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Fair Value Measurements - Summary of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Assets:    
Equity securities $ 12,120 $ 132,197
Fair Value, Recurring    
Assets:    
Assets 56,794 132,283
Liabilities:    
Total liabilities   1,374
Provisional metal sales contracts | Fair Value, Recurring    
Assets:    
Fair value of other derivative instruments, net 299 86
Liabilities:    
Fair value of derivative liability 10 162
Gold zero cost collars | Fair Value, Recurring    
Liabilities:    
Fair value of derivative liability   1,212
Gold Forwards | Fair Value, Recurring    
Assets:    
Fair value of other derivative instruments, net 12,343  
Equity Securities | Fair Value, Recurring    
Assets:    
Equity securities   132,197
Liabilities:    
Marketable securities including warrants 44,152  
Level 1 | Fair Value, Recurring    
Assets:    
Assets 43,893 132,197
Liabilities:    
Total liabilities   0
Level 1 | Provisional metal sales contracts | Fair Value, Recurring    
Assets:    
Fair value of other derivative instruments, net 0 0
Liabilities:    
Fair value of derivative liability 0 0
Level 1 | Gold zero cost collars | Fair Value, Recurring    
Liabilities:    
Fair value of derivative liability   0
Level 1 | Gold Forwards | Fair Value, Recurring    
Assets:    
Fair value of other derivative instruments, net 0  
Level 1 | Equity Securities | Fair Value, Recurring    
Assets:    
Equity securities   132,197
Liabilities:    
Marketable securities including warrants 43,893  
Level 2 | Fair Value, Recurring    
Assets:    
Assets 12,901 86
Liabilities:    
Total liabilities   1,374
Level 2 | Provisional metal sales contracts | Fair Value, Recurring    
Assets:    
Fair value of other derivative instruments, net 299 86
Liabilities:    
Fair value of derivative liability 10 162
Level 2 | Gold zero cost collars | Fair Value, Recurring    
Liabilities:    
Fair value of derivative liability   1,212
Level 2 | Gold Forwards | Fair Value, Recurring    
Assets:    
Fair value of other derivative instruments, net 12,343  
Level 2 | Equity Securities | Fair Value, Recurring    
Assets:    
Equity securities   0
Liabilities:    
Marketable securities including warrants 259  
Level 3   | Fair Value, Recurring    
Assets:    
Assets 0 0
Liabilities:    
Total liabilities   0
Level 3   | Provisional metal sales contracts | Fair Value, Recurring    
Assets:    
Fair value of other derivative instruments, net 0 0
Liabilities:    
Fair value of derivative liability 0 0
Level 3   | Gold zero cost collars | Fair Value, Recurring    
Liabilities:    
Fair value of derivative liability   0
Level 3   | Gold Forwards | Fair Value, Recurring    
Assets:    
Fair value of other derivative instruments, net 0  
Level 3   | Equity Securities | Fair Value, Recurring    
Assets:    
Equity securities   $ 0
Liabilities:    
Marketable securities including warrants $ 0