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Note 5 - Income Taxes (Detail) - Components of the Net Deferred Tax Asset (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
--- | --- | --- | --- | ---
Deferred tax assets: |  |  |  |
Accrued reclamation costs | $ 45,653 | $ 62,225 |  |
Deferred exploration | 32,396 | 18,585 |  |
Foreign net operating losses | 20,247 | 20,234 |  |
Federal net operating losses | 44,146 | 47,875 |  |
State net operating losses | 668 | 2,445 |  |
AMT credit carryforwards | 24,603 | 15,210 |  |
Pension and benefit obligation | 12,488 | 9,940 |  |
Miscellaneous | 17,437 | 16,002 |  |
Total deferred tax assets | 197,638 | 192,516 |  |
Valuation allowance | (23,030) | (22,895) | (19,073) | (104,429)
Total deferred tax assets | 174,608 | 169,621 |  |
Deferred tax liabilities: |  |  |  |
Unrealized gain on derivatives contracts | (1,262) | (13,293) |  |
Properties, plants and equipment | (57,583) | (40,490) |  |
Total deferred tax liabilities | (58,845) | (53,783) |  |
Net deferred tax asset | $ 115,763 | $ 115,838 |  |

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