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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS |  |  |  |
Sales, net | $ 29,029 | $ 26,435 | $ 87,133 | $ 61,105
Production costs | 17,216 | 16,286 | 51,982 | 42,856
Depreciation and amortization | 3,521 | 4,340 | 11,299 | 13,537
Reclamation and remediation | 47 | 44 | 152 | 119
Total mine cost of sales | 20,784 | 20,670 | 63,433 | 56,512
Mine gross profit | 8,245 | 5,765 | 23,700 | 4,593
Costs and expenses: |  |  |  |
General and administrative expenses | 2,355 | 2,360 | 6,070 | 5,961
Exploration expenses | 1,805 | 1,019 | 3,660 | 2,132
Restructuring expenses |  |  | 496 |
Stock-based compensation | 30 | 305 | 711 | 1,175
Other expense (income), net | 174 | (599) | 727 | (1,043)
Total costs and expenses | 4,364 | 3,085 | 11,664 | 8,225
Income (loss) before income taxes | 3,881 | 2,680 | 12,036 | (3,632)
Provision for income taxes (benefit) | 2,352 | 2,931 | 6,697 | (420)
Net income (loss) from continuing operations | 1,529 | (251) | 5,339 | (3,212)
Net income from discontinued operations, net of income taxes |  | 5,252 |  | 3,280
Net income | $ 1,529 | $ 5,001 | $ 5,339 | $ 68
Net income per common share: |  |  |  |
Basic and diluted net income (loss) per common share from continuing operations | $ 0.02 | $ 0.01 | $ 0.07 | $ (0.05)
Basic and diluted net income per common share from discontinued operations |  | 0.06 |  | 0.05
Basic and diluted net income per common share | $ 0.02 | $ 0.07 | $ 0.07 | $ 0.00
Weighted average shares outstanding: |  |  |  |
Basic | 74,552,545 | 70,641,938 | 74,481,281 | 68,896,059
Diluted | 74,898,520 | 71,044,528 | 74,842,095 | 69,289,349

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