Liabilities" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_Liabilities" xml:lang="en-US">Liabilities</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_Liabilities" xml:lang="en-US">Total liabilities</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_us-gaap_Liabilities" xlink:to="lab_6519M744M9881LH5IK5L_us-gaap_Liabilities"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CommitmentsAndContingencies" xlink:label="loc_79JGG6F7FFFI_us-gaap_CommitmentsAndContingencies" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_us-gaap_CommitmentsAndContingencies" xml:lang="en-US">Commitments And Contingencies</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_CommitmentsAndContingencies" xml:lang="en-US">Commitments and contingencies (see Note 4)</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_us-gaap_CommitmentsAndContingencies" xlink:to="lab_91LII8H9HHHK_us-gaap_CommitmentsAndContingencies"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StockholdersEquityAbstract" xlink:label="loc_4397K522K7669JF3GI3J_us-gaap_StockholdersEquityAbstract" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_StockholdersEquityAbstract" xml:lang="en-US">Stockholders Equity [Abstract]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_StockholdersEquityAbstract" xml:lang="en-US">Stockholders' equity</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_us-gaap_StockholdersEquityAbstract" xlink:to="lab_6519M744M9881LH5IK5L_us-gaap_StockholdersEquityAbstract"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CommonStockValue" xlink:label="loc_79JGG6F7FFFI_us-gaap_CommonStockValue" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_us-gaap_CommonStockValue" xml:lang="en-US">Common Stock Value</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_CommonStockValue" xml:lang="en-US">Common stock, par value $.01; Authorized: 100,000,000: Issued and outstanding: 33,607,327 and 32,768,710 shares at September 30, 2013 and December 31, 2012 respectively</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_CommonStockValue" xml:lang="en-US">Common Stock, Value, Issued, Total</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_CommonStockValue" xml:lang="en-US">Common Stock, Value, Issued, Beginning Balance</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_CommonStockValue" xml:lang="en-US">Common Stock, Value, Issued, Ending Balance</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_us-gaap_CommonStockValue" xlink:to="lab_91LII8H9HHHK_us-gaap_CommonStockValue"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AdditionalPaidInCapitalCommonStock" xlink:label="loc_4397K522K7669JF3GI3J_us-gaap_AdditionalPaidInCapitalCommonStock" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_AdditionalPaidInCapitalCommonStock" xml:lang="en-US">Additional Paid In Capital Common Stock</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_AdditionalPaidInCapitalCommonStock" xml:lang="en-US">Additional paid-in capital</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_AdditionalPaidInCapitalCommonStock" xml:lang="en-US">Additional Paid in Capital, Common Stock, Beginning Balance</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_AdditionalPaidInCapitalCommonStock" xml:lang="en-US">Additional Paid in Capital, Common Stock, Ending Balance</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_us-gaap_AdditionalPaidInCapitalCommonStock" xlink:to="lab_6519M744M9881LH5IK5L_us-gaap_AdditionalPaidInCapitalCommonStock"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DevelopmentStageEnterpriseDeficitAccumulatedDuringDevelopmentStage" xlink:label="loc_79JGG6F7FFFI_us-gaap_DevelopmentStageEnterpriseDeficitAccumulatedDuringDevelopmentStage" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_us-gaap_DevelopmentStageEnterpriseDeficitAccumulatedDuringDevelopmentStage" xml:lang="en-US">Development Stage Enterprise Deficit Accumulated During Development Stage</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_DevelopmentStageEnterpriseDeficitAccumulatedDuringDevelopmentStage" xml:lang="en-US">Deficit accumulated in development stage</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_us-gaap_DevelopmentStageEnterpriseDeficitAccumulatedDuringDevelopmentStage" xlink:to="lab_91LII8H9HHHK_us-gaap_DevelopmentStageEnterpriseDeficitAccumulatedDuringDevelopmentStage"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StockholdersEquity" xlink:label="loc_4397K522K7669JF3GI3J_us-gaap_StockholdersEquity" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_StockholdersEquity" xml:lang="en-US">Stockholders Equity</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_StockholdersEquity" xml:lang="en-US">Total stockholders' equity</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_StockholdersEquity" xml:lang="en-US">Beginning Balances</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_StockholdersEquity" xml:lang="en-US">Ending Balances</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_us-gaap_StockholdersEquity" xlink:to="lab_6519M744M9881LH5IK5L_us-gaap_StockholdersEquity"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquity" xlink:label="loc_79JGG6F7FFFI_us-gaap_LiabilitiesAndStockholdersEquity" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_us-gaap_LiabilitiesAndStockholdersEquity" xml:lang="en-US">Liabilities And Stockholders Equity</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_LiabilitiesAndStockholdersEquity" xml:lang="en-US">Total liabilities and stockholders' equity</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_us-gaap_LiabilitiesAndStockholdersEquity" xlink:to="lab_91LII8H9HHHK_us-gaap_LiabilitiesAndStockholdersEquity"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment" xlink:label="loc_4397K522K7669JF3GI3J_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment" xml:lang="en-US">Accumulated Depreciation Depletion And Amortization Property Plant And Equipment</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment" xml:lang="en-US">Property and equipment, accumulated depreciation</label>
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<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CommonStockParOrStatedValuePerShare" xlink:label="loc_79JGG6F7FFFI_us-gaap_CommonStockParOrStatedValuePerShare" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_us-gaap_CommonStockParOrStatedValuePerShare" xml:lang="en-US">Common Stock Par Or Stated Value Per Share</label>
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<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CommonStockSharesAuthorized" xlink:label="loc_4397K522K7669JF3GI3J_us-gaap_CommonStockSharesAuthorized" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_CommonStockSharesAuthorized" xml:lang="en-US">Common Stock Shares Authorized</label>
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<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CommonStockSharesIssued" xlink:label="loc_79JGG6F7FFFI_us-gaap_CommonStockSharesIssued" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_us-gaap_CommonStockSharesIssued" xml:lang="en-US">Common Stock Shares Issued</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_CommonStockSharesIssued" xml:lang="en-US">Common stock, Issued</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_CommonStockSharesIssued" xml:lang="en-US">Common Stock, Shares, Issued, Total</label>
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<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CommonStockSharesOutstanding" xlink:label="loc_4397K522K7669JF3GI3J_us-gaap_CommonStockSharesOutstanding" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_CommonStockSharesOutstanding" xml:lang="en-US">Common Stock Shares Outstanding</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_CommonStockSharesOutstanding" xml:lang="en-US">Common stock, outstanding</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_CommonStockSharesOutstanding" xml:lang="en-US">Common Stock, Shares, Outstanding, Beginning Balance</label>
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<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeStatementAbstract" xlink:label="loc_79JGG6F7FFFI_us-gaap_IncomeStatementAbstract" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_us-gaap_IncomeStatementAbstract" xml:lang="en-US">Statements Of Operations [Abstract]</label>
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<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OperatingExpensesAbstract" xlink:label="loc_4397K522K7669JF3GI3J_us-gaap_OperatingExpensesAbstract" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_OperatingExpensesAbstract" xml:lang="en-US">Operating Expenses [Abstract]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_OperatingExpensesAbstract" xml:lang="en-US">General and administrative expenses</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_us-gaap_OperatingExpensesAbstract" xlink:to="lab_6519M744M9881LH5IK5L_us-gaap_OperatingExpensesAbstract"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ProfessionalFees" xlink:label="loc_79JGG6F7FFFI_us-gaap_ProfessionalFees" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_us-gaap_ProfessionalFees" xml:lang="en-US">Professional Fees</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_ProfessionalFees" xml:lang="en-US">Legal and professional</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_us-gaap_ProfessionalFees" xlink:to="lab_91LII8H9HHHK_us-gaap_ProfessionalFees"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LaborAndRelatedExpense" xlink:label="loc_4397K522K7669JF3GI3J_us-gaap_LaborAndRelatedExpense" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_LaborAndRelatedExpense" xml:lang="en-US">Labor And Related Expense</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_LaborAndRelatedExpense" xml:lang="en-US">Salaries</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_LaborAndRelatedExpense" xml:lang="en-US">Labor and Related Expense, Total</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_us-gaap_LaborAndRelatedExpense" xlink:to="lab_6519M744M9881LH5IK5L_us-gaap_LaborAndRelatedExpense"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OtherCostAndExpenseOperating" xlink:label="loc_79JGG6F7FFFI_us-gaap_OtherCostAndExpenseOperating" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_us-gaap_OtherCostAndExpenseOperating" xml:lang="en-US">Other Cost And Expense Operating</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_OtherCostAndExpenseOperating" xml:lang="en-US">Other</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_OtherCostAndExpenseOperating" xml:lang="en-US">Other Cost and Expense, Operating, Total</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_us-gaap_OtherCostAndExpenseOperating" xlink:to="lab_91LII8H9HHHK_us-gaap_OtherCostAndExpenseOperating"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ImpairmentOfOilAndGasProperties" xlink:label="loc_4397K522K7669JF3GI3J_us-gaap_ImpairmentOfOilAndGasProperties" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_ImpairmentOfOilAndGasProperties" xml:lang="en-US">Impairment Of Oil And Gas Properties</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_ImpairmentOfOilAndGasProperties" xml:lang="en-US">Impairment of unproved oil and gas properties</label>
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<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_us-gaap_ImpairmentOfOilAndGasProperties" xlink:to="lab_6519M744M9881LH5IK5L_us-gaap_ImpairmentOfOilAndGasProperties"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OperatingIncomeLoss" xlink:label="loc_79JGG6F7FFFI_us-gaap_OperatingIncomeLoss" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_us-gaap_OperatingIncomeLoss" xml:lang="en-US">Operating Income Loss</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_OperatingIncomeLoss" xml:lang="en-US">Loss from operations</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_us-gaap_OperatingIncomeLoss" xlink:to="lab_91LII8H9HHHK_us-gaap_OperatingIncomeLoss"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NonoperatingIncomeExpenseAbstract" xlink:label="loc_4397K522K7669JF3GI3J_us-gaap_NonoperatingIncomeExpenseAbstract" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_NonoperatingIncomeExpenseAbstract" xml:lang="en-US">Nonoperating Income Expense [Abstract]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_NonoperatingIncomeExpenseAbstract" xml:lang="en-US">Other income (expense), net</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_us-gaap_NonoperatingIncomeExpenseAbstract" xlink:to="lab_6519M744M9881LH5IK5L_us-gaap_NonoperatingIncomeExpenseAbstract"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OtherNonoperatingExpense" xlink:label="loc_79JGG6F7FFFI_us-gaap_OtherNonoperatingExpense" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_us-gaap_OtherNonoperatingExpense" xml:lang="en-US">Other Nonoperating Expense</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_OtherNonoperatingExpense" xml:lang="en-US">Other Nonoperating Expense, Total</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_OtherNonoperatingExpense" xml:lang="en-US">Termination of initial public offering</label>
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<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OtherNonoperatingIncomeExpense" xlink:label="loc_4397K522K7669JF3GI3J_us-gaap_OtherNonoperatingIncomeExpense" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_OtherNonoperatingIncomeExpense" xml:lang="en-US">Other Nonoperating Income Expense</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_OtherNonoperatingIncomeExpense" xml:lang="en-US">Other income, net</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_OtherNonoperatingIncomeExpense" xml:lang="en-US">Other Nonoperating Income (Expense), Total</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_us-gaap_OtherNonoperatingIncomeExpense" xlink:to="lab_6519M744M9881LH5IK5L_us-gaap_OtherNonoperatingIncomeExpense"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ForeignCurrencyTransactionGainLossBeforeTax" xlink:label="loc_79JGG6F7FFFI_us-gaap_ForeignCurrencyTransactionGainLossBeforeTax" />
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<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_us-gaap_ForeignCurrencyTransactionGainLossBeforeTax" xlink:to="lab_91LII8H9HHHK_us-gaap_ForeignCurrencyTransactionGainLossBeforeTax"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_InterestIncomeExpenseNonoperatingNet" xlink:label="loc_4397K522K7669JF3GI3J_us-gaap_InterestIncomeExpenseNonoperatingNet" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_InterestIncomeExpenseNonoperatingNet" xml:lang="en-US">Interest Income Expense Nonoperating Net</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_InterestIncomeExpenseNonoperatingNet" xml:lang="en-US">Interest income, net</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_us-gaap_InterestIncomeExpenseNonoperatingNet" xlink:to="lab_6519M744M9881LH5IK5L_us-gaap_InterestIncomeExpenseNonoperatingNet"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments" xlink:label="loc_79JGG6F7FFFI_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments" xml:lang="en-US">Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments" xml:lang="en-US">Pre-tax loss as reported</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments" xml:lang="en-US">Loss before income taxes</label>
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<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit" xlink:label="loc_4397K522K7669JF3GI3J_us-gaap_IncomeTaxExpenseBenefit" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_IncomeTaxExpenseBenefit" xml:lang="en-US">Income Tax Expense Benefit</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_IncomeTaxExpenseBenefit" xml:lang="en-US">Income taxes</label>
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<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_us-gaap_NetIncomeLoss" xml:lang="en-US">Net Income Loss</label>
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<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EarningsPerShareBasicAndDiluted" xlink:label="loc_4397K522K7669JF3GI3J_us-gaap_EarningsPerShareBasicAndDiluted" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_EarningsPerShareBasicAndDiluted" xml:lang="en-US">Earnings Per Share Basic And Diluted</label>
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<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted" xlink:label="loc_79JGG6F7FFFI_us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted" xml:lang="en-US">Weighted Average Number Of Share Outstanding Basic And Diluted</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted" xml:lang="en-US">Weighted-average shares outstanding - basic and diluted (in thousands)</label>
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<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementOfStockholdersEquityAbstract" xlink:label="loc_4397K522K7669JF3GI3J_us-gaap_StatementOfStockholdersEquityAbstract" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_StatementOfStockholdersEquityAbstract" xml:lang="en-US">Statements Of Changes In Stockholders' Equity [Abstract]</label>
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<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_79JGG6F7FFFI_us-gaap_StatementTable" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_us-gaap_StatementTable" xml:lang="en-US">Statement [Table]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_StatementTable" xml:lang="en-US">Statement [Table]</label>
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<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementEquityComponentsAxis" xlink:label="loc_4397K522K7669JF3GI3J_us-gaap_StatementEquityComponentsAxis" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_StatementEquityComponentsAxis" xml:lang="en-US">Statement Equity Components [Axis]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_StatementEquityComponentsAxis" xml:lang="en-US">Equity Components [Axis]</label>
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<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CommonStockMember" xlink:label="loc_79JGG6F7FFFI_us-gaap_CommonStockMember" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_us-gaap_CommonStockMember" xml:lang="en-US">Common Stock [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_CommonStockMember" xml:lang="en-US">Common Stock [Member]</label>
