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ACQUISITIONS AND DIVESTITURES - Divestitures (Details)
$ / shares in Units, $ in Thousands
 6 Months Ended 12 Months Ended
Dec. 22, 2023
USD ($)
right
shares
Jul. 06, 2022
USD ($)
$ / shares
shares
Oct. 21, 2021
USD ($)
Jun. 30, 2021
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Mar. 31, 2024
USD ($)
Dec. 22, 2023
$ / shares
Business Acquisition [Line Items]                  
Asset acquisition, deferred tax liability         $ 687 $ 0      
Gain on sale of assets         (762) $ 746 $ 0    
Gain (Loss) on Disposal, Statement of Income or Comprehensive Income [Extensible Enumeration]     Impairment charges            
EMX Common Share                  
Business Acquisition [Line Items]                  
Liabilities held for sale         1,431        
EMX Common Share | Level 2                  
Business Acquisition [Line Items]                  
Liabilities held for sale         1,431        
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 (as a percent)   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 (loss) on disposal     2,100            
Transaction costs     $ 300            
Royalty Portfolio | Disposal Group, Disposed of by Sale, Not Discontinued Operations | EMX Common Share | Secondary Offering                  
Business Acquisition [Line Items]                  
Gain (loss) on disposal $ (2,900)                
Sale of stock, number of shares issued in transaction (in shares) | shares 6,161,524                
Sale of stock, price (in canadian dollars per share) | $ / shares                 $ 1.93
Conversion ratio | shares 1                
Number of rights to purchase additional shares | right 1                
Sale of stock, option, price per share (in canadian dollars per share) | $ / shares                 $ 2.27
Proceeds from fees received $ 8,700                
Royalty Portfolio | Disposal Group, Disposed of by Sale, Not Discontinued Operations | EMX Common Share | Secondary Offering | Level 2                  
Business Acquisition [Line Items]                  
Liabilities held for sale $ 1,400                
Royalty Portfolio | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Measurement Input, Discount Rate                  
Business Acquisition [Line Items]                  
Deferred consideration, rate (as a percent)     0.125            
San Luis Project | Disposal Group, Held-for-Sale, Not Discontinued Operations                  
Business Acquisition [Line Items]                  
Asset acquisition, exploration and evaluation assets         800        
Asset acquisition, deferred tax liability         $ 700        
San Luis Project | Disposal Group, Held-for-Sale, Not Discontinued Operations | Forecast                  
Business Acquisition [Line Items]                  
Consideration in cash               $ 5,000  
Contingent payment               $ 37,500  
San Luis Project | Disposal Group, Held-for-Sale, Not Discontinued Operations | Smelter | Forecast                  
Business Acquisition [Line Items]                  
Royalty fee (as a percent)               4.00%