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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)

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