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OTHER ASSETS - Narrative (Details) oz in Millions |  |  |  | 8 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
May 02, 2017 USD ($) shares | Nov. 01, 2016 USD ($) | Oct. 31, 2016 USD ($) oz shares | Dec. 31, 2017 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Other Assets1 [Abstract] |  |  |  |  |  |
Cash and security deposits from close down and restoration provisions |  |  |  | $ 1,895,000 | $ 1,895,000 | $ 1,877,000
Parral properties |  |  |  |  |  |
Disposal Groups, Including Discontinued Operations 1 [Line Items] |  |  |  |  |  |
Sale of assets, shares received as consideration | shares |  |  | 1,198,083 |  |  |
Sale of assets, value of equity received as consideration |  |  | $ 5,272,000 |  |  |
Sale of assets, proceeds from right to receive equity |  |  | $ 200,000 |  |  |
Sale of assets, silver from right to receive (in ounces) | oz |  |  | 1 |  |  |
Initial value of proceeds from right to receive equity |  |  | $ 1,091,000 |  |  |
Net smelter royalty, percentage |  |  | 1.00% |  |  |
Diablillos and M-18 properties |  |  |  |  |  |
Disposal Groups, Including Discontinued Operations 1 [Line Items] |  |  |  |  |  |
Sale of assets, value of equity received as consideration |  | $ 2,887,000 |  |  |  |
Proceeds from sale of assets |  | $ 1,100,000 |  |  | $ 250,000 |
Net smelter royalty, percentage |  | 1.00% |  |  |  |
Sale of assets, ownership percentage acquired as consideration |  | 19.90% |  |  |  |
Sale of assets, financing value |  | $ 5,000,000 |  |  |  |
Sale of assets, financing completed value |  | 3,992,000 |  |  |  |
Sale of assets, expected future proceeds from sale of assets |  | $ 13,000,000 |  |  |  |
Sale of assets, expected future period of proceeds from sale of assets |  | 4 years |  |  |  |
Sale of assets, expected future proceeds from sale of assets, initial value |  | $ 7,452,000 |  |  |  |
Discount rate used in current measurement of expected future proceeds from sale of assets |  | 20.00% |  |  |  |
Berenguela project |  |  |  |  |  |
Disposal Groups, Including Discontinued Operations 1 [Line Items] |  |  |  |  |  |
Sale of assets, shares received as consideration | shares | 145,881,177 |  |  |  |  |
Sale of assets, value of equity received as consideration | $ 1,098,000 |  |  |  |  |
Initial value of proceeds from right to receive equity | $ 520,000 |  |  |  |  |
Proceeds from sale of assets |  |  |  | $ 150,000 |  |
Net smelter royalty, percentage | 1.00% |  |  |  |  |
Sale of assets, expected future proceeds from sale of assets | $ 12,000,000 |  |  |  |  |
Sale of assets, expected future period of proceeds from sale of assets | 5 years |  |  |  |  |
Sale of assets, expected future proceeds from sale of assets, initial value | $ 6,726,000 |  |  |  |  |
Discount rate used in current measurement of expected future proceeds from sale of assets | 15.00% |  |  |  |  |

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