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<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AdditionalPaidInCapitalMember" xlink:label="loc_4397K522K7669JF3GI3J_us-gaap_AdditionalPaidInCapitalMember" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_AdditionalPaidInCapitalMember" xml:lang="en-US">Additional Paid In Capital [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_AdditionalPaidInCapitalMember" xml:lang="en-US">Additional Paid-in Capital [Member]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_us-gaap_AdditionalPaidInCapitalMember" xlink:to="lab_6519M744M9881LH5IK5L_us-gaap_AdditionalPaidInCapitalMember"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AccumulatedDeficitDuringDevelopmentStageMember" xlink:label="loc_79JGG6F7FFFI_us-gaap_AccumulatedDeficitDuringDevelopmentStageMember" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_us-gaap_AccumulatedDeficitDuringDevelopmentStageMember" xml:lang="en-US">Accumulated Deficit During Development Stage [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_AccumulatedDeficitDuringDevelopmentStageMember" xml:lang="en-US">Deficit Accumulated in Development Stage [Member]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_us-gaap_AccumulatedDeficitDuringDevelopmentStageMember" xlink:to="lab_91LII8H9HHHK_us-gaap_AccumulatedDeficitDuringDevelopmentStageMember"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_4397K522K7669JF3GI3J_us-gaap_EquityComponentDomain" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_EquityComponentDomain" xml:lang="en-US">Equity Component [Domain]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_EquityComponentDomain" xml:lang="en-US">Equity Component [Domain]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_us-gaap_EquityComponentDomain" xlink:to="lab_6519M744M9881LH5IK5L_us-gaap_EquityComponentDomain"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_79JGG6F7FFFI_us-gaap_StatementLineItems" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_us-gaap_StatementLineItems" xml:lang="en-US">Statement [Line Items]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_StatementLineItems" xml:lang="en-US">Statement [Line Items]</label>
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<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SharesOutstanding" xlink:label="loc_4397K522K7669JF3GI3J_us-gaap_SharesOutstanding" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_SharesOutstanding" xml:lang="en-US">Shares Outstanding</label>
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<loc xlink:type="locator" xlink:href="zn-20130930.xsd#zn_StockIssuedDuringPeriodSharesStockWarrantsExercised" xlink:label="loc_79JGG6F7FFFI_zn_StockIssuedDuringPeriodSharesStockWarrantsExercised" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_zn_StockIssuedDuringPeriodSharesStockWarrantsExercised" xml:lang="en-US">Stock Issued During Period Shares Stock Warrants Exercised</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_zn_StockIssuedDuringPeriodSharesStockWarrantsExercised" xml:lang="en-US">Funds received from sale of DSPP units and shares (in shares)</label>
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<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_91LII8H9HHHK_zn_StockIssuedDuringPeriodSharesStockWarrantsExercised" xml:lang="en-US">Number of shares issued during the period as a result of the exercise of warrants.</label>
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<loc xlink:type="locator" xlink:href="zn-20130930.xsd#zn_StockIssuedDuringPeriodValueStockWarrantsExercised" xlink:label="loc_4397K522K7669JF3GI3J_zn_StockIssuedDuringPeriodValueStockWarrantsExercised" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_zn_StockIssuedDuringPeriodValueStockWarrantsExercised" xml:lang="en-US">Stock Issued During Period Value Stock Warrants Exercised</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_zn_StockIssuedDuringPeriodValueStockWarrantsExercised" xml:lang="en-US">Funds received from sale of DSPP units and shares</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_6519M744M9881LH5IK5L_zn_StockIssuedDuringPeriodValueStockWarrantsExercised" xml:lang="en-US">Value stock issued during the period as a result of the exercise of warrants.</label>
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<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised" xlink:label="loc_79JGG6F7FFFI_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised" xml:lang="en-US">Stock Issued During Period Shares Stock Options Exercised</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised" xml:lang="en-US">Funds received from option exercises (in shares)</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised" xml:lang="en-US">Exercised</label>
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<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised" xlink:label="loc_4397K522K7669JF3GI3J_us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised" xml:lang="en-US">Stock Issued During Period, Value, Stock Options Exercised</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised" xml:lang="en-US">Funds received from option exercises</label>
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<loc xlink:type="locator" xlink:href="zn-20130930.xsd#zn_AdjustmentsToAdditionalPaidInCapitalOptionIssued" xlink:label="loc_79JGG6F7FFFI_zn_AdjustmentsToAdditionalPaidInCapitalOptionIssued" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_zn_AdjustmentsToAdditionalPaidInCapitalOptionIssued" xml:lang="en-US">Adjustments To Additional Paid In Capital Option Issued</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_zn_AdjustmentsToAdditionalPaidInCapitalOptionIssued" xml:lang="en-US">Value of options granted to employees, directors and others</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_91LII8H9HHHK_zn_AdjustmentsToAdditionalPaidInCapitalOptionIssued" xml:lang="en-US">Adjustments to Additional Paid in Capital, Option Issued</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_zn_AdjustmentsToAdditionalPaidInCapitalOptionIssued" xlink:to="lab_91LII8H9HHHK_zn_AdjustmentsToAdditionalPaidInCapitalOptionIssued"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementOfCashFlowsAbstract" xlink:label="loc_4397K522K7669JF3GI3J_us-gaap_StatementOfCashFlowsAbstract" />
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<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract" xlink:label="loc_79JGG6F7FFFI_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract" xml:lang="en-US">Net Cash Provided By Used In Operating Activities [Abstract]</label>
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<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:label="loc_4397K522K7669JF3GI3J_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xml:lang="en-US">Adjustments To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities [Abstract]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xml:lang="en-US">Adjustments required to reconcile net loss to net cash used in operating activities:</label>
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<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_Depreciation" xlink:label="loc_79JGG6F7FFFI_us-gaap_Depreciation" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_us-gaap_Depreciation" xml:lang="en-US">Depreciation</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_Depreciation" xml:lang="en-US">Depreciation</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_Depreciation" xml:lang="en-US">Depreciation, Total</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_us-gaap_Depreciation" xlink:to="lab_91LII8H9HHHK_us-gaap_Depreciation"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensation" xlink:label="loc_4397K522K7669JF3GI3J_us-gaap_ShareBasedCompensation" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_ShareBasedCompensation" xml:lang="en-US">Share Based Compensation</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_ShareBasedCompensation" xml:lang="en-US">Compensation cost of warrant and option issuances</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_ShareBasedCompensation" xml:lang="en-US">Officer, director and other fees, paid via common stock</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_ShareBasedCompensation" xml:lang="en-US">Share-based Compensation, Total</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_us-gaap_ShareBasedCompensation" xlink:to="lab_6519M744M9881LH5IK5L_us-gaap_ShareBasedCompensation"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AdjustmentOfWarrantsGrantedForServices" xlink:label="loc_79JGG6F7FFFI_us-gaap_AdjustmentOfWarrantsGrantedForServices" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_us-gaap_AdjustmentOfWarrantsGrantedForServices" xml:lang="en-US">Adjustment Of Warrants Granted For Services</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_AdjustmentOfWarrantsGrantedForServices" xml:lang="en-US">Cost of options issued to employees, directors &amp; others</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_us-gaap_AdjustmentOfWarrantsGrantedForServices" xlink:to="lab_91LII8H9HHHK_us-gaap_AdjustmentOfWarrantsGrantedForServices"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OtherNoncashIncome" xlink:label="loc_4397K522K7669JF3GI3J_us-gaap_OtherNoncashIncome" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_OtherNoncashIncome" xml:lang="en-US">Other Noncash Income</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_OtherNoncashIncome" xml:lang="en-US">Interest on short term bank deposits</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_us-gaap_OtherNoncashIncome" xlink:to="lab_6519M744M9881LH5IK5L_us-gaap_OtherNoncashIncome"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PaidInKindInterest" xlink:label="loc_79JGG6F7FFFI_us-gaap_PaidInKindInterest" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_us-gaap_PaidInKindInterest" xml:lang="en-US">Paid In Kind Interest</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_PaidInKindInterest" xml:lang="en-US">Interest paid through issuance of common stock</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_us-gaap_PaidInKindInterest" xlink:to="lab_91LII8H9HHHK_us-gaap_PaidInKindInterest"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OtherNoncashExpense" xlink:label="loc_4397K522K7669JF3GI3J_us-gaap_OtherNoncashExpense" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_OtherNoncashExpense" xml:lang="en-US">Other Noncash Expense</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_OtherNoncashExpense" xml:lang="en-US">Write-off of costs associated with public offering</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_us-gaap_OtherNoncashExpense" xlink:to="lab_6519M744M9881LH5IK5L_us-gaap_OtherNoncashExpense"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_GainLossOnSaleOfPropertyPlantEquipment" xlink:label="loc_79JGG6F7FFFI_us-gaap_GainLossOnSaleOfPropertyPlantEquipment" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_us-gaap_GainLossOnSaleOfPropertyPlantEquipment" xml:lang="en-US">Gain Loss On Sale Of Property Plant Equipment</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_GainLossOnSaleOfPropertyPlantEquipment" xml:lang="en-US">Gain (Loss) on Sale of Property Plant Equipment, Total</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_GainLossOnSaleOfPropertyPlantEquipment" xml:lang="en-US">Loss on disposal of equipment</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_us-gaap_GainLossOnSaleOfPropertyPlantEquipment" xlink:to="lab_91LII8H9HHHK_us-gaap_GainLossOnSaleOfPropertyPlantEquipment"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncreaseDecreaseInAssetRetirementObligations" xlink:label="loc_4397K522K7669JF3GI3J_us-gaap_IncreaseDecreaseInAssetRetirementObligations" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_IncreaseDecreaseInAssetRetirementObligations" xml:lang="en-US">Increase (Decrease) in Asset Retirement Obligations</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_IncreaseDecreaseInAssetRetirementObligations" xml:lang="en-US">Asset retirement obligation</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_us-gaap_IncreaseDecreaseInAssetRetirementObligations" xlink:to="lab_6519M744M9881LH5IK5L_us-gaap_IncreaseDecreaseInAssetRetirementObligations"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncreaseDecreaseInOperatingCapitalAbstract" xlink:label="loc_79JGG6F7FFFI_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract" xml:lang="en-US">Increase Decrease In Operating Capital [Abstract]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract" xml:lang="en-US">Change in assets and liabilities, net:</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract" xlink:to="lab_91LII8H9HHHK_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncreaseDecreaseInInventories" xlink:label="loc_4397K522K7669JF3GI3J_us-gaap_IncreaseDecreaseInInventories" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_IncreaseDecreaseInInventories" xml:lang="en-US">Increase Decrease In Inventories</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_IncreaseDecreaseInInventories" xml:lang="en-US">Increase (Decrease) in Inventories, Total</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_IncreaseDecreaseInInventories" xml:lang="en-US">Decrease in inventories</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_us-gaap_IncreaseDecreaseInInventories" xlink:to="lab_6519M744M9881LH5IK5L_us-gaap_IncreaseDecreaseInInventories"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets" xlink:label="loc_79JGG6F7FFFI_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets" xml:lang="en-US">Increase Decrease In Prepaid Deferred Expense And Other Assets</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets" xml:lang="en-US">Increase (Decrease) in Prepaid Expense and Other Assets, Total</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets" xml:lang="en-US">Prepaid expenses and other</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets" xlink:to="lab_91LII8H9HHHK_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncreaseDecreaseInOtherCurrentAssets" xlink:label="loc_4397K522K7669JF3GI3J_us-gaap_IncreaseDecreaseInOtherCurrentAssets" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_IncreaseDecreaseInOtherCurrentAssets" xml:lang="en-US">Increase (Decrease) in Other Current Assets</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_IncreaseDecreaseInOtherCurrentAssets" xml:lang="en-US">Change in other receivables</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_us-gaap_IncreaseDecreaseInOtherCurrentAssets" xlink:to="lab_6519M744M9881LH5IK5L_us-gaap_IncreaseDecreaseInOtherCurrentAssets"/>
<loc xlink:type="locator" xlink:href="zn-20130930.xsd#zn_IncreaseDecreaseInAccruedSeverancePayNetOfSeverancePayFund" xlink:label="loc_79JGG6F7FFFI_zn_IncreaseDecreaseInAccruedSeverancePayNetOfSeverancePayFund" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_zn_IncreaseDecreaseInAccruedSeverancePayNetOfSeverancePayFund" xml:lang="en-US">Increase Decrease In Accrued Severance Pay Net Of Severance Pay Fund</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_zn_IncreaseDecreaseInAccruedSeverancePayNetOfSeverancePayFund" xml:lang="en-US">Severance pay, net</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_91LII8H9HHHK_zn_IncreaseDecreaseInAccruedSeverancePayNetOfSeverancePayFund" xml:lang="en-US">Increase Decrease In Accrued Severance Pay Net Of Severance Pay Fund</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_91LII8H9HHHK_zn_IncreaseDecreaseInAccruedSeverancePayNetOfSeverancePayFund" xml:lang="en-US">Severance pay, net</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_zn_IncreaseDecreaseInAccruedSeverancePayNetOfSeverancePayFund" xlink:to="lab_91LII8H9HHHK_zn_IncreaseDecreaseInAccruedSeverancePayNetOfSeverancePayFund"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsPayable" xlink:label="loc_4397K522K7669JF3GI3J_us-gaap_IncreaseDecreaseInAccountsPayable" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_IncreaseDecreaseInAccountsPayable" xml:lang="en-US">Increase Decrease In Accounts Payable</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_IncreaseDecreaseInAccountsPayable" xml:lang="en-US">Accounts payable</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_IncreaseDecreaseInAccountsPayable" xml:lang="en-US">Increase (Decrease) in Accounts Payable, Total</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_us-gaap_IncreaseDecreaseInAccountsPayable" xlink:to="lab_6519M744M9881LH5IK5L_us-gaap_IncreaseDecreaseInAccountsPayable"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncreaseDecreaseInAccruedLiabilities" xlink:label="loc_79JGG6F7FFFI_us-gaap_IncreaseDecreaseInAccruedLiabilities" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_us-gaap_IncreaseDecreaseInAccruedLiabilities" xml:lang="en-US">Increase Decrease In Accrued Liabilities</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_IncreaseDecreaseInAccruedLiabilities" xml:lang="en-US">Accrued liabilities</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_IncreaseDecreaseInAccruedLiabilities" xml:lang="en-US">Increase (Decrease) in Accrued Liabilities, Total</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_us-gaap_IncreaseDecreaseInAccruedLiabilities" xlink:to="lab_91LII8H9HHHK_us-gaap_IncreaseDecreaseInAccruedLiabilities"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncreaseDecreaseInDeferredCompensation" xlink:label="loc_4397K522K7669JF3GI3J_us-gaap_IncreaseDecreaseInDeferredCompensation" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_IncreaseDecreaseInDeferredCompensation" xml:lang="en-US">Increase Decrease In Deferred Compensation</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_IncreaseDecreaseInDeferredCompensation" xml:lang="en-US">Increase in deferred officers' compensation (net)</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_us-gaap_IncreaseDecreaseInDeferredCompensation" xlink:to="lab_6519M744M9881LH5IK5L_us-gaap_IncreaseDecreaseInDeferredCompensation"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations" xlink:label="loc_79JGG6F7FFFI_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations" xml:lang="en-US">Net Cash Provided by (Used in) Operating Activities, Continuing Operations</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations" xml:lang="en-US">Net cash used in operating activities</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations" xlink:to="lab_91LII8H9HHHK_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:label="loc_4397K522K7669JF3GI3J_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xml:lang="en-US">Net Cash Provided By Used In Investing Activities [Abstract]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xml:lang="en-US">Cash flows from investing activities</label>
