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ACQUISITIONS AND DIVESTITURES - Narrative (Details) $ / shares in Units, $ in Thousands |  |  |  |  |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 17, 2022 USD ($) | Jul. 06, 2022 USD ($) $ / shares shares | Apr. 14, 2022 USD ($) | Oct. 21, 2021 USD ($) | Sep. 16, 2020 USD ($) | Sep. 15, 2020 USD ($) shares | Dec. 31, 2022 USD ($) | Jun. 30, 2021 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Nov. 16, 2022 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Equity method investments |  |  |  |  |  |  | $ 395 |  | $ 395 | $ 4,918 |  |
Gain on acquisition of Kartaltepe |  |  |  |  |  |  |  |  | 81,852 | 0 | $ 0 |
Mineral properties, plant and equipment, net |  |  |  |  |  |  | 3,549,446 |  | 3,549,446 | 3,249,764 |  |
Deferred income tax liabilities |  |  |  |  |  |  | 342,401 |  | 342,401 | 338,788 |  |
Non-controlling interest |  |  |  |  |  |  | 546,462 |  | 546,462 | 514,661 |  |
Other operating expenses, net |  |  |  |  |  |  |  |  | 0 | 8,595 | 20,813 |
Gain (Loss) on Disposal, Statement of Income or Comprehensive Income [Extensible Enumeration] |  |  |  | Impairment of long-lived and other assets |  |  |  |  |  |  |  |
Pitarrilla Project | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Consideration in cash |  | $ 35,000 |  |  |  |  |  |  |  |  |  |
Consideration in equity |  | $ 25,600 |  |  |  |  |  |  |  |  |  |
Consideration in equity (in shares) | shares |  | 8,577,380 |  |  |  |  |  |  |  |  |  |
Share price (in dollars per share) | $ / shares |  | $ 2.99 |  |  |  |  |  |  |  |  |  |
Gain on sale of assets |  | $ 600 |  |  |  |  |  |  |  |  |  |
Pitarrilla Project | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Smelter |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Royalty fee, percentage |  | 1.25% |  |  |  |  |  |  |  |  |  |
Royalty Portfolio | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Consideration in cash |  |  |  | $ 87,900 |  |  |  |  |  |  |  |
Carrying value |  |  |  | 83,900 |  |  |  |  |  |  |  |
Loss on impairment |  |  |  |  |  |  |  | $ 22,300 |  |  |  |
Gain on disposal |  |  |  | 2,100 |  |  |  |  |  |  |  |
Transaction costs |  |  |  | $ 300 |  |  |  |  |  |  |  |
Royalty Portfolio | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Measurement Input, Discount Rate |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Deferred consideration, rate |  |  |  | 0.125 |  |  |  |  |  |  |  |
Alacer |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of voting interests acquired |  |  |  |  | 57.00% |  |  |  |  |  |  |
Percentage of voting interests held by former shareholders |  |  |  |  | 43.00% |  |  |  |  |  |  |
Consideration transferred |  |  |  |  |  | $ 2,200,000 |  |  |  |  |  |
Other operating expenses, net |  |  |  |  |  |  |  |  |  | $ 6,900 | 20,800 |
Severance and termination payments |  |  |  |  |  |  |  |  |  |  | 11,000 |
Revenue |  |  |  |  |  |  |  |  |  |  | 205,500 |
Net income |  |  |  |  |  |  |  |  |  |  | $ 24,100 |
Alacer | Common shares |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Equity interests issued and issuable, entity shares issued per acquiree, ratio |  |  |  |  | 0.3246 |  |  |  |  |  |  |
Equity interest issued or issuable, number of shares (in shares) | shares |  |  |  |  |  | 95,699,911 |  |  |  |  |  |
Consideration transferred |  |  |  |  | $ 2,179,647 |  |  |  |  |  |  |
Taiga Gold Corporation |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Asset acquisition, consideration transferred |  |  | $ 24,800 |  |  |  |  |  | 24,800 |  |  |
Asset acquisition, cash and equivalents |  |  | 4,700 |  |  |  |  |  | $ 4,700 |  |  |
Asset acquisition, exploration and evaluation assets |  |  | 27,800 |  |  |  |  |  |  |  |  |
Asset acquisition, deferred tax liability |  |  | $ 7,500 |  |  |  |  |  |  |  |  |
Kartaltepe |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gain on acquisition of Kartaltepe |  |  |  |  |  |  | $ 81,900 |  |  |  |  |
Variable interest entity, initial measurement, recognized identifiable assets acquired and liabilities assumed, net | $ 284,700 |  |  |  |  |  |  |  |  |  |  |
Kartaltepe | Lidya’s |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Non-controlling interest | $ 48,600 |  |  |  |  |  |  |  |  |  |  |
Ownership percentage by noncontrolling owners | 20.00% |  |  |  |  |  |  |  |  |  |  |
Kartaltepe | Variable Interest Entity, Primary Beneficiary |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage | 80.00% |  |  |  |  |  |  |  |  |  |  |
Anagold | Alacer |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage by parent |  |  |  |  | 80.00% |  |  |  |  |  |  |
Lidya’s | Alacer |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage by noncontrolling owners |  |  |  |  | 20.00% |  |  |  |  |  |  |
Kartaltepe |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Additional ownership percentage acquired | 30.00% |  |  |  |  |  | 30.00% |  | 30.00% |  |  |
Payments to acquire interest in joint venture | $ 150,000 |  |  |  |  |  |  |  | $ 150,000 |  |  |
Ownership percentage |  |  |  |  |  |  |  |  |  |  |  | 50.00%
Equity method investments |  |  |  |  |  |  |  |  |  |  |  | $ 4,200
Kartaltepe | Variable Interest Entity, Primary Beneficiary |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Mineral properties, plant and equipment, net | 361,600 |  |  |  |  |  |  |  |  |  |  |
Deferred income tax liabilities | $ 72,300 |  |  |  |  |  |  |  |  |  |  |

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