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OPERATING SEGMENTS - Segment Reporting Information, by Segment (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
USD ($)
segment
Dec. 31, 2016
USD ($)
Disclosure of operating segments [line items]    
Number of operating segments (in segments) | segment 3  
Revenue $ 448,773 $ 490,986
Cost of inventory (242,998) (250,506)
Depletion, depreciation and amortization (102,416) (75,569)
Export duties 4,303 (1,512)
Restructuring costs (109) (5,692)
Inventory (provision) reversal (note 7) 5,710 (3,701)
Cost of sales (335,510) (336,980)
Income from mine operations 113,263 154,006
Exploration, evaluation and reclamation expenses (15,981) (14,553)
Impairment reversal 24,357 0
Operating income (loss) 101,332 112,605
Income (loss) before income tax 74,587 80,985
Total assets 1,537,454 1,438,688
Non-current assets 719,139 721,956
Total liabilities (513,526) (536,809)
Puna Operations Inc.    
Disclosure of operating segments [line items]    
Revenue 12,361 0
Income from mine operations 4,039 0
Operating segments | Marigold mine    
Disclosure of operating segments [line items]    
Revenue 250,825 256,817
Cost of inventory (129,176) (131,821)
Depletion, depreciation and amortization (54,983) (44,324)
Export duties 0 0
Restructuring costs 0 0
Inventory (provision) reversal (note 7) 0 0
Cost of sales (184,159) (176,145)
Income from mine operations 66,666 80,672
Exploration, evaluation and reclamation expenses (1,875) (1,339)
Impairment reversal 0  
Operating income (loss) 64,935 79,384
Income (loss) before income tax 63,959 73,705
Total assets 436,815 394,963
Non-current assets 222,800 253,373
Total liabilities (73,526) (75,101)
Operating segments | Seabee Gold Operation    
Disclosure of operating segments [line items]    
Revenue 108,334 64,826
Cost of inventory (51,683) (40,178)
Depletion, depreciation and amortization (40,375) (16,442)
Export duties 0 0
Restructuring costs 0 0
Inventory (provision) reversal (note 7) (632) 0
Cost of sales (92,690) (56,620)
Income from mine operations 15,644 8,206
Exploration, evaluation and reclamation expenses (5,050) (1,040)
Impairment reversal 0  
Operating income (loss) 10,594 6,763
Income (loss) before income tax 10,126 7,302
Total assets 418,210 420,796
Non-current assets 346,647 370,141
Total liabilities (92,050) (91,627)
Operating segments | Puna Operations    
Disclosure of operating segments [line items]    
Revenue 89,614 169,343
Cost of inventory (62,139) (78,507)
Depletion, depreciation and amortization (7,058) (14,803)
Export duties 4,303 (1,512)
Restructuring costs (109) (5,692)
Inventory (provision) reversal (note 7) 6,342 (3,701)
Cost of sales (58,661) (104,215)
Income from mine operations 30,953 65,128
Exploration, evaluation and reclamation expenses (324) 1,817
Impairment reversal 24,357  
Operating income (loss) 52,788 65,768
Income (loss) before income tax 46,379 52,104
Total assets 200,590 94,876
Non-current assets 77,112 26,007
Total liabilities (77,850) (117,091)
Operating segments | Exploration and evaluation properties    
Disclosure of operating segments [line items]    
Revenue 0 0
Cost of inventory 0 0
Depletion, depreciation and amortization 0 0
Export duties 0 0
Restructuring costs 0 0
Inventory (provision) reversal (note 7) 0 0
Cost of sales 0 0
Income from mine operations 0 0
Exploration, evaluation and reclamation expenses (8,357) (13,649)
Impairment reversal 0  
Operating income (loss) (8,360) (13,708)
Income (loss) before income tax (14,840) (19,295)
Total assets 72,825 84,184
Non-current assets 71,782 71,441
Total liabilities (6,496) (7,146)
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 0 0
Restructuring costs 0 0
Inventory (provision) reversal (note 7) 0 0
Cost of sales 0 0
Income from mine operations 0 0
Exploration, evaluation and reclamation expenses (375) (342)
Impairment reversal 0  
Operating income (loss) (18,625) (25,602)
Income (loss) before income tax (31,037) (32,831)
Total assets 409,014 443,869
Non-current assets 798 994
Total liabilities $ (263,604) $ (245,844)