Condensed Consolidated Statements of Operations and Comprehensive Income (Loss) (Unaudited) (USD $) In Thousands, except Per Share data	3 Months Ended	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Condensed Consolidated Statements of Operations and Comprehensive Income (Loss) [Abstract]
Sales of metal	$ 231,090	$ 101,018	$ 430,714	$ 189,307
Production costs applicable to sales	(77,102)	(58,590)	(169,576)	(110,393)
Depreciation, depletion and amortization	(57,641)	(29,983)	(107,682)	(57,702)
Gross profit	96,347	12,445	153,456	21,212
COSTS AND EXPENSES
Administrative and general	1,827	6,859	14,058	13,794
Exploration	4,077	3,161	6,839	5,681
Pre-development, care, maintenance and other	11,104	565	14,678	732
Total cost and expenses	17,008	10,585	35,575	20,207
OPERATING INCOME	79,339	1,860	117,881	1,005
OTHER INCOME AND EXPENSE
Loss on debt extinguishment	(389)	(4,050)	(856)	(11,908)
Fair value adjustments, net	(12,432)	(42,516)	(17,700)	(46,774)
Interest income and other	2,763	(3,821)	4,664	(2,088)
Interest expense, net of capitalized interest	(9,268)	(5,646)	(18,573)	(11,451)
Total other income and expense	(19,326)	(56,033)	(32,465)	(72,221)
Income (loss) from continuing operations before income taxes	60,013	(54,173)	85,416	(71,216)
Income tax benefit (provision)	(21,402)	9,372	(34,341)	16,370
Income (loss) from continuing operations	38,611	(44,801)	51,075	(54,846)
Loss from discontinued operations, net of income taxes		(2,966)		(5,778)
Loss on sale of net assets of discontinued operations, net of income taxes		(2,977)		(2,977)
NET INCOME (LOSS)	38,611	(50,744)	51,075	(63,601)
Other comprehensive loss, net of income taxes	(1,387)		(1,387)	(5)
COMPREHENSIVE INCOME (LOSS)	$ 37,224	$ (50,744)	$ 49,688	$ (63,606)
Basic income per share:
Income (loss) from continuing operations	$ 0.43	$ (0.5)	$ 0.57	$ (0.64)
Income (loss) from discontinued operations		$ (0.07)		$ (0.11)
Net income (loss)	$ 0.43	$ (0.57)	$ 0.57	$ (0.75)
Diluted income per share:
Income (loss) from continuing operations	$ 0.43	$ (0.50)	$ 0.57	$ (0.64)
Income (loss) from discontinued operations		$ (0.07)		$ (0.11)
Net income (loss)	$ 0.43	$ (0.57)	$ 0.57	$ (0.75)
Weighted average number of shares of common stock
Basic	89,310	88,501	89,299	85,145
Diluted	89,712	88,501	89,683	85,145

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Pre-development.

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The change in equity [net assets] of a business enterprise during a period from transactions and other events and circumstances from non-owner sources which are attributable to the reporting entity. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, but excludes any and all transactions which are directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent.

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Total costs related to goods produced and sold during the reporting period.

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Gain (loss) after tax expense (benefit), not previously recognized and resulting from the sale of a business component, which is recognized at the date of sale. A gain (loss) reflects the amount by which the consideration received exceeds (is exceeded by) the net carrying amount (reflecting previous provisions for loss on disposal, if any) of the disposal group.

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The amount of net income or loss for the period per each share of common stock and dilutive common stock equivalents outstanding during the reporting period.

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Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects.

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Amount represents the difference between the fair value of the payments made and the carrying amount of the debt at the time of its extinguishment.

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The aggregate total of expenses of managing and administering the affairs of an entity, including affiliates of the reporting entity, which are not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

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Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

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This element represents the income or loss from continuing operations attributable to the reporting entity which may also be defined as revenue less expenses and taxes from ongoing operations before extraordinary items and cumulative effects of changes in accounting principles, but after deduction of those portions of income or loss from continuing operations that are allocable to noncontrolling interests, if any.

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Sum of operating profit and nonoperating income (expense) before income (loss) from equity method investments, income taxes, extraordinary items, cumulative effects of changes in accounting principles, and noncontrolling interest.

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The amount of income (loss) from continuing operations per each share of common stock outstanding during the reporting period.

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The amount of income (loss) from continuing operations available to each share of common stock outstanding during the reporting period and each share that would have been outstanding assuming the issuance of common shares for all dilutive potential common shares outstanding during the reporting period.

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This element represents the overall income (loss) from a disposal group apportioned to the parent that is classified as a component of the entity, net of income tax, reported as a separate component of income before extraordinary items and the cumulative effect of accounting changes after deduction or consideration of the amount which may be allocable to noncontrolling interests, if any. Includes the following (net of tax): income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

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The amount of income (loss) from disposition of discontinued operations, net of related tax effect, per each share of common stock outstanding during the reporting period.

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The amount of income (loss) from discontinued operations, net of related tax effect, per each diluted share of common stock outstanding during the reporting period.

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The sum of the current income tax expense (benefit) and the deferred income tax expense (benefit) pertaining to continuing operations.

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The cost of borrowed funds accounted for as interest that was charged against earnings during the period.

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The portion of consolidated profit or loss for the period, net of income taxes, which is attributable to the parent. If the entity does not present consolidated financial statements, the amount of profit or loss for the period, net of income taxes.

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Generally recurring costs associated with normal operations except for the portion of these expenses which can be clearly related to production and included in cost of sales or services. Includes selling, general and administrative expense.

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The net result for the period of deducting operating expenses from operating revenues.

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This element represents Other Comprehensive Income (Loss), Net of Tax, for the period attributable to the parent entity. Includes deferred gains (losses) on qualifying hedges, unrealized holding gains (losses) on available-for-sale securities, minimum pension liability, and cumulative translation adjustment.

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Aggregate revenue during the period from the sale of goods in the normal course of business, after deducting returns, allowances and discounts.

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The average number of shares issued and outstanding that are used in calculating diluted EPS, determined based on the timing of issuance of shares in the period.

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Number of [basic] shares, after adjustment for contingently issuable shares and other shares not deemed outstanding, determined by relating the portion of time within a reporting period that common shares have been outstanding to the total time in that period.

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