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Condensed Consolidated Statements of Operations and Comprehensive Income (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2012 | Mar. 31, 2011
Sales of products | $ 91,153 | $ 136,364
Cost of sales and other direct production costs | 33,290 | 44,529
Depreciation, depletion and amortization | 9,661 | 12,262
| 42,951 | 56,791
Gross profit | 48,202 | 79,573
Other operating expenses: |  |
General and administrative | 4,501 | 4,699
Exploration | 5,611 | 3,301
Pre-development | 3,366 |
Other operating expense | 944 | 1,817
Provision for closed operations and environmental matters | 2,178 | 1,021
Lucky Friday suspension-related costs | 6,166 |
| 22,766 | 10,838
Income from operations | 25,436 | 68,735
Other income (expense): |  |
Gain on sale of investments |  | 611
Loss on derivative contracts | (5,231) | (2,034)
Interest and other income | 149 | 18
Interest expense | (467) | (477)
| (5,549) | (1,882)
Income before income taxes | 19,887 | 66,853
Income tax provision | (7,315) | (23,496)
Net income | 12,572 | 43,357
Preferred stock dividends | (138) | (138)
Income applicable to common shareholders | 12,434 | 43,219
Comprehensive income: |  |
Reclassification of net gain on sale of marketable securities included in net income |  | (611)
Unrealized holding gains (losses) on investments | (219) | 967
Comprehensive income | $ 12,353 | $ 43,713
Basic income per common share after preferred dividends (in Dollars per share) | $ 0.04 | $ 0.16
Diluted income per common share after preferred dividends (in Dollars per share) | $ 0.04 | $ 0.15
Weighted average number of common shares outstanding - basic (in Shares) | 285,292 | 278,448
Weighted average number of common shares outstanding - diluted (in Shares) | 296,928 | 296,244

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