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<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PaymentsForProceedsFromShortTermInvestments" xlink:label="loc_79JGG6F7FFFI_us-gaap_PaymentsForProceedsFromShortTermInvestments" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_us-gaap_PaymentsForProceedsFromShortTermInvestments" xml:lang="en-US">Payments For Proceeds From Short Term Investments</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_PaymentsForProceedsFromShortTermInvestments" xml:lang="en-US">Payments for (Proceeds from) Short-term Investments, Total</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_PaymentsForProceedsFromShortTermInvestments" xml:lang="en-US">Investment in short term bank deposits - restricted</label>
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<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PaymentsToAcquirePropertyPlantAndEquipment" xlink:label="loc_4397K522K7669JF3GI3J_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment" xml:lang="en-US">Payments To Acquire Property Plant And Equipment</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment" xml:lang="en-US">Payments to Acquire Property, Plant, and Equipment, Total</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment" xml:lang="en-US">Acquisition of property and equipment</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment" xlink:to="lab_6519M744M9881LH5IK5L_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PaymentsToAcquireOilAndGasProperty" xlink:label="loc_79JGG6F7FFFI_us-gaap_PaymentsToAcquireOilAndGasProperty" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_us-gaap_PaymentsToAcquireOilAndGasProperty" xml:lang="en-US">Payments To Acquire Oil And Gas Property</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_PaymentsToAcquireOilAndGasProperty" xml:lang="en-US">Investment in unproved oil and gas properties</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_us-gaap_PaymentsToAcquireOilAndGasProperty" xlink:to="lab_91LII8H9HHHK_us-gaap_PaymentsToAcquireOilAndGasProperty"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations" xlink:label="loc_4397K522K7669JF3GI3J_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations" xml:lang="en-US">Net Cash Provided by (Used in) Investing Activities, Continuing Operations</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations" xml:lang="en-US">Net cash used in investing activities</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations" xlink:to="lab_6519M744M9881LH5IK5L_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:label="loc_79JGG6F7FFFI_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xml:lang="en-US">Net Cash Provided By Used In Financing Activities [Abstract]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xml:lang="en-US">Cash flows from financing activities</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:to="lab_91LII8H9HHHK_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract"/>
<loc xlink:type="locator" xlink:href="zn-20130930.xsd#zn_DecreaseInFinancingCosts" xlink:label="loc_4397K522K7669JF3GI3J_zn_DecreaseInFinancingCosts" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_zn_DecreaseInFinancingCosts" xml:lang="en-US">Decrease In Financing Costs</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_zn_DecreaseInFinancingCosts" xml:lang="en-US">Deferred financing costs on debt conversions and modification</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_6519M744M9881LH5IK5L_zn_DecreaseInFinancingCosts" xml:lang="en-US">Decrease in deferred financing costs.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_zn_DecreaseInFinancingCosts" xlink:to="lab_6519M744M9881LH5IK5L_zn_DecreaseInFinancingCosts"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ProceedsFromRelatedPartyDebt" xlink:label="loc_79JGG6F7FFFI_us-gaap_ProceedsFromRelatedPartyDebt" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_us-gaap_ProceedsFromRelatedPartyDebt" xml:lang="en-US">Proceeds From Related Party Debt</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_ProceedsFromRelatedPartyDebt" xml:lang="en-US">Loan proceeds - related party</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_us-gaap_ProceedsFromRelatedPartyDebt" xlink:to="lab_91LII8H9HHHK_us-gaap_ProceedsFromRelatedPartyDebt"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RepaymentsOfRelatedPartyDebt" xlink:label="loc_4397K522K7669JF3GI3J_us-gaap_RepaymentsOfRelatedPartyDebt" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_RepaymentsOfRelatedPartyDebt" xml:lang="en-US">Repayments Of Related Party Debt</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_RepaymentsOfRelatedPartyDebt" xml:lang="en-US">Loan principal repayments - related party</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_us-gaap_RepaymentsOfRelatedPartyDebt" xlink:to="lab_6519M744M9881LH5IK5L_us-gaap_RepaymentsOfRelatedPartyDebt"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ProceedsFromOtherDebt" xlink:label="loc_79JGG6F7FFFI_us-gaap_ProceedsFromOtherDebt" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_us-gaap_ProceedsFromOtherDebt" xml:lang="en-US">Proceeds From Other Debt</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_ProceedsFromOtherDebt" xml:lang="en-US">Loan proceeds - other</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_us-gaap_ProceedsFromOtherDebt" xlink:to="lab_91LII8H9HHHK_us-gaap_ProceedsFromOtherDebt"/>
<loc xlink:type="locator" xlink:href="zn-20130930.xsd#zn_ProceedsFromIssuanceOfCommonStockAndWarrantsNet" xlink:label="loc_4397K522K7669JF3GI3J_zn_ProceedsFromIssuanceOfCommonStockAndWarrantsNet" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_zn_ProceedsFromIssuanceOfCommonStockAndWarrantsNet" xml:lang="en-US">Proceeds From Issuance Of Common Stock And Warrants Net</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_zn_ProceedsFromIssuanceOfCommonStockAndWarrantsNet" xml:lang="en-US">Proceeds from sale of stock and exercise of warrants</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_6519M744M9881LH5IK5L_zn_ProceedsFromIssuanceOfCommonStockAndWarrantsNet" xml:lang="en-US">Proceeds from warrant and options exercise</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_6519M744M9881LH5IK5L_zn_ProceedsFromIssuanceOfCommonStockAndWarrantsNet" xml:lang="en-US">The cash inflow from the additional capital contribution to the entity including any warrants issued. Proceeds are net of cash outflows for issuance costs related to the transaction.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_zn_ProceedsFromIssuanceOfCommonStockAndWarrantsNet" xlink:to="lab_6519M744M9881LH5IK5L_zn_ProceedsFromIssuanceOfCommonStockAndWarrantsNet"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PaymentOfFinancingAndStockIssuanceCosts" xlink:label="loc_79JGG6F7FFFI_us-gaap_PaymentOfFinancingAndStockIssuanceCosts" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_us-gaap_PaymentOfFinancingAndStockIssuanceCosts" xml:lang="en-US">Payment Of Financing And Stock Issuance Costs</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_PaymentOfFinancingAndStockIssuanceCosts" xml:lang="en-US">Payment of Financing and Stock Issuance Costs, Total</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_PaymentOfFinancingAndStockIssuanceCosts" xml:lang="en-US">Costs associated with the issuance of stock and warrants</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_us-gaap_PaymentOfFinancingAndStockIssuanceCosts" xlink:to="lab_91LII8H9HHHK_us-gaap_PaymentOfFinancingAndStockIssuanceCosts"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations" xlink:label="loc_4397K522K7669JF3GI3J_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations" xml:lang="en-US">Net Cash Provided by (Used in) Financing Activities, Continuing Operations</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations" xml:lang="en-US">Net cash provided by financing activities</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations" xlink:to="lab_6519M744M9881LH5IK5L_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease" xlink:label="loc_79JGG6F7FFFI_us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease" xml:lang="en-US">Cash And Cash Equivalents Period Increase Decrease</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease" xml:lang="en-US">Net increase (decrease) in cash and cash equivalents</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease" xlink:to="lab_91LII8H9HHHK_us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SupplementalCashFlowInformationAbstract" xlink:label="loc_4397K522K7669JF3GI3J_us-gaap_SupplementalCashFlowInformationAbstract" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_SupplementalCashFlowInformationAbstract" xml:lang="en-US">Supplemental Cash Flow Information [Abstract]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_SupplementalCashFlowInformationAbstract" xml:lang="en-US">Supplemental information</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_us-gaap_SupplementalCashFlowInformationAbstract" xlink:to="lab_6519M744M9881LH5IK5L_us-gaap_SupplementalCashFlowInformationAbstract"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_InterestPaid" xlink:label="loc_79JGG6F7FFFI_us-gaap_InterestPaid" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_us-gaap_InterestPaid" xml:lang="en-US">Interest Paid</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_InterestPaid" xml:lang="en-US">Cash paid for interest</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_InterestPaid" xml:lang="en-US">Interest Paid, Total</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_InterestPaid" xml:lang="en-US">Cash paid for interest</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_us-gaap_InterestPaid" xlink:to="lab_91LII8H9HHHK_us-gaap_InterestPaid"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeTaxesPaid" xlink:label="loc_4397K522K7669JF3GI3J_us-gaap_IncomeTaxesPaid" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_IncomeTaxesPaid" xml:lang="en-US">Income Taxes Paid</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_IncomeTaxesPaid" xml:lang="en-US">Cash paid for income taxes</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_IncomeTaxesPaid" xml:lang="en-US">Cash paid for income taxes</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_us-gaap_IncomeTaxesPaid" xlink:to="lab_6519M744M9881LH5IK5L_us-gaap_IncomeTaxesPaid"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract" xlink:label="loc_79JGG6F7FFFI_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract" xml:lang="en-US">Cash Flow Noncash Investing And Financing Activities Disclosure [Abstract]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract" xml:lang="en-US">Non-cash investing and financing activities:</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract" xlink:to="lab_91LII8H9HHHK_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StockIssued1" xlink:label="loc_4397K522K7669JF3GI3J_us-gaap_StockIssued1" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_StockIssued1" xml:lang="en-US">Stock Issued 1</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_StockIssued1" xml:lang="en-US">Payment of note payable through issuance of common stock</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_us-gaap_StockIssued1" xlink:to="lab_6519M744M9881LH5IK5L_us-gaap_StockIssued1"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NotesIssued1" xlink:label="loc_79JGG6F7FFFI_us-gaap_NotesIssued1" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_us-gaap_NotesIssued1" xml:lang="en-US">Notes Issued 1</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_NotesIssued1" xml:lang="en-US">Payment of accounts payable through issuance of note payable</label>
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<loc xlink:type="locator" xlink:href="zn-20130930.xsd#zn_IssuanceOfCommonStockValueInPaymentOfFinancingCost" xlink:label="loc_4397K522K7669JF3GI3J_zn_IssuanceOfCommonStockValueInPaymentOfFinancingCost" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_zn_IssuanceOfCommonStockValueInPaymentOfFinancingCost" xml:lang="en-US">Issuance Of Common Stock Value In Payment Of Financing Cost</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_zn_IssuanceOfCommonStockValueInPaymentOfFinancingCost" xml:lang="en-US">Financing cost paid through issuance of common stock</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_6519M744M9881LH5IK5L_zn_IssuanceOfCommonStockValueInPaymentOfFinancingCost" xml:lang="en-US">Issuance Of Common Stock Value In Payment Of Financing Cost</label>
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<loc xlink:type="locator" xlink:href="zn-20130930.xsd#zn_SupplementalAccountsPayable" xlink:label="loc_79JGG6F7FFFI_zn_SupplementalAccountsPayable" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_zn_SupplementalAccountsPayable" xml:lang="en-US">Supplemental Accounts Payable</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_zn_SupplementalAccountsPayable" xml:lang="en-US">Increase in accounts payable for financing costs</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_91LII8H9HHHK_zn_SupplementalAccountsPayable" xml:lang="en-US">Supplemental Accounts Payable</label>
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<loc xlink:type="locator" xlink:href="zn-20130930.xsd#zn_SupplementalNoncashTransactions" xlink:label="loc_4397K522K7669JF3GI3J_zn_SupplementalNoncashTransactions" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_zn_SupplementalNoncashTransactions" xml:lang="en-US">Supplemental Noncash Transactions</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_zn_SupplementalNoncashTransactions" xml:lang="en-US">Waived interest on debt conversions</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_6519M744M9881LH5IK5L_zn_SupplementalNoncashTransactions" xml:lang="en-US">Other non-cash transactions for the period not otherwise defined shall be provided in supplemental disclosures to the statement of cash flow.</label>
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<loc xlink:type="locator" xlink:href="zn-20130930.xsd#zn_ConversionOfAccruedLiabilitiesToCommonStock" xlink:label="loc_79JGG6F7FFFI_zn_ConversionOfAccruedLiabilitiesToCommonStock" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_zn_ConversionOfAccruedLiabilitiesToCommonStock" xml:lang="en-US">Conversion Of Accrued Liabilities To Common Stock</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_zn_ConversionOfAccruedLiabilitiesToCommonStock" xml:lang="en-US">Shares issued for debt conversion</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_91LII8H9HHHK_zn_ConversionOfAccruedLiabilitiesToCommonStock" xml:lang="en-US">Conversion Of Accrued Liabilities To Common Stock</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_zn_ConversionOfAccruedLiabilitiesToCommonStock" xlink:to="lab_91LII8H9HHHK_zn_ConversionOfAccruedLiabilitiesToCommonStock"/>
<loc xlink:type="locator" xlink:href="zn-20130930.xsd#zn_IssuanceOfWarrantsToPlacementAgentInPublicOffering" xlink:label="loc_4397K522K7669JF3GI3J_zn_IssuanceOfWarrantsToPlacementAgentInPublicOffering" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_zn_IssuanceOfWarrantsToPlacementAgentInPublicOffering" xml:lang="en-US">Issuance Of Warrants To Placement Agent In Public Offering</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_zn_IssuanceOfWarrantsToPlacementAgentInPublicOffering" xml:lang="en-US">Value of warrants granted to underwriters</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_6519M744M9881LH5IK5L_zn_IssuanceOfWarrantsToPlacementAgentInPublicOffering" xml:lang="en-US">Issuance Of Warrants To Placement Agent In Public Offering</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_zn_IssuanceOfWarrantsToPlacementAgentInPublicOffering" xlink:to="lab_6519M744M9881LH5IK5L_zn_IssuanceOfWarrantsToPlacementAgentInPublicOffering"/>
<loc xlink:type="locator" xlink:href="zn-20130930.xsd#zn_SupplementalDeferredFinancingCosts" xlink:label="loc_79JGG6F7FFFI_zn_SupplementalDeferredFinancingCosts" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_zn_SupplementalDeferredFinancingCosts" xml:lang="en-US">Supplemental Deferred Financing Costs</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_zn_SupplementalDeferredFinancingCosts" xml:lang="en-US">Deferred financing costs</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_91LII8H9HHHK_zn_SupplementalDeferredFinancingCosts" xml:lang="en-US">Supplemental Deferred financing costs</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_zn_SupplementalDeferredFinancingCosts" xlink:to="lab_91LII8H9HHHK_zn_SupplementalDeferredFinancingCosts"/>
<loc xlink:type="locator" xlink:href="zn-20130930.xsd#zn_CapitalizedCostsOfOptionsRelatedToOilAndGasProperties" xlink:label="loc_4397K522K7669JF3GI3J_zn_CapitalizedCostsOfOptionsRelatedToOilAndGasProperties" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_zn_CapitalizedCostsOfOptionsRelatedToOilAndGasProperties" xml:lang="en-US">Capitalized Costs Of Options Related to Oil And Gas Properties</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_zn_CapitalizedCostsOfOptionsRelatedToOilAndGasProperties" xml:lang="en-US">Cost of options capitalized to oil &amp; gas properties</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_6519M744M9881LH5IK5L_zn_CapitalizedCostsOfOptionsRelatedToOilAndGasProperties" xml:lang="en-US">Capitalized costs of options related to oil and gas properties.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_zn_CapitalizedCostsOfOptionsRelatedToOilAndGasProperties" xlink:to="lab_6519M744M9881LH5IK5L_zn_CapitalizedCostsOfOptionsRelatedToOilAndGasProperties"/>
