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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)