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OPERATING SEGMENT REPORTING - Geographic information (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Operating Segment Reporting |  |  |
Revenue | $ 128,822 | $ 67,724 | $ 60,388
Long-lived Assets | 557,565 | 505,265 |
Investment in MSC | 127,814 | 150,064 |
Capital Expenditures | 79,396 | 11,511 | 6,165
Bank of Nova Scotia | Sales | Customer |  |  |
Operating Segment Reporting |  |  |
Revenue | $ 123,500 | $ 65,900 | $ 58,100
Gold and silver sales, percentage | 96.00% | 94.00% | 96.00%
Canada |  |  |
Operating Segment Reporting |  |  |
Revenue | $ 62,641 | $ 11,879 |
Long-lived Assets | 84,119 | 85,179 |
Mexico |  |  |
Operating Segment Reporting |  |  |
Revenue | 66,151 | 55,845 | $ 60,388
Long-lived Assets | 26,524 | 35,446 |
United States |  |  |
Operating Segment Reporting |  |  |
Revenue | 30 |  |
Long-lived Assets | 127,617 | 43,086 |
Argentina |  |  |
Operating Segment Reporting |  |  |
Long-lived Assets | $ 319,305 | $ 341,554 |

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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. Includes the cash outflow from the purchase of mining and mining related assets during the period. + References No definition available. + Details
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