v3.26.1
MINERAL PROPERTIES - Schedule of mineral property acquisition costs (Details) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended 27 Months Ended
Jun. 30, 2026
Dec. 31, 2025
May 31, 2015
Oil and Gas, Cost Incurred, Property Acquisition, Exploration, and Development [Line Items]      
Beginning Balance $ 7,986 $ 7,902  
Acquisition 2,839 1,312  
Option payments 1,666 553  
Funded by Nuton LLC (4,505) (231)  
Deconsolidation of Falcon Copper Corp.   (1,550)  
Total additions (disposals) for the year 0 84  
Ending Balance 7,986 7,986  
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 0 0  
Option payments 0 0  
Funded by Nuton LLC 0 0  
Deconsolidation of Falcon Copper Corp.   0  
Total additions (disposals) for the year 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 33 0  
Option payments 100 0  
Funded by Nuton LLC (133) 0  
Deconsolidation of Falcon Copper Corp.   0  
Total additions (disposals) for the year 0 0  
Ending Balance 1,195 1,195  
Singatse Peak Services [Member] | Bear [Member]      
Oil and Gas, Cost Incurred, Property Acquisition, Exploration, and Development [Line Items]      
Beginning Balance 2,887 1,575  
Acquisition 2,806 1,312 $ 5,966
Option payments 1,566 231  
Funded by Nuton LLC (4,372) (231)  
Deconsolidation of Falcon Copper Corp.   0  
Total additions (disposals) for the year 0 1,312  
Ending Balance 2,887 2,887  
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 0 0  
Option payments 0 0  
Funded by Nuton LLC 0 0  
Deconsolidation of Falcon Copper Corp.   0  
Total additions (disposals) for the year 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 0 0  
Option payments 0 0  
Funded by Nuton LLC 0 0  
Deconsolidation of Falcon Copper Corp.   0  
Total additions (disposals) for the year 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 0 1,028  
Acquisition 0 0  
Option payments 0 225  
Funded by Nuton LLC 0 0  
Deconsolidation of Falcon Copper Corp.   (1,253)  
Total additions (disposals) for the year 0 (1,028)  
Ending Balance 0 0  
Falcon Copper Corp ("FCC") [Member] | Schell Creek [Member]      
Oil and Gas, Cost Incurred, Property Acquisition, Exploration, and Development [Line Items]      
Beginning Balance 0 200  
Acquisition 0 0  
Option payments 0 50  
Funded by Nuton LLC 0 0  
Deconsolidation of Falcon Copper Corp.   (250)  
Total additions (disposals) for the year 0 (200)  
Ending Balance 0 0  
Falcon Copper Corp ("FCC") [Member] | Groundhog [Member]      
Oil and Gas, Cost Incurred, Property Acquisition, Exploration, and Development [Line Items]      
Beginning Balance 0 0  
Acquisition 0 0  
Option payments 0 47  
Funded by Nuton LLC 0 0  
Deconsolidation of Falcon Copper Corp.   (47)  
Total additions (disposals) for the year 0 0  
Ending Balance $ 0 $ 0