v3.26.1
MINERAL PROPERTIES - Schedule of exploration expenditures recorded on the statement of loss and comprehensive loss (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Oil and Gas, Cost Incurred, Property Acquisition, Exploration, and Development [Line Items]        
Exploration expenditures $ 4,144 $ 987 $ 5,078 $ 2,150
Property Maintenance [Member]        
Oil and Gas, Cost Incurred, Property Acquisition, Exploration, and Development [Line Items]        
Exploration expenditures 5 13 5 67
Assay & Labs [Member]        
Oil and Gas, Cost Incurred, Property Acquisition, Exploration, and Development [Line Items]        
Exploration expenditures 138 21 205 30
Drilling [Member]        
Oil and Gas, Cost Incurred, Property Acquisition, Exploration, and Development [Line Items]        
Exploration expenditures 199 0 283 119
Environmental [Member]        
Oil and Gas, Cost Incurred, Property Acquisition, Exploration, and Development [Line Items]        
Exploration expenditures 1,421 88 1,860 239
Geological [Member]        
Oil and Gas, Cost Incurred, Property Acquisition, Exploration, and Development [Line Items]        
Exploration expenditures 34   34  
Geophysical [Member]        
Oil and Gas, Cost Incurred, Property Acquisition, Exploration, and Development [Line Items]        
Exploration expenditures 59 1 60 11
Technical Study [Member]        
Oil and Gas, Cost Incurred, Property Acquisition, Exploration, and Development [Line Items]        
Exploration expenditures 1,915 840 2,229 1,640
Field Support [Member]        
Oil and Gas, Cost Incurred, Property Acquisition, Exploration, and Development [Line Items]        
Exploration expenditures 373 24 402 44
Nuton LLC [Member]        
Oil and Gas, Cost Incurred, Property Acquisition, Exploration, and Development [Line Items]        
Exploration expenditures (4,144) (963) (5,078) (2,051)
Lion CG [Member]        
Oil and Gas, Cost Incurred, Property Acquisition, Exploration, and Development [Line Items]        
Exploration expenditures 0 24 0 99
Singatse Peak Services [Member] | MacArthur [Member]        
Oil and Gas, Cost Incurred, Property Acquisition, Exploration, and Development [Line Items]        
Exploration expenditures 31 27 42 60
Singatse Peak Services [Member] | MacArthur [Member] | Property Maintenance [Member]        
Oil and Gas, Cost Incurred, Property Acquisition, Exploration, and Development [Line Items]        
Exploration expenditures 0 6 0 6
Singatse Peak Services [Member] | MacArthur [Member] | Assay & Labs [Member]        
Oil and Gas, Cost Incurred, Property Acquisition, Exploration, and Development [Line Items]        
Exploration expenditures 0 0 0 0
Singatse Peak Services [Member] | MacArthur [Member] | Drilling [Member]        
Oil and Gas, Cost Incurred, Property Acquisition, Exploration, and Development [Line Items]        
Exploration expenditures 0 0 0 0
Singatse Peak Services [Member] | MacArthur [Member] | Environmental [Member]        
Oil and Gas, Cost Incurred, Property Acquisition, Exploration, and Development [Line Items]        
Exploration expenditures 0 0 0 1
Singatse Peak Services [Member] | MacArthur [Member] | Geological [Member]        
Oil and Gas, Cost Incurred, Property Acquisition, Exploration, and Development [Line Items]        
Exploration expenditures 0   0  
Singatse Peak Services [Member] | MacArthur [Member] | Geophysical [Member]        
Oil and Gas, Cost Incurred, Property Acquisition, Exploration, and Development [Line Items]        
Exploration expenditures 25 0 25 0
Singatse Peak Services [Member] | MacArthur [Member] | Technical Study [Member]        
Oil and Gas, Cost Incurred, Property Acquisition, Exploration, and Development [Line Items]        
Exploration expenditures 0 21 0 53
