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OPERATING SEGMENT REPORTING - Summary of Reportable Operating Segments (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Operating Segment Reporting |  |
Revenue from gold and silver sales | $ 23,740 | $ 31,400
Depreciation and depletion | (5,137) | (6,698)
Gross (loss) profit | (4,986) | (3,685)
Advanced projects | (1,799) | (2,550)
Impairment of mineral property interests and plant and equipment (Note 8) |  | (83,805)
Loss from investment in Minera Santa Cruz S.A. | (574) | (2,676)
Segment loss | (12,315) | (96,506)
General and Administrative and other | (2,166) | (3,779)
Loss before income and mining taxes | (14,481) | (100,285)
Capital expenditures | 10,324 | 5,536
USA |  |
Operating Segment Reporting |  |
Depreciation and depletion | (1,741) | (3,862)
Gross (loss) profit | (2,405) | (6,577)
Advanced projects | (84) | (366)
Impairment of mineral property interests and plant and equipment (Note 8) |  | (83,805)
Segment loss | (3,353) | (91,557)
Capital expenditures | 757 | 1,807
Canada |  |
Operating Segment Reporting |  |
Depreciation and depletion | (3,395) | (2,748)
Gross (loss) profit | (1,490) | 2,784
Advanced projects | (623) | (1,066)
Segment loss | (5,547) | (687)
Capital expenditures | 9,567 | 3,729
Mexico |  |
Operating Segment Reporting |  |
Depreciation and depletion | (1) | (88)
Gross (loss) profit | (1,091) | 108
Advanced projects | (1,092) | (1,118)
Segment loss | (2,191) | (1,010)
MSC |  |
Operating Segment Reporting |  |
Loss from investment in Minera Santa Cruz S.A. | (574) | (2,676)
Segment loss | (574) | (2,676)
Los Azules |  |
Operating Segment Reporting |  |
Segment loss | (650) | (576)
Gold and silver sales |  |
Operating Segment Reporting |  |
Revenue from gold and silver sales | 23,740 | 31,400
Gold and silver sales | USA |  |
Operating Segment Reporting |  |
Revenue from gold and silver sales | 12,893 | 14,317
Gold and silver sales | Canada |  |
Operating Segment Reporting |  |
Revenue from gold and silver sales | 8,561 | 12,739
Gold and silver sales | Mexico |  |
Operating Segment Reporting |  |
Revenue from gold and silver sales | 2,286 | 4,344
Production costs applicable to sales |  |
Operating Segment Reporting |  |
Production costs applicable to sales | (23,589) | (28,387)
Production costs applicable to sales | USA |  |
Operating Segment Reporting |  |
Production costs applicable to sales | (13,557) | (17,032)
Production costs applicable to sales | Canada |  |
Operating Segment Reporting |  |
Production costs applicable to sales | (6,656) | (7,207)
Production costs applicable to sales | Mexico |  |
Operating Segment Reporting |  |
Production costs applicable to sales | (3,376) | (4,148)
Exploration |  |
Operating Segment Reporting |  |
Production costs applicable to sales | (4,956) | (3,790)
Exploration | USA |  |
Operating Segment Reporting |  |
Production costs applicable to sales | (864) | (809)
Exploration | Canada |  |
Operating Segment Reporting |  |
Production costs applicable to sales | (3,434) | (2,405)
Exploration | Mexico |  |
Operating Segment Reporting |  |
Production costs applicable to sales | (8) |
Exploration | Los Azules |  |
Operating Segment Reporting |  |
Production costs applicable to sales | $ (650) | $ (576)

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