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Discontinued Operations - Results of discontinued operations (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2020
Discontinued Operations |  |
Sales, net | $ 15,851 | $ 30,284
Mine cost of sales | 10,714 | 25,872
Mine gross profit | 5,137 | 4,412
Exploration expenses | 780 | 1,373
Other expense, net | 62 | 172
Profit before income taxes | 4,295 | 2,867
Income tax benefit | (957) | (413)
Net income from discontinued operations, net of income taxes | $ 5,252 | $ 3,280

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