<loc xlink:type="locator" xlink:href="zn-20130930.xsd#zn_NoncashInvestmentInOilAndGasProperties" xlink:label="loc_79JGG6F7FFFI_zn_NoncashInvestmentInOilAndGasProperties" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_zn_NoncashInvestmentInOilAndGasProperties" xml:lang="en-US">Noncash Investment In Oil And Gas Properties</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_zn_NoncashInvestmentInOilAndGasProperties" xml:lang="en-US">Investment in oil &amp; gas properties</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_91LII8H9HHHK_zn_NoncashInvestmentInOilAndGasProperties" xml:lang="en-US">Non cash investment in oil and gas properties.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_zn_NoncashInvestmentInOilAndGasProperties" xlink:to="lab_91LII8H9HHHK_zn_NoncashInvestmentInOilAndGasProperties"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_TransferOfInvestments" xlink:label="loc_4397K522K7669JF3GI3J_us-gaap_TransferOfInvestments" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_TransferOfInvestments" xml:lang="en-US">Transfer Of Investments</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_TransferOfInvestments" xml:lang="en-US">Transfer of inventory to oil and gas properties</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_us-gaap_TransferOfInvestments" xlink:to="lab_6519M744M9881LH5IK5L_us-gaap_TransferOfInvestments"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract" xlink:label="loc_79JGG6F7FFFI_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract" xml:lang="en-US">Basis of Presentation [Abstract]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract" xml:lang="en-US">Basis of Presentation</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract" xlink:to="lab_91LII8H9HHHK_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NatureOfOperations" xlink:label="loc_4397K522K7669JF3GI3J_us-gaap_NatureOfOperations" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_NatureOfOperations" xml:lang="en-US">Nature of Operations [Text Block]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_NatureOfOperations" xml:lang="en-US">Basis of Presentation</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_us-gaap_NatureOfOperations" xlink:to="lab_6519M744M9881LH5IK5L_us-gaap_NatureOfOperations"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AccountingPoliciesAbstract" xlink:label="loc_79JGG6F7FFFI_us-gaap_AccountingPoliciesAbstract" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_us-gaap_AccountingPoliciesAbstract" xml:lang="en-US">Summary of Significant Accounting Policies [Abstract]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_us-gaap_AccountingPoliciesAbstract" xlink:to="lab_91LII8H9HHHK_us-gaap_AccountingPoliciesAbstract"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SignificantAccountingPoliciesTextBlock" xlink:label="loc_4397K522K7669JF3GI3J_us-gaap_SignificantAccountingPoliciesTextBlock" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_SignificantAccountingPoliciesTextBlock" xml:lang="en-US">Significant Accounting Policies [Text Block]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_SignificantAccountingPoliciesTextBlock" xml:lang="en-US">Summary of Significant Accounting Policies</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_us-gaap_SignificantAccountingPoliciesTextBlock" xlink:to="lab_6519M744M9881LH5IK5L_us-gaap_SignificantAccountingPoliciesTextBlock"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract" xlink:label="loc_79JGG6F7FFFI_us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract" xml:lang="en-US">Stockholders' Equity [Abstract]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract" xml:lang="en-US">Stockholders' Equity</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract" xlink:to="lab_91LII8H9HHHK_us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StockholdersEquityNoteDisclosureTextBlock" xlink:label="loc_4397K522K7669JF3GI3J_us-gaap_StockholdersEquityNoteDisclosureTextBlock" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_StockholdersEquityNoteDisclosureTextBlock" xml:lang="en-US">Stockholders' Equity Note Disclosure [Text Block]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_StockholdersEquityNoteDisclosureTextBlock" xml:lang="en-US">Stockholders' Equity</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_us-gaap_StockholdersEquityNoteDisclosureTextBlock" xlink:to="lab_6519M744M9881LH5IK5L_us-gaap_StockholdersEquityNoteDisclosureTextBlock"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ExtractiveIndustriesAbstract" xlink:label="loc_79JGG6F7FFFI_us-gaap_ExtractiveIndustriesAbstract" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_us-gaap_ExtractiveIndustriesAbstract" xml:lang="en-US">Unproved Oil and Gas Properties, Full Cost Method [Abstract]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_ExtractiveIndustriesAbstract" xml:lang="en-US">Unproved Oil and Gas Properties, Full Cost Method</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_us-gaap_ExtractiveIndustriesAbstract" xlink:to="lab_91LII8H9HHHK_us-gaap_ExtractiveIndustriesAbstract"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OilAndGasExplorationAndProductionIndustriesDisclosuresTextBlock" xlink:label="loc_4397K522K7669JF3GI3J_us-gaap_OilAndGasExplorationAndProductionIndustriesDisclosuresTextBlock" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_OilAndGasExplorationAndProductionIndustriesDisclosuresTextBlock" xml:lang="en-US">Oil and Gas Exploration and Production Industries Disclosures [Text Block]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_OilAndGasExplorationAndProductionIndustriesDisclosuresTextBlock" xml:lang="en-US">Unproved Oil and Gas Properties, Full Cost Method</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_us-gaap_OilAndGasExplorationAndProductionIndustriesDisclosuresTextBlock" xlink:to="lab_6519M744M9881LH5IK5L_us-gaap_OilAndGasExplorationAndProductionIndustriesDisclosuresTextBlock"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CommitmentsAndContingenciesDisclosureAbstract" xlink:label="loc_79JGG6F7FFFI_us-gaap_CommitmentsAndContingenciesDisclosureAbstract" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_us-gaap_CommitmentsAndContingenciesDisclosureAbstract" xml:lang="en-US">Commitments and Contingencies [Abstract]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_CommitmentsAndContingenciesDisclosureAbstract" xml:lang="en-US">Commitments and Contingencies</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_us-gaap_CommitmentsAndContingenciesDisclosureAbstract" xlink:to="lab_91LII8H9HHHK_us-gaap_CommitmentsAndContingenciesDisclosureAbstract"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CommitmentsAndContingenciesDisclosureTextBlock" xlink:label="loc_4397K522K7669JF3GI3J_us-gaap_CommitmentsAndContingenciesDisclosureTextBlock" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_CommitmentsAndContingenciesDisclosureTextBlock" xml:lang="en-US">Commitments and Contingencies Disclosure [Text Block]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_CommitmentsAndContingenciesDisclosureTextBlock" xml:lang="en-US">Commitments and Contingencies</label>
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<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SubsequentEventsAbstract" xlink:label="loc_79JGG6F7FFFI_us-gaap_SubsequentEventsAbstract" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_us-gaap_SubsequentEventsAbstract" xml:lang="en-US">Subsequent Events [Abstract]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_us-gaap_SubsequentEventsAbstract" xlink:to="lab_91LII8H9HHHK_us-gaap_SubsequentEventsAbstract"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SubsequentEventsTextBlock" xlink:label="loc_4397K522K7669JF3GI3J_us-gaap_SubsequentEventsTextBlock" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_SubsequentEventsTextBlock" xml:lang="en-US">Subsequent Events [Text Block]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_SubsequentEventsTextBlock" xml:lang="en-US">Subsequent Events</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_us-gaap_SubsequentEventsTextBlock" xlink:to="lab_6519M744M9881LH5IK5L_us-gaap_SubsequentEventsTextBlock"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EarningsPerSharePolicyTextBlock" xlink:label="loc_79JGG6F7FFFI_us-gaap_EarningsPerSharePolicyTextBlock" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_us-gaap_EarningsPerSharePolicyTextBlock" xml:lang="en-US">Earnings Per Share, Policy [Policy Text Block]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_EarningsPerSharePolicyTextBlock" xml:lang="en-US">Net Loss per Share Data</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_us-gaap_EarningsPerSharePolicyTextBlock" xlink:to="lab_91LII8H9HHHK_us-gaap_EarningsPerSharePolicyTextBlock"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_UseOfEstimates" xlink:label="loc_4397K522K7669JF3GI3J_us-gaap_UseOfEstimates" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_UseOfEstimates" xml:lang="en-US">Use of Estimates, Policy [Policy Text Block]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_UseOfEstimates" xml:lang="en-US">Use of Estimates</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_us-gaap_UseOfEstimates" xlink:to="lab_6519M744M9881LH5IK5L_us-gaap_UseOfEstimates"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OilAndGasPropertiesPolicyPolicyTextBlock" xlink:label="loc_79JGG6F7FFFI_us-gaap_OilAndGasPropertiesPolicyPolicyTextBlock" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_us-gaap_OilAndGasPropertiesPolicyPolicyTextBlock" xml:lang="en-US">Oil and Gas Properties Policy [Policy Text Block]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_OilAndGasPropertiesPolicyPolicyTextBlock" xml:lang="en-US">Oil and Gas Properties and Impairment</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_us-gaap_OilAndGasPropertiesPolicyPolicyTextBlock" xlink:to="lab_91LII8H9HHHK_us-gaap_OilAndGasPropertiesPolicyPolicyTextBlock"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="loc_4397K522K7669JF3GI3J_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xml:lang="en-US">Schedule Of Share Based Compensation Arrangements By Share Based Payment Award [Table]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xml:lang="en-US">Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:to="lab_6519M744M9881LH5IK5L_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_TitleOfIndividualAxis" xlink:label="loc_79JGG6F7FFFI_us-gaap_TitleOfIndividualAxis" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_us-gaap_TitleOfIndividualAxis" xml:lang="en-US">Title of Individual [Axis]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_us-gaap_TitleOfIndividualAxis" xlink:to="lab_91LII8H9HHHK_us-gaap_TitleOfIndividualAxis"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_TitleOfIndividualWithRelationshipToEntityDomain" xlink:label="loc_4397K522K7669JF3GI3J_us-gaap_TitleOfIndividualWithRelationshipToEntityDomain" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_TitleOfIndividualWithRelationshipToEntityDomain" xml:lang="en-US">Title Of Individual With Relationship To Entity [Domain]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_TitleOfIndividualWithRelationshipToEntityDomain" xml:lang="en-US">Title of Individual with Relationship to Entity [Domain]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_us-gaap_TitleOfIndividualWithRelationshipToEntityDomain" xlink:to="lab_6519M744M9881LH5IK5L_us-gaap_TitleOfIndividualWithRelationshipToEntityDomain"/>
<loc xlink:type="locator" xlink:href="zn-20130930.xsd#zn_NonEmployeeMember" xlink:label="loc_79JGG6F7FFFI_zn_NonEmployeeMember" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_zn_NonEmployeeMember" xml:lang="en-US">Non Employee [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_zn_NonEmployeeMember" xml:lang="en-US">Non Employee [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_91LII8H9HHHK_zn_NonEmployeeMember" xml:lang="en-US">Non Employee [Member]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_zn_NonEmployeeMember" xlink:to="lab_91LII8H9HHHK_zn_NonEmployeeMember"/>
<loc xlink:type="locator" xlink:href="zn-20130930.xsd#zn_EmployeesAndDirectorsMember" xlink:label="loc_4397K522K7669JF3GI3J_zn_EmployeesAndDirectorsMember" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_zn_EmployeesAndDirectorsMember" xml:lang="en-US">Employees And Directors [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_zn_EmployeesAndDirectorsMember" xml:lang="en-US">Employees and Directors [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_6519M744M9881LH5IK5L_zn_EmployeesAndDirectorsMember" xml:lang="en-US">Employees and Directors [Member]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_zn_EmployeesAndDirectorsMember" xlink:to="lab_6519M744M9881LH5IK5L_zn_EmployeesAndDirectorsMember"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="loc_79JGG6F7FFFI_us-gaap_AwardTypeAxis" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_us-gaap_AwardTypeAxis" xml:lang="en-US">Award Type [Axis]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_AwardTypeAxis" xml:lang="en-US">Award Type [Axis]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_us-gaap_AwardTypeAxis" xlink:to="lab_91LII8H9HHHK_us-gaap_AwardTypeAxis"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_4397K522K7669JF3GI3J_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xml:lang="en-US">Share Based Compensation Arrangements By Share Based Payment Award Award Type And Plan Name [Domain]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xml:lang="en-US">Award Type [Domain]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:to="lab_6519M744M9881LH5IK5L_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EmployeeStockOptionMember" xlink:label="loc_79JGG6F7FFFI_us-gaap_EmployeeStockOptionMember" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_us-gaap_EmployeeStockOptionMember" xml:lang="en-US">Employee Stock Option [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_EmployeeStockOptionMember" xml:lang="en-US">Stock Options [Member]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_us-gaap_EmployeeStockOptionMember" xlink:to="lab_91LII8H9HHHK_us-gaap_EmployeeStockOptionMember"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_WarrantMember" xlink:label="loc_4397K522K7669JF3GI3J_us-gaap_WarrantMember" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_WarrantMember" xml:lang="en-US">Warrant [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_WarrantMember" xml:lang="en-US">Warrant [Member]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_us-gaap_WarrantMember" xlink:to="lab_6519M744M9881LH5IK5L_us-gaap_WarrantMember"/>
<loc xlink:type="locator" xlink:href="zn-20130930.xsd#zn_WarrantsAndOptionsMember" xlink:label="loc_79JGG6F7FFFI_zn_WarrantsAndOptionsMember" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_zn_WarrantsAndOptionsMember" xml:lang="en-US">Warrants And Options [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_zn_WarrantsAndOptionsMember" xml:lang="en-US">Warrants and Options [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_91LII8H9HHHK_zn_WarrantsAndOptionsMember" xml:lang="en-US">Warrants And Options [Member].</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_zn_WarrantsAndOptionsMember" xlink:to="lab_91LII8H9HHHK_zn_WarrantsAndOptionsMember"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="loc_4397K522K7669JF3GI3J_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award [Line Items]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award [Line Items]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="lab_6519M744M9881LH5IK5L_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeTextBlock" xlink:label="loc_79JGG6F7FFFI_us-gaap_ScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeTextBlock" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_us-gaap_ScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeTextBlock" xml:lang="en-US">Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_ScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeTextBlock" xml:lang="en-US">Stock Warrants and Options Outstanding</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_us-gaap_ScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeTextBlock" xlink:to="lab_91LII8H9HHHK_us-gaap_ScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeTextBlock"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfUnrecognizedCompensationCostNonvestedAwardsTableTextBlock" xlink:label="loc_4397K522K7669JF3GI3J_us-gaap_ScheduleOfUnrecognizedCompensationCostNonvestedAwardsTableTextBlock" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_ScheduleOfUnrecognizedCompensationCostNonvestedAwardsTableTextBlock" xml:lang="en-US">Schedule of Unrecognized Compensation Cost, Nonvested Awards [Table Text Block]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_ScheduleOfUnrecognizedCompensationCostNonvestedAwardsTableTextBlock" xml:lang="en-US">Unrecognized Compensation Cost Expected to be Recognized</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_us-gaap_ScheduleOfUnrecognizedCompensationCostNonvestedAwardsTableTextBlock" xlink:to="lab_6519M744M9881LH5IK5L_us-gaap_ScheduleOfUnrecognizedCompensationCostNonvestedAwardsTableTextBlock"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock" xlink:label="loc_79JGG6F7FFFI_us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock" xml:lang="en-US">Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock" xml:lang="en-US">Stock Options Transactions</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock" xlink:to="lab_91LII8H9HHHK_us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock" xlink:label="loc_4397K522K7669JF3GI3J_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock" xml:lang="en-US">Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock" xml:lang="en-US">Compensation Cost of Warrant and Option Issuances Recognized</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock" xlink:to="lab_6519M744M9881LH5IK5L_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock" xlink:label="loc_79JGG6F7FFFI_us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock" xml:lang="en-US">Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock" xml:lang="en-US">Assumptions Used to Estimate Fair Value of Warrants Granted Using Black-Scholes Option Pricing Model</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock" xlink:to="lab_91LII8H9HHHK_us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfCapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationTextBlock" xlink:label="loc_4397K522K7669JF3GI3J_us-gaap_ScheduleOfCapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationTextBlock" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_ScheduleOfCapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationTextBlock" xml:lang="en-US">Schedule of Capitalized Costs of Unproved Properties Excluded from Amortization [Table Text Block]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_ScheduleOfCapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationTextBlock" xml:lang="en-US">Schedule of Unproved Oil and Gas Properties, Full Cost Method</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_us-gaap_ScheduleOfCapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationTextBlock" xlink:to="lab_6519M744M9881LH5IK5L_us-gaap_ScheduleOfCapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationTextBlock"/>
