v3.25.2
MINERAL PROPERTIES - Schedule of mineral property acquisition costs (Details) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended 27 Months Ended
Jun. 30, 2025
Dec. 31, 2024
May 31, 2015
Oil and Gas, Cost Incurred, Property Acquisition, Exploration, and Development [Line Items]      
Beginning Balance $ 7,902 $ 7,647  
Acquisition costs 356 486  
Paid by Nuton LLC (131) (231)  
Total additions for the period 225 255  
Ending Balance 8,127 7,902  
Bear Deposit [Member]      
Oil and Gas, Cost Incurred, Property Acquisition, Exploration, and Development [Line Items]      
Acquisition costs     $ 5,765
Singatse Peak Services [Member] | MacArthur [Member]      
Oil and Gas, Cost Incurred, Property Acquisition, Exploration, and Development [Line Items]      
Beginning Balance 2,489 2,489  
Acquisition costs 0 0  
Paid by Nuton LLC 0 0  
Total additions for the period 0 0  
Ending Balance 2,489 2,489  
Singatse Peak Services [Member] | Yerington [Member]      
Oil and Gas, Cost Incurred, Property Acquisition, Exploration, and Development [Line Items]      
Beginning Balance 1,195 1,195  
Acquisition costs 0 0  
Paid by Nuton LLC 0 0  
Total additions for the period 0 0  
Ending Balance 1,195 1,195  
Singatse Peak Services [Member] | Bear Deposit [Member]      
Oil and Gas, Cost Incurred, Property Acquisition, Exploration, and Development [Line Items]      
Beginning Balance 1,575 1,575  
Acquisition costs 131 231  
Paid by Nuton LLC (131) (231)  
Total additions for the period 0 0  
Ending Balance 1,575 1,575  
Singatse Peak Services [Member] | Wassuk [Member]      
Oil and Gas, Cost Incurred, Property Acquisition, Exploration, and Development [Line Items]      
Beginning Balance 1,405 1,405  
Acquisition costs 0 0  
Paid by Nuton LLC 0 0  
Total additions for the period 0 0  
Ending Balance 1,405 1,405  
Singatse Peak Services [Member] | Copper Canyon [Member]      
Oil and Gas, Cost Incurred, Property Acquisition, Exploration, and Development [Line Items]      
Beginning Balance 10 10  
Acquisition costs 0 0  
Paid by Nuton LLC 0 0  
Total additions for the period 0 0  
Ending Balance 10 10  
Falcon Copper Corp ("FCC") [Member] | Blue Copper [Member]      
Oil and Gas, Cost Incurred, Property Acquisition, Exploration, and Development [Line Items]      
Beginning Balance 1,028 878  
Acquisition costs 225 150  
Paid by Nuton LLC 0 0  
Total additions for the period 225 150  
Ending Balance 1,253 1,028  
Falcon Copper Corp ("FCC") [Member] | Muncy [Member]      
Oil and Gas, Cost Incurred, Property Acquisition, Exploration, and Development [Line Items]      
Beginning Balance 200 95  
Acquisition costs 0 105  
Paid by Nuton LLC 0 0  
Total additions for the period 0 105  
Ending Balance $ 200 $ 200