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  <xsd:element name="ConcentrationRiskMaximumBankDepositsInsured" id="mgn_ConcentrationRiskMaximumBankDepositsInsured" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="ConcentrationRiskUninsuredBankDeposits" id="mgn_ConcentrationRiskUninsuredBankDeposits" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="ClassOfWarrantOrRightCumulativeNumberOfWarrantsOrRightsExercised" id="mgn_ClassOfWarrantOrRightCumulativeNumberOfWarrantsOrRightsExercised" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="ClassOfWarrantOrRightNumberOfWarrantsOrRightsExercised" id="mgn_ClassOfWarrantOrRightNumberOfWarrantsOrRightsExercised" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ScheduleOfShareBasedCompensationNonvestedStockOptionsActivityTableTextBlock" id="mgn_ScheduleOfShareBasedCompensationNonvestedStockOptionsActivityTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="EquityIncentivePlan2012Member" id="mgn_EquityIncentivePlan2012Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisePriceAsPercentageOfFairMarketValueOfPerShareOnDateOfGrant" id="mgn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisePriceAsPercentageOfFairMarketValueOfPerShareOnDateOfGrant" type="num:percentItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardExpirationPeriod" id="mgn_ShareBasedCompensationArrangementByShareBasedPaymentAwardExpirationPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNonvestedNumber" id="mgn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNonvestedNumber" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNonvestedRollForward" id="mgn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNonvestedRollForward" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedInPeriod" id="mgn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedInPeriod" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsWeightedAverageRemainingContractualTermAbstract" id="mgn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsWeightedAverageRemainingContractualTermAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAggregateIntrinsicValueAbstract" id="mgn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAggregateIntrinsicValueAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValue" id="mgn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValue" type="num:perShareItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedInPeriodWeightedAverageGrantDateFairValue" id="mgn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedInPeriodWeightedAverageGrantDateFairValue" type="num:perShareItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValueAbstract" id="mgn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValueAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ExplorationEarnInAgreementMember" id="mgn_ExplorationEarnInAgreementMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PercentageOfExplorationPropertyThatCouldBeAcquired" id="mgn_PercentageOfExplorationPropertyThatCouldBeAcquired" type="num:percentItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="ExpenditureToBeSpentOnExplorationActivityForAcquiringExplorationProperty" id="mgn_ExpenditureToBeSpentOnExplorationActivityForAcquiringExplorationProperty" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="AnnualCashPaymentsToBeMadePriorToTheEndOfTheFirstYear" id="mgn_AnnualCashPaymentsToBeMadePriorToTheEndOfTheFirstYear" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="AnnualCashPaymentsToBeMadePriorToTheEndOfEachSubsequentYearUntilCompletionOfEarnInPeriod" id="mgn_AnnualCashPaymentsToBeMadePriorToTheEndOfEachSubsequentYearUntilCompletionOfEarnInPeriod" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="MinimumExpenditureOnExplorationAndDevelopmentActivityToBePaidInEachYear" id="mgn_MinimumExpenditureOnExplorationAndDevelopmentActivityToBePaidInEachYear" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="StockIssuedDuringPeriodSharesNewIssuesOnExerciseOfOverAllotmentOptionByUnderwriter" id="mgn_StockIssuedDuringPeriodSharesNewIssuesOnExerciseOfOverAllotmentOptionByUnderwriter" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="FairValueAssumptionsTermOfUSTreasurySecuritiesUsedForDeterminingRiskFreeInterestRate" id="mgn_FairValueAssumptionsTermOfUSTreasurySecuritiesUsedForDeterminingRiskFreeInterestRate" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="EstrellaGoldCorpMember" id="mgn_EstrellaGoldCorpMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="StockIssuedDuringPeriodSharesNewIssuesExcludingExerciseOfOverAllotmentOptionByUnderwriter" id="mgn_StockIssuedDuringPeriodSharesNewIssuesExcludingExerciseOfOverAllotmentOptionByUnderwriter" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ProceedsFromIssuanceOfCommonStockGross" id="mgn_ProceedsFromIssuanceOfCommonStockGross" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumGrantPerEmployee" id="mgn_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumGrantPerEmployee" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
</xsd:schema>