<loc xlink:type="locator" xlink:href="zn-20130930.xsd#zn_ScheduleOfImpairmentOfUnprovedPropertiesTableTextBlock" xlink:label="loc_79JGG6F7FFFI_zn_ScheduleOfImpairmentOfUnprovedPropertiesTableTextBlock" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_zn_ScheduleOfImpairmentOfUnprovedPropertiesTableTextBlock" xml:lang="en-US">Schedule Of Impairment Of Unproved Properties [Table Text Block]</label>
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<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_91LII8H9HHHK_zn_ScheduleOfImpairmentOfUnprovedPropertiesTableTextBlock" xml:lang="en-US">Schedule of impairment of unproved properties.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_zn_ScheduleOfImpairmentOfUnprovedPropertiesTableTextBlock" xlink:to="lab_91LII8H9HHHK_zn_ScheduleOfImpairmentOfUnprovedPropertiesTableTextBlock"/>
<loc xlink:type="locator" xlink:href="zn-20130930.xsd#zn_EntityHistoricalOilAndGasExplorationPeriod" xlink:label="loc_4397K522K7669JF3GI3J_zn_EntityHistoricalOilAndGasExplorationPeriod" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_zn_EntityHistoricalOilAndGasExplorationPeriod" xml:lang="en-US">Entity Historical Oil And Gas Exploration Period</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_zn_EntityHistoricalOilAndGasExplorationPeriod" xml:lang="en-US">Exploration period doing oil and gas</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_6519M744M9881LH5IK5L_zn_EntityHistoricalOilAndGasExplorationPeriod" xml:lang="en-US">The entity's historical period doing oil and gas exploration.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_zn_EntityHistoricalOilAndGasExplorationPeriod" xlink:to="lab_6519M744M9881LH5IK5L_zn_EntityHistoricalOilAndGasExplorationPeriod"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount" xlink:label="loc_79JGG6F7FFFI_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount" xml:lang="en-US">Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount" xml:lang="en-US">Common stock equivalents excluded from EPS as the inclusion would be anti-dilutive</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount" xlink:to="lab_91LII8H9HHHK_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount"/>
<loc xlink:type="locator" xlink:href="zn-20130930.xsd#zn_NonEmployeeDirectorMember" xlink:label="loc_4397K522K7669JF3GI3J_zn_NonEmployeeDirectorMember" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_zn_NonEmployeeDirectorMember" xml:lang="en-US">Non Employee Director [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_zn_NonEmployeeDirectorMember" xml:lang="en-US">Non Employee Director [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_6519M744M9881LH5IK5L_zn_NonEmployeeDirectorMember" xml:lang="en-US">Non Employee Director [Member]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_zn_NonEmployeeDirectorMember" xlink:to="lab_6519M744M9881LH5IK5L_zn_NonEmployeeDirectorMember"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ClassOfWarrantOrRightAxis" xlink:label="loc_79JGG6F7FFFI_us-gaap_ClassOfWarrantOrRightAxis" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_us-gaap_ClassOfWarrantOrRightAxis" xml:lang="en-US">Class of Warrant or Right [Axis]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_us-gaap_ClassOfWarrantOrRightAxis" xlink:to="lab_91LII8H9HHHK_us-gaap_ClassOfWarrantOrRightAxis"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ClassOfWarrantOrRightDomain" xlink:label="loc_4397K522K7669JF3GI3J_us-gaap_ClassOfWarrantOrRightDomain" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_ClassOfWarrantOrRightDomain" xml:lang="en-US">Class Of Warrant Or Right [Domain]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_ClassOfWarrantOrRightDomain" xml:lang="en-US">Class of Warrant or Right [Domain]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_us-gaap_ClassOfWarrantOrRightDomain" xlink:to="lab_6519M744M9881LH5IK5L_us-gaap_ClassOfWarrantOrRightDomain"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PlanNameAxis" xlink:label="loc_79JGG6F7FFFI_us-gaap_PlanNameAxis" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_us-gaap_PlanNameAxis" xml:lang="en-US">Plan Name [Axis]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_PlanNameAxis" xml:lang="en-US">Plan Name [Axis]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_us-gaap_PlanNameAxis" xlink:to="lab_91LII8H9HHHK_us-gaap_PlanNameAxis"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PlanNameDomain" xlink:label="loc_4397K522K7669JF3GI3J_us-gaap_PlanNameDomain" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_PlanNameDomain" xml:lang="en-US">Plan Name [Domain]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_PlanNameDomain" xml:lang="en-US">Plan Name [Domain]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_us-gaap_PlanNameDomain" xlink:to="lab_6519M744M9881LH5IK5L_us-gaap_PlanNameDomain"/>
<loc xlink:type="locator" xlink:href="zn-20130930.xsd#zn_StockOptionPlanTwentyElevenMember" xlink:label="loc_79JGG6F7FFFI_zn_StockOptionPlanTwentyElevenMember" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_zn_StockOptionPlanTwentyElevenMember" xml:lang="en-US">Stock Option Plan Twenty Eleven [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_zn_StockOptionPlanTwentyElevenMember" xml:lang="en-US">Stock Option Plan 2011 [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_91LII8H9HHHK_zn_StockOptionPlanTwentyElevenMember" xml:lang="en-US">Stock Option Plan 2011 [Member]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_zn_StockOptionPlanTwentyElevenMember" xlink:to="lab_91LII8H9HHHK_zn_StockOptionPlanTwentyElevenMember"/>
<loc xlink:type="locator" xlink:href="zn-20130930.xsd#zn_StockOptionPlanTwentyZeroFiveMember" xlink:label="loc_4397K522K7669JF3GI3J_zn_StockOptionPlanTwentyZeroFiveMember" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_zn_StockOptionPlanTwentyZeroFiveMember" xml:lang="en-US">Stock Option Plan Twenty Zero Five [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_zn_StockOptionPlanTwentyZeroFiveMember" xml:lang="en-US">Stock Option Plan 2005 [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_6519M744M9881LH5IK5L_zn_StockOptionPlanTwentyZeroFiveMember" xml:lang="en-US">Stock Option Plan 2005 [Member].</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_zn_StockOptionPlanTwentyZeroFiveMember" xlink:to="lab_6519M744M9881LH5IK5L_zn_StockOptionPlanTwentyZeroFiveMember"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AwardDateAxis" xlink:label="loc_79JGG6F7FFFI_us-gaap_AwardDateAxis" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_us-gaap_AwardDateAxis" xml:lang="en-US">Award Date [Axis]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_us-gaap_AwardDateAxis" xlink:to="lab_91LII8H9HHHK_us-gaap_AwardDateAxis"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AwardDateDomain" xlink:label="loc_4397K522K7669JF3GI3J_us-gaap_AwardDateDomain" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_AwardDateDomain" xml:lang="en-US">Award Date [Domain]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_us-gaap_AwardDateDomain" xlink:to="lab_6519M744M9881LH5IK5L_us-gaap_AwardDateDomain"/>
<loc xlink:type="locator" xlink:href="zn-20130930.xsd#zn_ExercisableThroughJanuaryNineTwoZeroOneNineMember" xlink:label="loc_79JGG6F7FFFI_zn_ExercisableThroughJanuaryNineTwoZeroOneNineMember" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_zn_ExercisableThroughJanuaryNineTwoZeroOneNineMember" xml:lang="en-US">Exercisable Through January Nine Two Zero One Nine [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_91LII8H9HHHK_zn_ExercisableThroughJanuaryNineTwoZeroOneNineMember" xml:lang="en-US">January 9, 2019 [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_91LII8H9HHHK_zn_ExercisableThroughJanuaryNineTwoZeroOneNineMember" xml:lang="en-US">Exercisable through january nine two zero one nine.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_zn_ExercisableThroughJanuaryNineTwoZeroOneNineMember" xlink:to="lab_91LII8H9HHHK_zn_ExercisableThroughJanuaryNineTwoZeroOneNineMember"/>
<loc xlink:type="locator" xlink:href="zn-20130930.xsd#zn_ExercisableThroughJulyTenTwoZeroOneNineMember" xlink:label="loc_4397K522K7669JF3GI3J_zn_ExercisableThroughJulyTenTwoZeroOneNineMember" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_zn_ExercisableThroughJulyTenTwoZeroOneNineMember" xml:lang="en-US">Exercisable Through July Ten Two Zero One Nine [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_zn_ExercisableThroughJulyTenTwoZeroOneNineMember" xml:lang="en-US">July 10, 2019 [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_6519M744M9881LH5IK5L_zn_ExercisableThroughJulyTenTwoZeroOneNineMember" xml:lang="en-US">Exercisable through july ten two zero one nine.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_zn_ExercisableThroughJulyTenTwoZeroOneNineMember" xlink:to="lab_6519M744M9881LH5IK5L_zn_ExercisableThroughJulyTenTwoZeroOneNineMember"/>
<loc xlink:type="locator" xlink:href="zn-20130930.xsd#zn_ExercisableThroughSeptemberThreeTwoZeroOneNineMember" xlink:label="loc_79JGG6F7FFFI_zn_ExercisableThroughSeptemberThreeTwoZeroOneNineMember" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_zn_ExercisableThroughSeptemberThreeTwoZeroOneNineMember" xml:lang="en-US">Exercisable Through September Three Two Zero One Nine [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_zn_ExercisableThroughSeptemberThreeTwoZeroOneNineMember" xml:lang="en-US">September 3, 2019 [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_91LII8H9HHHK_zn_ExercisableThroughSeptemberThreeTwoZeroOneNineMember" xml:lang="en-US">Exercisable through september three two zero one nine.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_zn_ExercisableThroughSeptemberThreeTwoZeroOneNineMember" xlink:to="lab_91LII8H9HHHK_zn_ExercisableThroughSeptemberThreeTwoZeroOneNineMember"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights" xlink:label="loc_4397K522K7669JF3GI3J_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights" xml:lang="en-US">Class Of Warrant Or Right Exercise Price Of Warrants Or Rights</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights" xml:lang="en-US">Warrant exercise price</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights" xml:lang="en-US">Equity instrument exercise price</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights" xlink:to="lab_6519M744M9881LH5IK5L_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights"/>
<loc xlink:type="locator" xlink:href="zn-20130930.xsd#zn_ClassOfWarrantOrRightExercisePeriod" xlink:label="loc_79JGG6F7FFFI_zn_ClassOfWarrantOrRightExercisePeriod" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_zn_ClassOfWarrantOrRightExercisePeriod" xml:lang="en-US">Class Of Warrant Or Right Exercise Period</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_zn_ClassOfWarrantOrRightExercisePeriod" xml:lang="en-US">Equity instrument exercise period</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_91LII8H9HHHK_zn_ClassOfWarrantOrRightExercisePeriod" xml:lang="en-US">Class of warrant or right exercise period.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_zn_ClassOfWarrantOrRightExercisePeriod" xlink:to="lab_91LII8H9HHHK_zn_ClassOfWarrantOrRightExercisePeriod"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod" xlink:label="loc_4397K522K7669JF3GI3J_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod" xml:lang="en-US">Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod" xml:lang="en-US">Granted</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod" xml:lang="en-US">Stock option plan, award to purchase common stock</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures, Total</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod" xlink:to="lab_6519M744M9881LH5IK5L_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice" xlink:label="loc_79JGG6F7FFFI_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice" xml:lang="en-US">Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice" xml:lang="en-US">Granted</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice" xml:lang="en-US">Stock option plans, award to purchase common stock, exercise price</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice" xlink:to="lab_91LII8H9HHHK_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice"/>
<loc xlink:type="locator" xlink:href="zn-20130930.xsd#zn_ShareBasedCompensationArrangementBySharebasedPaymentAwardOptionsGrantsInPeriodGrantDateFairValue" xlink:label="loc_4397K522K7669JF3GI3J_zn_ShareBasedCompensationArrangementBySharebasedPaymentAwardOptionsGrantsInPeriodGrantDateFairValue" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_zn_ShareBasedCompensationArrangementBySharebasedPaymentAwardOptionsGrantsInPeriodGrantDateFairValue" xml:lang="en-US">Share Based Compensation Arrangement By Sharebased Payment Award Options Grants In Period Grant Date Fair Value</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_zn_ShareBasedCompensationArrangementBySharebasedPaymentAwardOptionsGrantsInPeriodGrantDateFairValue" xml:lang="en-US">Stock options granted, fair value on dates of grant</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_6519M744M9881LH5IK5L_zn_ShareBasedCompensationArrangementBySharebasedPaymentAwardOptionsGrantsInPeriodGrantDateFairValue" xml:lang="en-US">Share Based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Grant Date Fair Value</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_zn_ShareBasedCompensationArrangementBySharebasedPaymentAwardOptionsGrantsInPeriodGrantDateFairValue" xlink:to="lab_6519M744M9881LH5IK5L_zn_ShareBasedCompensationArrangementBySharebasedPaymentAwardOptionsGrantsInPeriodGrantDateFairValue"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized" xlink:label="loc_79JGG6F7FFFI_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized" xml:lang="en-US">Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized" xml:lang="en-US">Unrecognized compensation cost related to non vested stock</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized" xml:lang="en-US">Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Total</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized" xlink:to="lab_91LII8H9HHHK_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized"/>
<loc xlink:type="locator" xlink:href="zn-20130930.xsd#zn_EmployeesAndOfficersAndDirectorsMember" xlink:label="loc_4397K522K7669JF3GI3J_zn_EmployeesAndOfficersAndDirectorsMember" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_zn_EmployeesAndOfficersAndDirectorsMember" xml:lang="en-US">Employees And Officers And Directors [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_zn_EmployeesAndOfficersAndDirectorsMember" xml:lang="en-US">Employees, Officers and Directors [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_6519M744M9881LH5IK5L_zn_EmployeesAndOfficersAndDirectorsMember" xml:lang="en-US">Employees And Officers And Directors [Member].</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_zn_EmployeesAndOfficersAndDirectorsMember" xlink:to="lab_6519M744M9881LH5IK5L_zn_EmployeesAndOfficersAndDirectorsMember"/>
<loc xlink:type="locator" xlink:href="zn-20130930.xsd#zn_InvestorsMember" xlink:label="loc_79JGG6F7FFFI_zn_InvestorsMember" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_zn_InvestorsMember" xml:lang="en-US">Investors [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_zn_InvestorsMember" xml:lang="en-US">Investors [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_91LII8H9HHHK_zn_InvestorsMember" xml:lang="en-US">Investor [Member].</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_zn_InvestorsMember" xlink:to="lab_91LII8H9HHHK_zn_InvestorsMember"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward" xlink:label="loc_4397K522K7669JF3GI3J_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward" xml:lang="en-US">Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding [Roll Forward]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward" xml:lang="en-US">Number of shares</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward" xlink:to="lab_6519M744M9881LH5IK5L_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber" xlink:label="loc_79JGG6F7FFFI_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber" xml:lang="en-US">Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber" xml:lang="en-US">Number of Shares</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber" xml:lang="en-US">Outstanding, December 31, 2012</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber" xml:lang="en-US">Outstanding, September 30, 2013</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber" xlink:to="lab_91LII8H9HHHK_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod" xlink:label="loc_4397K522K7669JF3GI3J_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod" xml:lang="en-US">Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod" xml:lang="en-US">Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Total</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod" xml:lang="en-US">Expired/Cancelled/Forfeited</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod" xlink:to="lab_6519M744M9881LH5IK5L_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber" xlink:label="loc_79JGG6F7FFFI_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber" xml:lang="en-US">Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber" xml:lang="en-US">Exercisable, September 30, 2013</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber" xml:lang="en-US">Stock options exercisable, shares</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber" xlink:to="lab_91LII8H9HHHK_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber"/>
