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OTHER NON-CURRENT LIABILITIES - Narrative (Details) ozt in Thousands, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 USD ($) $ / ounce ozt | Sep. 29, 2015 USD ($)
Pueblo Viejo |  |
Disclosure of Detailed Information About Other Noncurrent Liabilities [Line Items] |  |
Economic interest in subsidiary | 60.00% |
Royal Gold |  |
Disclosure of Detailed Information About Other Noncurrent Liabilities [Line Items] |  |
Expected initial revenue payments (as percent) | 30.00% |
Expected revenue payment from contracts with customers, as percent of prevailing spot prices on volume of mineral resources in deliveries thereafter (as percent) | 60.00% |
Royal Gold | Pueblo Viejo |  |
Disclosure of Detailed Information About Other Noncurrent Liabilities [Line Items] |  |
Deposits from customers | $ |  | $ 610
Silver | Royal Gold |  |
Disclosure of Detailed Information About Other Noncurrent Liabilities [Line Items] |  |
Threshold delivery volume (in ounces) | 23,100 |
Silver | Royal Gold | Pueblo Viejo |  |
Disclosure of Detailed Information About Other Noncurrent Liabilities [Line Items] |  |
Percent of interest in mineral resource production sold until initial delivery maximum achieved (as percent) | 75.00% |
Initial delivery maximum (in ounces) | 50,000 |
Percent of interest in mineral resource production to be delivered thereafter (as percent) | 37.50% |
Fixed recovery rate (as percent) | 70.00% |
Silver | Pascua-Lama | Silver Wheaton Corp. |  |
Disclosure of Detailed Information About Other Noncurrent Liabilities [Line Items] |  |
Goods deliverable under contract (as percent) | 25.00% |
Deposits from customers | $ | $ 625 |
Contract duration | 3 years |
Selling price (in dollars per ounce) | $ / ounce | 3.90 |
Annual inflation adjustment (as percent) | 1.00% |
Starting period after project period to apply annual inflation adjustment | 3 years |
Gold | Royal Gold |  |
Disclosure of Detailed Information About Other Noncurrent Liabilities [Line Items] |  |
Threshold delivery volume (in ounces) | 550 |
Gold | Royal Gold | Pueblo Viejo |  |
Disclosure of Detailed Information About Other Noncurrent Liabilities [Line Items] |  |
Percent of interest in mineral resource production sold until initial delivery maximum achieved (as percent) | 7.50% |
Initial delivery maximum (in ounces) | 990 |
Percent of interest in mineral resource production to be delivered thereafter (as percent) | 3.75% |
Lagunas Norte, Pierina and Veladero | Silver | Silver Wheaton Corp. |  |
Disclosure of Detailed Information About Other Noncurrent Liabilities [Line Items] |  |
Goods deliverable under contract (as percent) | 100.00% |

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