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MINERAL, ROYALTY AND OTHER INTERESTS (Narrative) (Details) $ in Thousands |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jan. 26, 2017 USD ($) | Dec. 31, 2017 USD ($) $ / item | Dec. 31, 2017 USD ($) yr $ / item | Dec. 31, 2016 USD ($) $ / item | Sep. 29, 2017 USD ($)
Disclosure Of Property Plant And Equipment And Exploration And Evaluation [line items] |  |  |  |  |
Proceeds from disposal of mineral, royalty and other interests |  |  | $ 3,600 | $ 5,617 |
Acquisition of mineral, royalty and other interests |  |  | 4,409 | 10,806 |
Impairment of mineral, royalty and other interests |  |  | $ 9,104 | $ 2,507 |
Chapada Mine [member] | Copper Commodity Type [member] |  |  |  |  |
Disclosure Of Property Plant And Equipment And Exploration And Evaluation [line items] |  |  |  |  |
Percentage of life of mine gold or relevant commodity |  | 4.20% | 4.20% |  |
Bombore [Member] | Gold Commodity Type [member] |  |  |  |  |
Disclosure Of Property Plant And Equipment And Exploration And Evaluation [line items] |  |  |  |  |
Proceeds from disposal of mineral, royalty and other interests | $ 3,600 |  |  |  |
Proceeds from sale of royalty interest percentage premium on original upfront payment | 20.00% |  |  |  |
Bachelor Lake [Member] |  |  |  |  |
Disclosure Of Property Plant And Equipment And Exploration And Evaluation [line items] |  |  |  |  |
Agreement election payment amount to reduce net smelter return percentage |  | $ 2,000 |  |  |
Other income |  |  | $ 3,000 |  |
Bachelor Lake [Member] | Gold Commodity Type [member] |  |  |  |  |
Disclosure Of Property Plant And Equipment And Exploration And Evaluation [line items] |  |  |  |  |
Percentage of life of mine gold or relevant commodity |  | 20.00% | 20.00% |  |
Threshold, maximum measurement weight commodity, purchased |  | 12,000 | 12,000 |  |
Net smelter return royalty percentage |  |  | 1.00% |  |
Net smelter return royalty percentage if agreement option exercised |  | 1.80% |  |  |
Metanor's Barry Project [member] | Gold Commodity Type [member] |  |  |  |  |
Disclosure Of Property Plant And Equipment And Exploration And Evaluation [line items] |  |  |  |  |
Net smelter return royalty percentage |  | 3.90% |  |  |
Coringa Project [member] |  |  |  |  |
Disclosure Of Property Plant And Equipment And Exploration And Evaluation [line items] |  |  |  |  |
Fair value assumption used for life of mine, years | yr |  |  | 5 |  |
Description of key assumptions on which management has based determination of fair value less costs of disposal |  |  | The recoverable amount of $3.4 million was determined using a discounted cash flow model in estimating the fair value less costs of disposal. Key assumptions used in the cash flow forecast were: a 5 year mine life, a long term gold price of $1,300 and a 6% discount rate. |  |
Fair value assumption commodity price used | $ / item |  | 1,300 | 1,300 |  |
Discount rate used in current measurement of fair value less costs of disposal |  | 6.00% | 6.00% |  |
Impairment of mineral, royalty and other interests |  |  | $ 4,500 |  |
Recoverable amount of asset or cash-generating unit |  | $ 3,400 | 3,400 |  |
Other Royalties [member] |  |  |  |  |
Disclosure Of Property Plant And Equipment And Exploration And Evaluation [line items] |  |  |  |  |
Discount rate used in current measurement of fair value less costs of disposal |  |  |  | 4.00% |
Impairment of mineral, royalty and other interests |  |  | $ 9,104 | $ 2,507 |
Other Royalties [member] | Gold Commodity Type [member] |  |  |  |  |
Disclosure Of Property Plant And Equipment And Exploration And Evaluation [line items] |  |  |  |  |
Fair value assumption commodity price used | $ / item |  |  |  | 1,300 |
Other Royalties Lacking Significant Progress [Member] |  |  |  |  |
Disclosure Of Property Plant And Equipment And Exploration And Evaluation [line items] |  |  |  |  |
Impairment of mineral, royalty and other interests |  |  |  | $ 1,400 |
Other Royalties within Royalty Portfolio [member] |  |  |  |  |
Disclosure Of Property Plant And Equipment And Exploration And Evaluation [line items] |  |  |  |  |
Impairment of mineral, royalty and other interests |  |  |  | $ 1,100 |
Emigrant Springs [member] |  |  |  |  |
Disclosure Of Property Plant And Equipment And Exploration And Evaluation [line items] |  |  |  |  |
Description of key assumptions on which management has based determination of fair value less costs of disposal |  |  | The recoverable amount of $0.5 million was determined using a discounted cash flow model in estimating the fair value less costs of disposal. Key assumptions used in the cash flow forecast were: a 1 - 3 year mine life, a long term gold price of $1,300 and a 4% discount rate. |  |
Fair value assumption commodity price used | $ / item |  | 1,300 | 1,300 |  |
Discount rate used in current measurement of fair value less costs of disposal |  | 4.00% | 4.00% |  |
Impairment of mineral, royalty and other interests |  |  | $ 4,600 |  |
Recoverable amount of asset or cash-generating unit |  | $ 500 | $ 500 |  |
Metanor Resources Incorporated [member] |  |  |  |  |
Disclosure Of Property Plant And Equipment And Exploration And Evaluation [line items] |  |  |  |  |
Fair value of shares received |  |  |  |  | $ 2,000
Bottom of range [member] | Emigrant Springs [member] |  |  |  |  |
Disclosure Of Property Plant And Equipment And Exploration And Evaluation [line items] |  |  |  |  |
Fair value assumption used for life of mine, years | yr |  |  | 1 |  |
Top of range [member] | Emigrant Springs [member] |  |  |  |  |
Disclosure Of Property Plant And Equipment And Exploration And Evaluation [line items] |  |  |  |  |
Fair value assumption used for life of mine, years | yr |  |  | 3 |  |
After 12,000 Ounces [member] | Bachelor Lake [Member] | Gold Commodity Type [member] |  |  |  |  |
Disclosure Of Property Plant And Equipment And Exploration And Evaluation [line items] |  |  |  |  |
Net smelter return royalty percentage |  | 3.90% |  |  |
Before 12,000 Ounces [member] | Bachelor Lake [Member] | Gold Commodity Type [member] |  |  |  |  |
Disclosure Of Property Plant And Equipment And Exploration And Evaluation [line items] |  |  |  |  |
Commodity purchase quantity per quarter |  | 1,500 |  |  |

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