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ACQUISITIONS AND CHANGE IN INTEREST ON MINERAL PROPERTIES - Narrative (Details) |  |  |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2017 USD ($) $ / $ $ / ounce | May 31, 2017 USD ($) | May 30, 2016 CAD ($) | Mar. 07, 2016 CAD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Mar. 31, 2017 | May 31, 2016 $ / shares | May 31, 2016 USD ($)
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |
Payments for interest in joint venture |  |  |  |  | $ 12,972,000 | $ 0 |  |  |
Property, plant and equipment | $ 658,629,000 |  |  |  | 658,629,000 | 663,828,000 |  |  |
Non-controlling interest | 23,043,000 |  |  |  | 23,043,000 | 0 |  |  |
Equity attributable to our shareholders |  |  |  |  | 17,231,000 |  |  |  |
Business acquisition costs |  |  |  |  | 0 | 4,757,000 |  |  |
Goodwill | $ 49,786,000 |  |  |  | $ 49,786,000 | 49,786,000 |  |  |
Discount rate applied to cash flow projections |  |  |  |  |  |  | 20.00% |  |
Seabee Gold Operation |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |
Commodity price applied to cash flow projections (in USD per ounce) | $ / ounce | 1,300 |  |  |  |  |  |  |  |
Foreign exchange rate applied to cash flow projections (in CAD per USD) | $ / $ | 0.8000 |  |  |  |  |  |  |  |
Discount rate applied to cash flow projections | 7.00% |  |  |  | 7.00% |  |  |  |
Claude Resources Inc. |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |
Total purchase price |  |  |  |  |  |  |  |  | $ 329,402,000
Ratio of shares transferred per common share |  |  |  |  |  |  |  |  | 0.185
Cash transferred per common share (in CAD per share) | $ / shares |  |  |  |  |  |  |  | $ 0.001 |
Business acquisition costs |  |  |  |  |  | 4,757,000 |  |  |
Goodwill |  |  |  |  |  |  |  |  | $ 49,786,000
Transaction share price |  |  | $ 11.35 | $ 7.89 |  |  |  |  |
Revenue of combined entity as if combination occurred at beginning of period |  |  |  |  |  | 522,452,000 |  |  |
Net income of combined entity as if combination occurred at beginning of period |  |  |  |  |  | 64,644,000 |  |  |
Puna Operations Inc. |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |
Proportion of ownership interest in joint venture |  | 75.00% |  |  |  |  |  |  |
Useful life of property, plant and equipment |  | 8 years |  |  | 8 years |  |  |  |
Payments for interest in joint venture |  | $ 12,972,000 |  |  |  |  |  |  |
Property, plant and equipment |  | 28,839,000 |  |  |  |  |  |  |
Non-controlling interest |  | 18,573,000 |  |  |  |  |  |  |
Other |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |
Equity attributable to our shareholders |  |  |  |  | $ (1,342,000) | $ 0 |  |  |
Other | Puna Operations Inc. |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |
Equity attributable to our shareholders |  | $ (1,342,000) |  |  |  |  |  |  |

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