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Mineral Properties - Awak Mas (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jan. 28, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Property, Plant and Equipment [Line Items]          
Gain (Loss) On Disposal Of Mineral Property Interests, Net   $ 2,100 $ 2,883 $ 2,100  
PT Masmindo Dwi Area | Awak Mas          
Property, Plant and Equipment [Line Items]          
NSR Cancellation Proceeds $ 2,500        
Disposal Group, Deferred Gain on Disposal         $ 383
Gain (Loss) On Disposal Of Mineral Property Interests, Net     $ 2,883