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OPERATING SEGMENT REPORTING - Geographic information (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Operating Segment Reporting |  |  |
Revenue | $ 117,019 | $ 128,175 | $ 67,465
Long-lived Assets | 539,150 | 557,565 |
Investment in MSC | 110,183 | 127,814 |
Operating Lease, Right-of-Use Asset | 1,000 |  |
MSC |  |  |
Operating Segment Reporting |  |  |
Revenue | 263,887 | 213,096 | 235,650
Investment in MSC | 110,183 | 127,814 | 150,064
Bank of Nova Scotia | Sales | Customer |  |  |
Operating Segment Reporting |  |  |
Revenue | $ 103,600 | $ 123,500 | $ 65,900
Gold and silver sales, percentage | 89.00% | 96.00% | 94.00%
United States |  |  |
Operating Segment Reporting |  |  |
Revenue | $ 43,847 |  |
Long-lived Assets | 135,854 | $ 127,617 |
Canada |  |  |
Operating Segment Reporting |  |  |
Revenue | 50,058 | 62,024 | $ 11,620
Long-lived Assets | 77,147 | 84,119 |
Canada | MSC |  |  |
Operating Segment Reporting |  |  |
Investment in MSC |  | 127,800 |
Mexico |  |  |
Operating Segment Reporting |  |  |
Revenue | 23,114 | 66,151 | $ 55,845
Long-lived Assets | 23,551 | 26,524 |
Argentina |  |  |
Operating Segment Reporting |  |  |
Long-lived Assets | 302,598 | $ 319,305 |
Argentina | MSC |  |  |
Operating Segment Reporting |  |  |
Investment in MSC | $ 110,200 |  |

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