<loc xlink:type="locator" xlink:href="zn-20130930.xsd#zn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsWeightedAverageExercisePriceAbstract" xlink:label="loc_4397K522K7669JF3GI3J_zn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsWeightedAverageExercisePriceAbstract" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_zn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsWeightedAverageExercisePriceAbstract" xml:lang="en-US">Share Based Compensation Arrangement By Share Based Payment Award Options Weighted Average Exercise Price [Abstract]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_zn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsWeightedAverageExercisePriceAbstract" xml:lang="en-US">Weighted average exercise price</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_6519M744M9881LH5IK5L_zn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsWeightedAverageExercisePriceAbstract" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Options, Weighted Average Exercise Price [Abstract]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_zn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsWeightedAverageExercisePriceAbstract" xlink:to="lab_6519M744M9881LH5IK5L_zn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsWeightedAverageExercisePriceAbstract"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice" xlink:label="loc_79JGG6F7FFFI_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice" xml:lang="en-US">Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice" xml:lang="en-US">Shares underlying outstanding warrants and options Weighted Average Exercise price</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice" xml:lang="en-US">Exercise price</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice" xml:lang="en-US">Outstanding, December 31, 2012</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice" xml:lang="en-US">Outstanding, September 30, 2013</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice" xlink:to="lab_91LII8H9HHHK_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice" xlink:label="loc_4397K522K7669JF3GI3J_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice" xml:lang="en-US">Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period Weighted Average Exercise Price</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice" xml:lang="en-US">Expired/Cancelled/Forfeited</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price, Total</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice" xlink:to="lab_6519M744M9881LH5IK5L_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice" xlink:label="loc_79JGG6F7FFFI_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice" xml:lang="en-US">Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice" xml:lang="en-US">Exercised</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice" xlink:to="lab_91LII8H9HHHK_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice" xlink:label="loc_4397K522K7669JF3GI3J_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice" xml:lang="en-US">Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice" xml:lang="en-US">Exercisable, September 30, 2013</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice" xml:lang="en-US">Stock option plan, exercise price</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice" xlink:to="lab_6519M744M9881LH5IK5L_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeTable" xlink:label="loc_79JGG6F7FFFI_us-gaap_ScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeTable" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_us-gaap_ScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeTable" xml:lang="en-US">Schedule Of Share Based Compensation Shares Authorized Under Stock Option Plans By Exercise Price Range [Table]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_ScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeTable" xml:lang="en-US">Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_us-gaap_ScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeTable" xlink:to="lab_91LII8H9HHHK_us-gaap_ScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeTable"/>
<loc xlink:type="locator" xlink:href="zn-20130930.xsd#zn_UnvestedMember" xlink:label="loc_4397K522K7669JF3GI3J_zn_UnvestedMember" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_zn_UnvestedMember" xml:lang="en-US">Unvested [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_zn_UnvestedMember" xml:lang="en-US">Unvested [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_6519M744M9881LH5IK5L_zn_UnvestedMember" xml:lang="en-US">Unvested [Member]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_zn_UnvestedMember" xlink:to="lab_6519M744M9881LH5IK5L_zn_UnvestedMember"/>
<loc xlink:type="locator" xlink:href="zn-20130930.xsd#zn_VestedMember" xlink:label="loc_79JGG6F7FFFI_zn_VestedMember" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_zn_VestedMember" xml:lang="en-US">Vested [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_zn_VestedMember" xml:lang="en-US">Vested [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_91LII8H9HHHK_zn_VestedMember" xml:lang="en-US">Vested [Member]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_zn_VestedMember" xlink:to="lab_91LII8H9HHHK_zn_VestedMember"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis" xlink:label="loc_4397K522K7669JF3GI3J_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis" xml:lang="en-US">Share Based Compensation Shares Authorized Under Stock Option Plans By Exercise Price Range [Axis]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis" xml:lang="en-US">Exercise Price Range [Axis]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis" xlink:to="lab_6519M744M9881LH5IK5L_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain" xlink:label="loc_79JGG6F7FFFI_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain" xml:lang="en-US">Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Domain]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain" xml:lang="en-US">Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Domain]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain" xlink:to="lab_91LII8H9HHHK_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain"/>
<loc xlink:type="locator" xlink:href="zn-20130930.xsd#zn_RangeOneMember" xlink:label="loc_4397K522K7669JF3GI3J_zn_RangeOneMember" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_zn_RangeOneMember" xml:lang="en-US">Range One [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_zn_RangeOneMember" xml:lang="en-US">Range Exercise Price 1.70 First [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_6519M744M9881LH5IK5L_zn_RangeOneMember" xml:lang="en-US">Range One [Member]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_zn_RangeOneMember" xlink:to="lab_6519M744M9881LH5IK5L_zn_RangeOneMember"/>
<loc xlink:type="locator" xlink:href="zn-20130930.xsd#zn_RangeTwoMember" xlink:label="loc_79JGG6F7FFFI_zn_RangeTwoMember" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_zn_RangeTwoMember" xml:lang="en-US">Range Two [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_zn_RangeTwoMember" xml:lang="en-US">Range Exercise Price 1.70 Second [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_91LII8H9HHHK_zn_RangeTwoMember" xml:lang="en-US">Range Two [Member]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_zn_RangeTwoMember" xlink:to="lab_91LII8H9HHHK_zn_RangeTwoMember"/>
<loc xlink:type="locator" xlink:href="zn-20130930.xsd#zn_RangeFourteenMember" xlink:label="loc_4397K522K7669JF3GI3J_zn_RangeFourteenMember" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_zn_RangeFourteenMember" xml:lang="en-US">Range Fourteen [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_zn_RangeFourteenMember" xml:lang="en-US">Range Exercise Price 0.01 First [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_6519M744M9881LH5IK5L_zn_RangeFourteenMember" xml:lang="en-US">Range 14 [Member]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_zn_RangeFourteenMember" xlink:to="lab_6519M744M9881LH5IK5L_zn_RangeFourteenMember"/>
<loc xlink:type="locator" xlink:href="zn-20130930.xsd#zn_RangeFifteenMember" xlink:label="loc_79JGG6F7FFFI_zn_RangeFifteenMember" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_zn_RangeFifteenMember" xml:lang="en-US">Range Fifteen [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_zn_RangeFifteenMember" xml:lang="en-US">Range Exercise Price 2.61 First [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_91LII8H9HHHK_zn_RangeFifteenMember" xml:lang="en-US">Range Fifteen [Member].</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_zn_RangeFifteenMember" xlink:to="lab_91LII8H9HHHK_zn_RangeFifteenMember"/>
<loc xlink:type="locator" xlink:href="zn-20130930.xsd#zn_RangeThreeMember" xlink:label="loc_4397K522K7669JF3GI3J_zn_RangeThreeMember" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_zn_RangeThreeMember" xml:lang="en-US">Range Three [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_zn_RangeThreeMember" xml:lang="en-US">Range Exercise Price 2.61 Second [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_6519M744M9881LH5IK5L_zn_RangeThreeMember" xml:lang="en-US">Range Three [Member]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_zn_RangeThreeMember" xlink:to="lab_6519M744M9881LH5IK5L_zn_RangeThreeMember"/>
<loc xlink:type="locator" xlink:href="zn-20130930.xsd#zn_RangeSevenMember" xlink:label="loc_79JGG6F7FFFI_zn_RangeSevenMember" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_zn_RangeSevenMember" xml:lang="en-US">Range Seven [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_zn_RangeSevenMember" xml:lang="en-US">Range Exercise Price 4.55 [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_91LII8H9HHHK_zn_RangeSevenMember" xml:lang="en-US">Range Seven [Member]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_zn_RangeSevenMember" xlink:to="lab_91LII8H9HHHK_zn_RangeSevenMember"/>
<loc xlink:type="locator" xlink:href="zn-20130930.xsd#zn_RangeSeventeenMember" xlink:label="loc_4397K522K7669JF3GI3J_zn_RangeSeventeenMember" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_zn_RangeSeventeenMember" xml:lang="en-US">Range Seventeen [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_zn_RangeSeventeenMember" xml:lang="en-US">Range Exercise Price 1.86 [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_6519M744M9881LH5IK5L_zn_RangeSeventeenMember" xml:lang="en-US">Range Seventeen [Member].</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_zn_RangeSeventeenMember" xlink:to="lab_6519M744M9881LH5IK5L_zn_RangeSeventeenMember"/>
<loc xlink:type="locator" xlink:href="zn-20130930.xsd#zn_RangeNineMember" xlink:label="loc_79JGG6F7FFFI_zn_RangeNineMember" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_zn_RangeNineMember" xml:lang="en-US">Range Nine [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_zn_RangeNineMember" xml:lang="en-US">Range Exercise Price 7.15 [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_91LII8H9HHHK_zn_RangeNineMember" xml:lang="en-US">Range Nine [Member]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_zn_RangeNineMember" xlink:to="lab_91LII8H9HHHK_zn_RangeNineMember"/>
<loc xlink:type="locator" xlink:href="zn-20130930.xsd#zn_RangeTenMember" xlink:label="loc_4397K522K7669JF3GI3J_zn_RangeTenMember" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_zn_RangeTenMember" xml:lang="en-US">Range Ten [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_zn_RangeTenMember" xml:lang="en-US">Range Exercise Price 4.45 [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_6519M744M9881LH5IK5L_zn_RangeTenMember" xml:lang="en-US">Range Ten [Member]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_zn_RangeTenMember" xlink:to="lab_6519M744M9881LH5IK5L_zn_RangeTenMember"/>
<loc xlink:type="locator" xlink:href="zn-20130930.xsd#zn_RangeElevenMember" xlink:label="loc_79JGG6F7FFFI_zn_RangeElevenMember" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_zn_RangeElevenMember" xml:lang="en-US">Range Eleven [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_zn_RangeElevenMember" xml:lang="en-US">Range Exercise Price 2.50 [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_91LII8H9HHHK_zn_RangeElevenMember" xml:lang="en-US">Range 11 [Member]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_zn_RangeElevenMember" xlink:to="lab_91LII8H9HHHK_zn_RangeElevenMember"/>
<loc xlink:type="locator" xlink:href="zn-20130930.xsd#zn_RangeFourMember" xlink:label="loc_4397K522K7669JF3GI3J_zn_RangeFourMember" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_zn_RangeFourMember" xml:lang="en-US">Range Four [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_zn_RangeFourMember" xml:lang="en-US">Range Exercise Price 0.01 Second [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_6519M744M9881LH5IK5L_zn_RangeFourMember" xml:lang="en-US">Range Four [Member]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_zn_RangeFourMember" xlink:to="lab_6519M744M9881LH5IK5L_zn_RangeFourMember"/>
<loc xlink:type="locator" xlink:href="zn-20130930.xsd#zn_RangeTwelveMember" xlink:label="loc_79JGG6F7FFFI_zn_RangeTwelveMember" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_zn_RangeTwelveMember" xml:lang="en-US">Range Twelve [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_zn_RangeTwelveMember" xml:lang="en-US">Range Exercise Price 2.28 [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_91LII8H9HHHK_zn_RangeTwelveMember" xml:lang="en-US">Range 12 [Member]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_zn_RangeTwelveMember" xlink:to="lab_91LII8H9HHHK_zn_RangeTwelveMember"/>
<loc xlink:type="locator" xlink:href="zn-20130930.xsd#zn_RangeEighteenMember" xlink:label="loc_4397K522K7669JF3GI3J_zn_RangeEighteenMember" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_zn_RangeEighteenMember" xml:lang="en-US">Range Eighteen [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_zn_RangeEighteenMember" xml:lang="en-US">Range Exercise Price 1.73 [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_6519M744M9881LH5IK5L_zn_RangeEighteenMember" xml:lang="en-US">Range Eighteen [Member].</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_zn_RangeEighteenMember" xlink:to="lab_6519M744M9881LH5IK5L_zn_RangeEighteenMember"/>
<loc xlink:type="locator" xlink:href="zn-20130930.xsd#zn_RangeSixteenMember" xlink:label="loc_79JGG6F7FFFI_zn_RangeSixteenMember" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_zn_RangeSixteenMember" xml:lang="en-US">Range Sixteen [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_zn_RangeSixteenMember" xml:lang="en-US">Range Exercise Price 1.96 [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_91LII8H9HHHK_zn_RangeSixteenMember" xml:lang="en-US">Range sixteen.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_zn_RangeSixteenMember" xlink:to="lab_91LII8H9HHHK_zn_RangeSixteenMember"/>
<loc xlink:type="locator" xlink:href="zn-20130930.xsd#zn_RangeThirteenMember" xlink:label="loc_4397K522K7669JF3GI3J_zn_RangeThirteenMember" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_zn_RangeThirteenMember" xml:lang="en-US">Range Thirteen [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_zn_RangeThirteenMember" xml:lang="en-US">Range Exercise Price 1.82 [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_6519M744M9881LH5IK5L_zn_RangeThirteenMember" xml:lang="en-US">Range 13 [Member]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_zn_RangeThirteenMember" xlink:to="lab_6519M744M9881LH5IK5L_zn_RangeThirteenMember"/>
<loc xlink:type="locator" xlink:href="zn-20130930.xsd#zn_RangeNineteenMember" xlink:label="loc_79JGG6F7FFFI_zn_RangeNineteenMember" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_zn_RangeNineteenMember" xml:lang="en-US">Range Nineteen [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_zn_RangeNineteenMember" xml:lang="en-US">Range Exercise Price 2.00 [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_91LII8H9HHHK_zn_RangeNineteenMember" xml:lang="en-US">Range Nineteen [Member].</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_zn_RangeNineteenMember" xlink:to="lab_91LII8H9HHHK_zn_RangeNineteenMember"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItems" xlink:label="loc_4397K522K7669JF3GI3J_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItems" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItems" xml:lang="en-US">Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItems" xml:lang="en-US">Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItems" xlink:to="lab_6519M744M9881LH5IK5L_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItems"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit" xlink:label="loc_79JGG6F7FFFI_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit" xml:lang="en-US">Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Lower Range Limit</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit" xml:lang="en-US">Shares underlying outstanding warrants and options Range of exercise price, lower range</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit" xlink:to="lab_91LII8H9HHHK_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit" xlink:label="loc_4397K522K7669JF3GI3J_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit" />
