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OPERATING SEGMENTS - Segment Reporting Information, by Segment (Details) | 12 Months Ended
--- | ---
Dec. 31, 2018 USD ($) segment | Dec. 31, 2017 USD ($)
Disclosure of operating segments [line items] |  |
Number of operating segments (in segments) | segment | 3 |
Revenue | $ 420,675,000 | $ 448,773,000
Cost of inventory | (245,111,000) | (242,998,000)
Depletion, depreciation and amortization | (98,719,000) | (102,416,000)
Export duties reversal (note 13) | 0 | 4,303,000
Restructuring costs (note 18) | 0 | (109,000)
Inventory (provision) reversal (note 7) | 0 | 5,710,000
Cost of sales | (343,830,000) | (335,510,000)
Income from mine operations | 76,845,000 | 113,263,000
Exploration, evaluation and reclamation expenses | (14,009,000) | (15,981,000)
Impairment reversal | 0 | 24,357,000
Operating income (loss) | 29,895,000 | 101,332,000
Income (loss) before income tax | 8,090,000 | 74,587,000
Total assets | 1,521,138,000 | 1,537,454,000
Non-current assets | 774,695,000 | 719,139,000
Total liabilities | (515,162,000) | (513,526,000)
Puna Operations Inc. |  |
Disclosure of operating segments [line items] |  |
Revenue | 13,077,000 | 12,361,000
Income from mine operations | (1,243,000) | 4,039,000
Puna Operations |  |
Disclosure of operating segments [line items] |  |
Inventory (provision) reversal (note 7) |  | 6,342,000
Operating segments | Marigold mine |  |
Disclosure of operating segments [line items] |  |
Revenue | 250,341,000 | 250,825,000
Cost of inventory | (143,380,000) | (129,176,000)
Depletion, depreciation and amortization | (56,748,000) | (54,983,000)
Export duties reversal (note 13) |  | 0
Restructuring costs (note 18) |  | 0
Inventory (provision) reversal (note 7) |  | 0
Cost of sales | (200,128,000) | (184,159,000)
Income from mine operations | 50,213,000 | 66,666,000
Exploration, evaluation and reclamation expenses | (769,000) | (1,875,000)
Impairment reversal |  | 0
Operating income (loss) | 43,399,000 | 64,935,000
Income (loss) before income tax | 26,239,000 | 63,959,000
Total assets | 478,187,000 | 436,815,000
Non-current assets | 235,242,000 | 222,800,000
Total liabilities | (79,210,000) | (73,526,000)
Operating segments | Seabee Gold Operation |  |
Disclosure of operating segments [line items] |  |
Revenue | 115,655,000 | 108,334,000
Cost of inventory | (46,054,000) | (51,683,000)
Depletion, depreciation and amortization | (38,818,000) | (40,375,000)
Export duties reversal (note 13) |  | 0
Restructuring costs (note 18) |  | 0
Inventory (provision) reversal (note 7) |  | (632,000)
Cost of sales | (84,872,000) | (92,690,000)
Income from mine operations | 30,783,000 | 15,644,000
Exploration, evaluation and reclamation expenses | (7,703,000) | (5,050,000)
Impairment reversal |  | 0
Operating income (loss) | 20,657,000 | 10,594,000
Income (loss) before income tax | 20,204,000 | 10,126,000
Total assets | 448,891,000 | 418,210,000
Non-current assets | 321,802,000 | 346,647,000
Total liabilities | (93,017,000) | (92,050,000)
Operating segments | Puna Operations |  |
Disclosure of operating segments [line items] |  |
Revenue | 54,679,000 | 89,614,000
Cost of inventory | (55,677,000) | (62,139,000)
Depletion, depreciation and amortization | (3,153,000) | (7,058,000)
Export duties reversal (note 13) |  | 4,303,000
Restructuring costs (note 18) |  | (109,000)
Inventory (provision) reversal (note 7) |  | 6,342,000
Cost of sales | (58,830,000) | (58,661,000)
Income from mine operations | (4,151,000) | 30,953,000
Exploration, evaluation and reclamation expenses | 919,000 | (324,000)
Impairment reversal |  | 24,357,000
Operating income (loss) | (8,457,000) | 52,788,000
Income (loss) before income tax | (9,066,000) | 46,379,000
Total assets | 185,298,000 | 200,590,000
Non-current assets | 121,890,000 | 77,112,000
Total liabilities | (62,243,000) | (77,850,000)
Operating segments | Exploration, evaluation and development properties |  |
Disclosure of operating segments [line items] |  |
Revenue | 0 | 0
Cost of inventory | 0 | 0
Depletion, depreciation and amortization | 0 | 0
Export duties reversal (note 13) |  | 0
Restructuring costs (note 18) |  | 0
Inventory (provision) reversal (note 7) |  | 0
Cost of sales | 0 | 0
Income from mine operations | 0 | 0
Exploration, evaluation and reclamation expenses | (2,857,000) | (8,357,000)
Impairment reversal |  | 0
Operating income (loss) | (2,801,000) | (8,360,000)
Income (loss) before income tax | (2,751,000) | (14,840,000)
Total assets | 71,830,000 | 72,825,000
Non-current assets | 69,263,000 | 71,782,000
Total liabilities | (6,330,000) | (6,496,000)
Other reconciling items |  |
Disclosure of operating segments [line items] |  |
Revenue | 0 | 0
Cost of inventory | 0 | 0
Depletion, depreciation and amortization | 0 | 0
Export duties reversal (note 13) |  | 0
Restructuring costs (note 18) |  | 0
Inventory (provision) reversal (note 7) |  | 0
Cost of sales | 0 | 0
Income from mine operations | 0 | 0
Exploration, evaluation and reclamation expenses | (3,599,000) | (375,000)
Impairment reversal |  | 0
Operating income (loss) | (22,903,000) | (18,625,000)
Income (loss) before income tax | (26,536,000) | (31,037,000)
Total assets | 336,932,000 | 409,014,000
Non-current assets | 26,498,000 | 798,000
Total liabilities | $ (274,362,000) | $ (263,604,000)

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