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<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit" xml:lang="en-US">Shares underlying outstanding warrants and options Range of exercise price, upper range</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit" xlink:to="lab_6519M744M9881LH5IK5L_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions" xlink:label="loc_79JGG6F7FFFI_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions" xml:lang="en-US">Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Number Of Outstanding Options</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions" xml:lang="en-US">Shares underlying outstanding warrants and options Number outstanding</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions" xml:lang="en-US">Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Outstanding Options, Beginning Balance</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions" xml:lang="en-US">Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Outstanding Options, Ending Balance</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions" xlink:to="lab_91LII8H9HHHK_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageRemainingContractualTerm2" xlink:label="loc_4397K522K7669JF3GI3J_us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageRemainingContractualTerm2" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageRemainingContractualTerm2" xml:lang="en-US">Sharebased Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Outstanding Options Weighted Average Remaining Contractual Term 2</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageRemainingContractualTerm2" xml:lang="en-US">Shares underlying outstanding warrants and options Weighted average remaining contractual life (years)</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageRemainingContractualTerm2" xlink:to="lab_6519M744M9881LH5IK5L_us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageRemainingContractualTerm2"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RangeAxis" xlink:label="loc_79JGG6F7FFFI_us-gaap_RangeAxis" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_us-gaap_RangeAxis" xml:lang="en-US">Range [Axis]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_RangeAxis" xml:lang="en-US">Range [Axis]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_us-gaap_RangeAxis" xlink:to="lab_91LII8H9HHHK_us-gaap_RangeAxis"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_4397K522K7669JF3GI3J_us-gaap_RangeMember" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_RangeMember" xml:lang="en-US">Range [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_RangeMember" xml:lang="en-US">Range [Domain]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_us-gaap_RangeMember" xlink:to="lab_6519M744M9881LH5IK5L_us-gaap_RangeMember"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MinimumMember" xlink:label="loc_79JGG6F7FFFI_us-gaap_MinimumMember" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_us-gaap_MinimumMember" xml:lang="en-US">Minimum [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_MinimumMember" xml:lang="en-US">Minimum [Member]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_us-gaap_MinimumMember" xlink:to="lab_91LII8H9HHHK_us-gaap_MinimumMember"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MaximumMember" xlink:label="loc_4397K522K7669JF3GI3J_us-gaap_MaximumMember" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_MaximumMember" xml:lang="en-US">Maximum [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_MaximumMember" xml:lang="en-US">Maximum [Member]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_us-gaap_MaximumMember" xlink:to="lab_6519M744M9881LH5IK5L_us-gaap_MaximumMember"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGrantDateIntrinsicValue" xlink:label="loc_79JGG6F7FFFI_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGrantDateIntrinsicValue" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGrantDateIntrinsicValue" xml:lang="en-US">Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Grant Date Intrinsic Value</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGrantDateIntrinsicValue" xml:lang="en-US">Weighted-average fair value of underlying stock at grant date</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGrantDateIntrinsicValue" xlink:to="lab_91LII8H9HHHK_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGrantDateIntrinsicValue"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate" xlink:label="loc_4397K522K7669JF3GI3J_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate" xml:lang="en-US">Dividend yields</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate" xlink:to="lab_6519M744M9881LH5IK5L_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum" xlink:label="loc_79JGG6F7FFFI_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum" xml:lang="en-US">Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate Minimum</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum" xml:lang="en-US">Expected volatility, minimum</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum" xlink:to="lab_91LII8H9HHHK_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum" xlink:label="loc_4397K522K7669JF3GI3J_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum" xml:lang="en-US">Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate Maximum</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum" xml:lang="en-US">Expected volatility, maximum</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum" xlink:to="lab_6519M744M9881LH5IK5L_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate" xlink:label="loc_79JGG6F7FFFI_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate" xml:lang="en-US">Expected volatility</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate" xlink:to="lab_91LII8H9HHHK_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum" xlink:label="loc_4397K522K7669JF3GI3J_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum" xml:lang="en-US">Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate Minimum</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum" xml:lang="en-US">Risk-free interest rates, minimum</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum" xlink:to="lab_6519M744M9881LH5IK5L_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum" xlink:label="loc_79JGG6F7FFFI_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum" xml:lang="en-US">Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate Maximum</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum" xml:lang="en-US">Risk-free interest rates, maximum</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum" xlink:to="lab_91LII8H9HHHK_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate" xlink:label="loc_4397K522K7669JF3GI3J_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate" xml:lang="en-US">Risk-free interest rates</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate" xlink:to="lab_6519M744M9881LH5IK5L_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1" xlink:label="loc_79JGG6F7FFFI_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1" xml:lang="en-US">Sharebased Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions Expected Term 1</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1" xml:lang="en-US">Expected lives (in years)</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1" xlink:to="lab_91LII8H9HHHK_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" xlink:label="loc_4397K522K7669JF3GI3J_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" xml:lang="en-US">Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" xml:lang="en-US">Weighted-average grant date fair value</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" xlink:to="lab_6519M744M9881LH5IK5L_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/>
<loc xlink:type="locator" xlink:href="zn-20130930.xsd#zn_PeriodAxis" xlink:label="loc_79JGG6F7FFFI_zn_PeriodAxis" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_zn_PeriodAxis" xml:lang="en-US">Period [Axis]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_zn_PeriodAxis" xml:lang="en-US">Period [Axis]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_91LII8H9HHHK_zn_PeriodAxis" xml:lang="en-US">Period [Axis]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_zn_PeriodAxis" xlink:to="lab_91LII8H9HHHK_zn_PeriodAxis"/>
<loc xlink:type="locator" xlink:href="zn-20130930.xsd#zn_PeriodDomain" xlink:label="loc_4397K522K7669JF3GI3J_zn_PeriodDomain" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_zn_PeriodDomain" xml:lang="en-US">Period [Domain]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_zn_PeriodDomain" xml:lang="en-US">Period [Domain]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_6519M744M9881LH5IK5L_zn_PeriodDomain" xml:lang="en-US">Period [Domain]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_zn_PeriodDomain" xlink:to="lab_6519M744M9881LH5IK5L_zn_PeriodDomain"/>
<loc xlink:type="locator" xlink:href="zn-20130930.xsd#zn_FiscalYearTwentyThirteenMember" xlink:label="loc_79JGG6F7FFFI_zn_FiscalYearTwentyThirteenMember" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_zn_FiscalYearTwentyThirteenMember" xml:lang="en-US">Fiscal Year Twenty Thirteen [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_zn_FiscalYearTwentyThirteenMember" xml:lang="en-US">During 2013 [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_91LII8H9HHHK_zn_FiscalYearTwentyThirteenMember" xml:lang="en-US">Fiscal Year 2013 [Member]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_zn_FiscalYearTwentyThirteenMember" xlink:to="lab_91LII8H9HHHK_zn_FiscalYearTwentyThirteenMember"/>
<loc xlink:type="locator" xlink:href="zn-20130930.xsd#zn_FiscalYearTwentyFourteenMember" xlink:label="loc_4397K522K7669JF3GI3J_zn_FiscalYearTwentyFourteenMember" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_zn_FiscalYearTwentyFourteenMember" xml:lang="en-US">Fiscal Year Twenty Fourteen [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_zn_FiscalYearTwentyFourteenMember" xml:lang="en-US">During 2014 [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_6519M744M9881LH5IK5L_zn_FiscalYearTwentyFourteenMember" xml:lang="en-US">Fiscal Year 2014 [Member].</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_zn_FiscalYearTwentyFourteenMember" xlink:to="lab_6519M744M9881LH5IK5L_zn_FiscalYearTwentyFourteenMember"/>
<loc xlink:type="locator" xlink:href="zn-20130930.xsd#zn_OperationalCosts" xlink:label="loc_79JGG6F7FFFI_zn_OperationalCosts" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_zn_OperationalCosts" xml:lang="en-US">Operational Costs</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_zn_OperationalCosts" xml:lang="en-US">Inventory, and other operational related costs</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_91LII8H9HHHK_zn_OperationalCosts" xml:lang="en-US">Operational cost excluded</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_zn_OperationalCosts" xlink:to="lab_91LII8H9HHHK_zn_OperationalCosts"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SalariesAndWages" xlink:label="loc_4397K522K7669JF3GI3J_us-gaap_SalariesAndWages" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_SalariesAndWages" xml:lang="en-US">Compensation</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_SalariesAndWages" xml:lang="en-US">Capitalized salary costs</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_us-gaap_SalariesAndWages" xlink:to="lab_6519M744M9881LH5IK5L_us-gaap_SalariesAndWages"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LegalFees" xlink:label="loc_79JGG6F7FFFI_us-gaap_LegalFees" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_us-gaap_LegalFees" xml:lang="en-US">Legal Fees</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_LegalFees" xml:lang="en-US">Legal costs, license fees and other preparation costs</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_us-gaap_LegalFees" xlink:to="lab_91LII8H9HHHK_us-gaap_LegalFees"/>
<loc xlink:type="locator" xlink:href="zn-20130930.xsd#zn_OtherCosts" xlink:label="loc_4397K522K7669JF3GI3J_zn_OtherCosts" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_zn_OtherCosts" xml:lang="en-US">Other Costs</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_zn_OtherCosts" xml:lang="en-US">Other costs</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_6519M744M9881LH5IK5L_zn_OtherCosts" xml:lang="en-US">Other Costs</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_zn_OtherCosts" xlink:to="lab_6519M744M9881LH5IK5L_zn_OtherCosts"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortization" xlink:label="loc_79JGG6F7FFFI_us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortization" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortization" xml:lang="en-US">Capitalized Costs of Unproved Properties Excluded from Amortization, Period Cost</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortization" xml:lang="en-US">Capitalized exploration costs</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortization" xml:lang="en-US">Total unproved oil and gas properties, full cost method</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortization" xlink:to="lab_91LII8H9HHHK_us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortization"/>
<loc xlink:type="locator" xlink:href="zn-20130930.xsd#zn_DrillingOperationAndCompletionCostsAndOtherRelatedCostsImpairments" xlink:label="loc_4397K522K7669JF3GI3J_zn_DrillingOperationAndCompletionCostsAndOtherRelatedCostsImpairments" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_zn_DrillingOperationAndCompletionCostsAndOtherRelatedCostsImpairments" xml:lang="en-US">Drilling Operation And Completion Costs And Other Related Costs Impairments</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_zn_DrillingOperationAndCompletionCostsAndOtherRelatedCostsImpairments" xml:lang="en-US">Drilling operation, completion costs and other related costs</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_6519M744M9881LH5IK5L_zn_DrillingOperationAndCompletionCostsAndOtherRelatedCostsImpairments" xml:lang="en-US">Drilling Operation And Completion Costs And Other Related Costs Impairments</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_zn_DrillingOperationAndCompletionCostsAndOtherRelatedCostsImpairments" xlink:to="lab_6519M744M9881LH5IK5L_zn_DrillingOperationAndCompletionCostsAndOtherRelatedCostsImpairments"/>
<loc xlink:type="locator" xlink:href="zn-20130930.xsd#zn_CapitalizedSalaryCosts" xlink:label="loc_79JGG6F7FFFI_zn_CapitalizedSalaryCosts" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_zn_CapitalizedSalaryCosts" xml:lang="en-US">Capitalized salary costs</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_zn_CapitalizedSalaryCosts" xml:lang="en-US">Capitalized salary costs</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_91LII8H9HHHK_zn_CapitalizedSalaryCosts" xml:lang="en-US">Capitalized salary costs</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_zn_CapitalizedSalaryCosts" xlink:to="lab_91LII8H9HHHK_zn_CapitalizedSalaryCosts"/>
<loc xlink:type="locator" xlink:href="zn-20130930.xsd#zn_LegalCostsLicenseFeesAndOtherPreparationCosts" xlink:label="loc_4397K522K7669JF3GI3J_zn_LegalCostsLicenseFeesAndOtherPreparationCosts" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_zn_LegalCostsLicenseFeesAndOtherPreparationCosts" xml:lang="en-US">Legal costs, license fees and other preparation costs</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_zn_LegalCostsLicenseFeesAndOtherPreparationCosts" xml:lang="en-US">Legal costs, license fees and other preparation costs</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_6519M744M9881LH5IK5L_zn_LegalCostsLicenseFeesAndOtherPreparationCosts" xml:lang="en-US">Legal costs, license fees and other preparation costs</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_zn_LegalCostsLicenseFeesAndOtherPreparationCosts" xlink:to="lab_6519M744M9881LH5IK5L_zn_LegalCostsLicenseFeesAndOtherPreparationCosts"/>
<loc xlink:type="locator" xlink:href="zn-20130930.xsd#zn_OtherImpairmentsOilAndCosts" xlink:label="loc_79JGG6F7FFFI_zn_OtherImpairmentsOilAndCosts" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_zn_OtherImpairmentsOilAndCosts" xml:lang="en-US">Other Impairments Oil And Costs</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_zn_OtherImpairmentsOilAndCosts" xml:lang="en-US">Other costs</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_91LII8H9HHHK_zn_OtherImpairmentsOilAndCosts" xml:lang="en-US">Other Impairments Oil And Costs</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_zn_OtherImpairmentsOilAndCosts" xlink:to="lab_91LII8H9HHHK_zn_OtherImpairmentsOilAndCosts"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis" xlink:label="loc_4397K522K7669JF3GI3J_us-gaap_PropertyPlantAndEquipmentByTypeAxis" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_PropertyPlantAndEquipmentByTypeAxis" xml:lang="en-US">Property, Plant and Equipment, Type [Axis]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_us-gaap_PropertyPlantAndEquipmentByTypeAxis" xlink:to="lab_6519M744M9881LH5IK5L_us-gaap_PropertyPlantAndEquipmentByTypeAxis"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="loc_79JGG6F7FFFI_us-gaap_PropertyPlantAndEquipmentTypeDomain" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_us-gaap_PropertyPlantAndEquipmentTypeDomain" xml:lang="en-US">Property Plant And Equipment Type [Domain]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_us-gaap_PropertyPlantAndEquipmentTypeDomain" xml:lang="en-US">Property, Plant and Equipment, Type [Domain]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:to="lab_91LII8H9HHHK_us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LandAndBuildingMember" xlink:label="loc_4397K522K7669JF3GI3J_us-gaap_LandAndBuildingMember" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_LandAndBuildingMember" xml:lang="en-US">Land And Building [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_LandAndBuildingMember" xml:lang="en-US">Land and Building [Member]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_us-gaap_LandAndBuildingMember" xlink:to="lab_6519M744M9881LH5IK5L_us-gaap_LandAndBuildingMember"/>
<loc xlink:type="locator" xlink:href="zn-20130930.xsd#zn_JosephLicenseMember" xlink:label="loc_79JGG6F7FFFI_zn_JosephLicenseMember" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_zn_JosephLicenseMember" xml:lang="en-US">Joseph License [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_zn_JosephLicenseMember" xml:lang="en-US">Joseph License [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_91LII8H9HHHK_zn_JosephLicenseMember" xml:lang="en-US">Joseph License [Member].</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_zn_JosephLicenseMember" xlink:to="lab_91LII8H9HHHK_zn_JosephLicenseMember"/>
<loc xlink:type="locator" xlink:href="zn-20130930.xsd#zn_JordanValleyLicenseMember" xlink:label="loc_4397K522K7669JF3GI3J_zn_JordanValleyLicenseMember" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_zn_JordanValleyLicenseMember" xml:lang="en-US">Jordan Valley License [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_zn_JordanValleyLicenseMember" xml:lang="en-US">Jordan Valley License [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_6519M744M9881LH5IK5L_zn_JordanValleyLicenseMember" xml:lang="en-US">Jordan Valley License [Member].</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_zn_JordanValleyLicenseMember" xlink:to="lab_6519M744M9881LH5IK5L_zn_JordanValleyLicenseMember"/>
<loc xlink:type="locator" xlink:href="zn-20130930.xsd#zn_MegiddoJezreelValleyLicenseAreaMember" xlink:label="loc_79JGG6F7FFFI_zn_MegiddoJezreelValleyLicenseAreaMember" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_zn_MegiddoJezreelValleyLicenseAreaMember" xml:lang="en-US">Megiddo Jezreel Valley License Area [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_zn_MegiddoJezreelValleyLicenseAreaMember" xml:lang="en-US">Megiddo-Jezreel Valley Potential License Area [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_91LII8H9HHHK_zn_MegiddoJezreelValleyLicenseAreaMember" xml:lang="en-US">Megiddo-Jezreel Valley License Area [Member].</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_zn_MegiddoJezreelValleyLicenseAreaMember" xlink:to="lab_91LII8H9HHHK_zn_MegiddoJezreelValleyLicenseAreaMember"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PropertyPlantAndEquipmentOtherTypesMember" xlink:label="loc_4397K522K7669JF3GI3J_us-gaap_PropertyPlantAndEquipmentOtherTypesMember" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_PropertyPlantAndEquipmentOtherTypesMember" xml:lang="en-US">Property Plant And Equipment Other Types [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_PropertyPlantAndEquipmentOtherTypesMember" xml:lang="en-US">Property, Plant and Equipment, Other Types [Member]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_us-gaap_PropertyPlantAndEquipmentOtherTypesMember" xlink:to="lab_6519M744M9881LH5IK5L_us-gaap_PropertyPlantAndEquipmentOtherTypesMember"/>
<loc xlink:type="locator" xlink:href="zn-20130930.xsd#zn_AsherMenasheLicenseMember" xlink:label="loc_79JGG6F7FFFI_zn_AsherMenasheLicenseMember" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_zn_AsherMenasheLicenseMember" xml:lang="en-US">Asher Menashe License [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_zn_AsherMenasheLicenseMember" xml:lang="en-US">Asher-Menashe License [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_91LII8H9HHHK_zn_AsherMenasheLicenseMember" xml:lang="en-US">Asher Menashe License [Member].</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_zn_AsherMenasheLicenseMember" xlink:to="lab_91LII8H9HHHK_zn_AsherMenasheLicenseMember"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:label="loc_4397K522K7669JF3GI3J_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xml:lang="en-US">Related Party [Axis]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:to="lab_6519M744M9881LH5IK5L_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RelatedPartyDomain" xlink:label="loc_79JGG6F7FFFI_us-gaap_RelatedPartyDomain" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_us-gaap_RelatedPartyDomain" xml:lang="en-US">Related Party [Domain]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_us-gaap_RelatedPartyDomain" xlink:to="lab_91LII8H9HHHK_us-gaap_RelatedPartyDomain"/>
<loc xlink:type="locator" xlink:href="zn-20130930.xsd#zn_GypDrillingContractorMember" xlink:label="loc_4397K522K7669JF3GI3J_zn_GypDrillingContractorMember" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_zn_GypDrillingContractorMember" xml:lang="en-US">Gyp Drilling Contractor [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_6519M744M9881LH5IK5L_zn_GypDrillingContractorMember" xml:lang="en-US">GYP [Member]</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_6519M744M9881LH5IK5L_zn_GypDrillingContractorMember" xml:lang="en-US">GYP drilling contractor.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_zn_GypDrillingContractorMember" xlink:to="lab_6519M744M9881LH5IK5L_zn_GypDrillingContractorMember"/>
<loc xlink:type="locator" xlink:href="zn-20130930.xsd#zn_PercentageOfEstimatedDrillingCostsByApplicant" xlink:label="loc_79JGG6F7FFFI_zn_PercentageOfEstimatedDrillingCostsByApplicant" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_zn_PercentageOfEstimatedDrillingCostsByApplicant" xml:lang="en-US">Percentage of estimated drilling costs by applicant</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_zn_PercentageOfEstimatedDrillingCostsByApplicant" xml:lang="en-US">Exploratory licensing guidelines, estimated drilling costs supported by applicant</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_91LII8H9HHHK_zn_PercentageOfEstimatedDrillingCostsByApplicant" xml:lang="en-US">The estimated drilling costs percentage required by applicant to demonstrate.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_zn_PercentageOfEstimatedDrillingCostsByApplicant" xlink:to="lab_91LII8H9HHHK_zn_PercentageOfEstimatedDrillingCostsByApplicant"/>
<loc xlink:type="locator" xlink:href="zn-20130930.xsd#zn_EstimatedFinancialResourcesAmountMinimum" xlink:label="loc_4397K522K7669JF3GI3J_zn_EstimatedFinancialResourcesAmountMinimum" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_zn_EstimatedFinancialResourcesAmountMinimum" xml:lang="en-US">Estimated Financial Resources Amount Minimum</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_zn_EstimatedFinancialResourcesAmountMinimum" xml:lang="en-US">Estimated financial resources amount, minimum</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_6519M744M9881LH5IK5L_zn_EstimatedFinancialResourcesAmountMinimum" xml:lang="en-US">Estimated financial resources amount, minimum.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_zn_EstimatedFinancialResourcesAmountMinimum" xlink:to="lab_6519M744M9881LH5IK5L_zn_EstimatedFinancialResourcesAmountMinimum"/>
<loc xlink:type="locator" xlink:href="zn-20130930.xsd#zn_DemobilizationFeesForLeasedEquipment" xlink:label="loc_79JGG6F7FFFI_zn_DemobilizationFeesForLeasedEquipment" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_zn_DemobilizationFeesForLeasedEquipment" xml:lang="en-US">Demobilization Fees For Leased Equipment</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_zn_DemobilizationFeesForLeasedEquipment" xml:lang="en-US">Demobilization fee</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="lab_91LII8H9HHHK_zn_DemobilizationFeesForLeasedEquipment" xml:lang="en-US">Requested payment of Demobilization fee by GYP</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_91LII8H9HHHK_zn_DemobilizationFeesForLeasedEquipment" xml:lang="en-US">Demobilization fees for leased equipment.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_zn_DemobilizationFeesForLeasedEquipment" xlink:to="lab_91LII8H9HHHK_zn_DemobilizationFeesForLeasedEquipment"/>
<loc xlink:type="locator" xlink:href="zn-20130930.xsd#zn_ForeignCountryGuidelinePerformanceGuaranteePercentage" xlink:label="loc_4397K522K7669JF3GI3J_zn_ForeignCountryGuidelinePerformanceGuaranteePercentage" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_zn_ForeignCountryGuidelinePerformanceGuaranteePercentage" xml:lang="en-US">Foreign Country Guideline Performance Guarantee Percentage</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_zn_ForeignCountryGuidelinePerformanceGuaranteePercentage" xml:lang="en-US">Foreign country guideline performance guarantee percentage</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_6519M744M9881LH5IK5L_zn_ForeignCountryGuidelinePerformanceGuaranteePercentage" xml:lang="en-US">Foreign country guideline performance guarantee percentage.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_zn_ForeignCountryGuidelinePerformanceGuaranteePercentage" xlink:to="lab_6519M744M9881LH5IK5L_zn_ForeignCountryGuidelinePerformanceGuaranteePercentage"/>
<loc xlink:type="locator" xlink:href="zn-20130930.xsd#zn_ForeignCountryBankGuaranteeRequirementAmountOne" xlink:label="loc_79JGG6F7FFFI_zn_ForeignCountryBankGuaranteeRequirementAmountOne" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_zn_ForeignCountryBankGuaranteeRequirementAmountOne" xml:lang="en-US">Foreign Country Bank Guarantee Requirement Amount One</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_zn_ForeignCountryBankGuaranteeRequirementAmountOne" xml:lang="en-US">Foreign country bank guarantee requirement, drilling depth amount one</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_91LII8H9HHHK_zn_ForeignCountryBankGuaranteeRequirementAmountOne" xml:lang="en-US">Foreign country bank guarantee requirement amount one.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_zn_ForeignCountryBankGuaranteeRequirementAmountOne" xlink:to="lab_91LII8H9HHHK_zn_ForeignCountryBankGuaranteeRequirementAmountOne"/>
<loc xlink:type="locator" xlink:href="zn-20130930.xsd#zn_ForeignCountryBankGuaranteeRequirementDrillingDepthOne" xlink:label="loc_4397K522K7669JF3GI3J_zn_ForeignCountryBankGuaranteeRequirementDrillingDepthOne" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_zn_ForeignCountryBankGuaranteeRequirementDrillingDepthOne" xml:lang="en-US">Foreign Country Bank Guarantee Requirement Drilling Depth One</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_zn_ForeignCountryBankGuaranteeRequirementDrillingDepthOne" xml:lang="en-US">Foreign country bank guarantee requirement, drilling depth one</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_6519M744M9881LH5IK5L_zn_ForeignCountryBankGuaranteeRequirementDrillingDepthOne" xml:lang="en-US">Foreign country bank guarantee requirement drilling depth one.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_zn_ForeignCountryBankGuaranteeRequirementDrillingDepthOne" xlink:to="lab_6519M744M9881LH5IK5L_zn_ForeignCountryBankGuaranteeRequirementDrillingDepthOne"/>
<loc xlink:type="locator" xlink:href="zn-20130930.xsd#zn_ForeignCountryBankGuaranteeRequirementAmountTwo" xlink:label="loc_79JGG6F7FFFI_zn_ForeignCountryBankGuaranteeRequirementAmountTwo" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_zn_ForeignCountryBankGuaranteeRequirementAmountTwo" xml:lang="en-US">Foreign Country Bank Guarantee Requirement Amount Two</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_zn_ForeignCountryBankGuaranteeRequirementAmountTwo" xml:lang="en-US">Foreign country bank guarantee requirement, above drilling depth one, amount two</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_91LII8H9HHHK_zn_ForeignCountryBankGuaranteeRequirementAmountTwo" xml:lang="en-US">Foreign country bank guarantee requirement amount two.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_zn_ForeignCountryBankGuaranteeRequirementAmountTwo" xlink:to="lab_91LII8H9HHHK_zn_ForeignCountryBankGuaranteeRequirementAmountTwo"/>
<loc xlink:type="locator" xlink:href="zn-20130930.xsd#zn_OtherApplicantLicenseOpportunityPeriod" xlink:label="loc_4397K522K7669JF3GI3J_zn_OtherApplicantLicenseOpportunityPeriod" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_zn_OtherApplicantLicenseOpportunityPeriod" xml:lang="en-US">Other Applicant License Opportunity Period</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_zn_OtherApplicantLicenseOpportunityPeriod" xml:lang="en-US">Other applicant license opportunity period</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_6519M744M9881LH5IK5L_zn_OtherApplicantLicenseOpportunityPeriod" xml:lang="en-US">Other applicant license opportunity period.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_zn_OtherApplicantLicenseOpportunityPeriod" xlink:to="lab_6519M744M9881LH5IK5L_zn_OtherApplicantLicenseOpportunityPeriod"/>
<loc xlink:type="locator" xlink:href="zn-20130930.xsd#zn_NumberOfDaysForCommentOnDrillingApplication" xlink:label="loc_79JGG6F7FFFI_zn_NumberOfDaysForCommentOnDrillingApplication" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_zn_NumberOfDaysForCommentOnDrillingApplication" xml:lang="en-US">Number Of Days For Comment On Drilling Application</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_zn_NumberOfDaysForCommentOnDrillingApplication" xml:lang="en-US">Comment drilling application, period</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_91LII8H9HHHK_zn_NumberOfDaysForCommentOnDrillingApplication" xml:lang="en-US">The number of days for comment on drilling application.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_zn_NumberOfDaysForCommentOnDrillingApplication" xlink:to="lab_91LII8H9HHHK_zn_NumberOfDaysForCommentOnDrillingApplication"/>
<loc xlink:type="locator" xlink:href="zn-20130930.xsd#zn_AdditionalLengthLeaseTerm" xlink:label="loc_4397K522K7669JF3GI3J_zn_AdditionalLengthLeaseTerm" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_zn_AdditionalLengthLeaseTerm" xml:lang="en-US">Additional Length Lease Term</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_zn_AdditionalLengthLeaseTerm" xml:lang="en-US">Length of lease, additional term</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_6519M744M9881LH5IK5L_zn_AdditionalLengthLeaseTerm" xml:lang="en-US">Additional length lease term.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_zn_AdditionalLengthLeaseTerm" xlink:to="lab_6519M744M9881LH5IK5L_zn_AdditionalLengthLeaseTerm"/>
<loc xlink:type="locator" xlink:href="zn-20130930.xsd#zn_AggregateLengthOfLeaseIncludingExtensions" xlink:label="loc_79JGG6F7FFFI_zn_AggregateLengthOfLeaseIncludingExtensions" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_zn_AggregateLengthOfLeaseIncludingExtensions" xml:lang="en-US">Aggregate Length Of Lease Including Extensions</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_zn_AggregateLengthOfLeaseIncludingExtensions" xml:lang="en-US">Aggregate length of lease, including extensions</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_91LII8H9HHHK_zn_AggregateLengthOfLeaseIncludingExtensions" xml:lang="en-US">Aggregate length of lease, including extensions.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_zn_AggregateLengthOfLeaseIncludingExtensions" xlink:to="lab_91LII8H9HHHK_zn_AggregateLengthOfLeaseIncludingExtensions"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AreaOfLand" xlink:label="loc_4397K522K7669JF3GI3J_us-gaap_AreaOfLand" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_AreaOfLand" xml:lang="en-US">Area of Land</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_AreaOfLand" xml:lang="en-US">Area of land, approximate</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_us-gaap_AreaOfLand" xlink:to="lab_6519M744M9881LH5IK5L_us-gaap_AreaOfLand"/>
<loc xlink:type="locator" xlink:href="zn-20130930.xsd#zn_InitialLengthOfLeasePeriod" xlink:label="loc_79JGG6F7FFFI_zn_InitialLengthOfLeasePeriod" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_zn_InitialLengthOfLeasePeriod" xml:lang="en-US">Initial Length Of Lease Period</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_zn_InitialLengthOfLeasePeriod" xml:lang="en-US">Initial length of lease period</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_91LII8H9HHHK_zn_InitialLengthOfLeasePeriod" xml:lang="en-US">Initial length of lease period.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_zn_InitialLengthOfLeasePeriod" xlink:to="lab_91LII8H9HHHK_zn_InitialLengthOfLeasePeriod"/>
<loc xlink:type="locator" xlink:href="zn-20130930.xsd#zn_NumberOfAnnualExtensions" xlink:label="loc_4397K522K7669JF3GI3J_zn_NumberOfAnnualExtensions" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_zn_NumberOfAnnualExtensions" xml:lang="en-US">Number Of Annual Extensions</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_zn_NumberOfAnnualExtensions" xml:lang="en-US">Number of annual extensions</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_6519M744M9881LH5IK5L_zn_NumberOfAnnualExtensions" xml:lang="en-US">Number of annual extensions.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_zn_NumberOfAnnualExtensions" xlink:to="lab_6519M744M9881LH5IK5L_zn_NumberOfAnnualExtensions"/>
<loc xlink:type="locator" xlink:href="zn-20130930.xsd#zn_NumberOfWellsInLicenseArea" xlink:label="loc_79JGG6F7FFFI_zn_NumberOfWellsInLicenseArea" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_zn_NumberOfWellsInLicenseArea" xml:lang="en-US">Number Of Wells In License Area</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_91LII8H9HHHK_zn_NumberOfWellsInLicenseArea" xml:lang="en-US">Number of wells in license area</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_91LII8H9HHHK_zn_NumberOfWellsInLicenseArea" xml:lang="en-US">Number of wells in license area.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_zn_NumberOfWellsInLicenseArea" xlink:to="lab_91LII8H9HHHK_zn_NumberOfWellsInLicenseArea"/>
<loc xlink:type="locator" xlink:href="zn-20130930.xsd#zn_WellPluggingAndAbandonmentCompletionPeriodRequirement" xlink:label="loc_4397K522K7669JF3GI3J_zn_WellPluggingAndAbandonmentCompletionPeriodRequirement" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_zn_WellPluggingAndAbandonmentCompletionPeriodRequirement" xml:lang="en-US">Well Plugging And Abandonment Completion Period Requirement</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_6519M744M9881LH5IK5L_zn_WellPluggingAndAbandonmentCompletionPeriodRequirement" xml:lang="en-US">Well plugging and abandonment completion period, requirement</label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_6519M744M9881LH5IK5L_zn_WellPluggingAndAbandonmentCompletionPeriodRequirement" xml:lang="en-US">Well plugging and abandonment completion period, requirement.</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_zn_WellPluggingAndAbandonmentCompletionPeriodRequirement" xlink:to="lab_6519M744M9881LH5IK5L_zn_WellPluggingAndAbandonmentCompletionPeriodRequirement"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SubsequentEventTypeAxis" xlink:label="loc_79JGG6F7FFFI_us-gaap_SubsequentEventTypeAxis" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_us-gaap_SubsequentEventTypeAxis" xml:lang="en-US">Subsequent Event Type [Axis]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_us-gaap_SubsequentEventTypeAxis" xlink:to="lab_91LII8H9HHHK_us-gaap_SubsequentEventTypeAxis"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SubsequentEventTypeDomain" xlink:label="loc_4397K522K7669JF3GI3J_us-gaap_SubsequentEventTypeDomain" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_6519M744M9881LH5IK5L_us-gaap_SubsequentEventTypeDomain" xml:lang="en-US">Subsequent Event Type [Domain]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_4397K522K7669JF3GI3J_us-gaap_SubsequentEventTypeDomain" xlink:to="lab_6519M744M9881LH5IK5L_us-gaap_SubsequentEventTypeDomain"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SubsequentEventMember" xlink:label="loc_79JGG6F7FFFI_us-gaap_SubsequentEventMember" />
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_91LII8H9HHHK_us-gaap_SubsequentEventMember" xml:lang="en-US">Subsequent Event [Member]</label>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_79JGG6F7FFFI_us-gaap_SubsequentEventMember" xlink:to="lab_91LII8H9HHHK_us-gaap_SubsequentEventMember"/>
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