Singatse Peak Services [Member] | MacArthur [Member] | Field Support [Member]        
Oil and Gas, Cost Incurred, Property Acquisition, Exploration, and Development [Line Items]        
Exploration expenditures 6 0 17 0
Singatse Peak Services [Member] | MacArthur [Member] | Nuton LLC [Member]        
Oil and Gas, Cost Incurred, Property Acquisition, Exploration, and Development [Line Items]        
Exploration expenditures (31) (27) (42) (60)
Singatse Peak Services [Member] | MacArthur [Member] | Lion CG [Member]        
Oil and Gas, Cost Incurred, Property Acquisition, Exploration, and Development [Line Items]        
Exploration expenditures 0 0 0 0
Singatse Peak Services [Member] | Yerington [Member]        
Oil and Gas, Cost Incurred, Property Acquisition, Exploration, and Development [Line Items]        
Exploration expenditures 4,112 912 5,016 1,961
Singatse Peak Services [Member] | Yerington [Member] | Property Maintenance [Member]        
Oil and Gas, Cost Incurred, Property Acquisition, Exploration, and Development [Line Items]        
Exploration expenditures 5 0 5 0
Singatse Peak Services [Member] | Yerington [Member] | Assay & Labs [Member]        
Oil and Gas, Cost Incurred, Property Acquisition, Exploration, and Development [Line Items]        
Exploration expenditures 138 1 205 10
Singatse Peak Services [Member] | Yerington [Member] | Drilling [Member]        
Oil and Gas, Cost Incurred, Property Acquisition, Exploration, and Development [Line Items]        
Exploration expenditures 199 0 283 119
Singatse Peak Services [Member] | Yerington [Member] | Environmental [Member]        
Oil and Gas, Cost Incurred, Property Acquisition, Exploration, and Development [Line Items]        
Exploration expenditures 1,421 88 1,860 238
Singatse Peak Services [Member] | Yerington [Member] | Geological [Member]        
Oil and Gas, Cost Incurred, Property Acquisition, Exploration, and Development [Line Items]        
Exploration expenditures 34   34  
Singatse Peak Services [Member] | Yerington [Member] | Geophysical [Member]        
Oil and Gas, Cost Incurred, Property Acquisition, Exploration, and Development [Line Items]        
Exploration expenditures 34 0 35 0
Singatse Peak Services [Member] | Yerington [Member] | Technical Study [Member]        
Oil and Gas, Cost Incurred, Property Acquisition, Exploration, and Development [Line Items]        
Exploration expenditures 1,914 817 2,210 1,580
Singatse Peak Services [Member] | Yerington [Member] | Field Support [Member]        
Oil and Gas, Cost Incurred, Property Acquisition, Exploration, and Development [Line Items]        
Exploration expenditures 367 6 384 14
Singatse Peak Services [Member] | Yerington [Member] | Nuton LLC [Member]        
Oil and Gas, Cost Incurred, Property Acquisition, Exploration, and Development [Line Items]        
Exploration expenditures (4,112) (912) (5,016) (1,961)
Singatse Peak Services [Member] | Yerington [Member] | Lion CG [Member]        
Oil and Gas, Cost Incurred, Property Acquisition, Exploration, and Development [Line Items]        
Exploration expenditures 0 0 0 0
Singatse Peak Services [Member] | Bear [Member]        
Oil and Gas, Cost Incurred, Property Acquisition, Exploration, and Development [Line Items]        
Exploration expenditures 1 24 20 29
Singatse Peak Services [Member] | Bear [Member] | Property Maintenance [Member]        
Oil and Gas, Cost Incurred, Property Acquisition, Exploration, and Development [Line Items]        
Exploration expenditures 0 0 0 0
Singatse Peak Services [Member] | Bear [Member] | Assay & Labs [Member]        
Oil and Gas, Cost Incurred, Property Acquisition, Exploration, and Development [Line Items]        
Exploration expenditures 0 20 0 20
Singatse Peak Services [Member] | Bear [Member] | Drilling [Member]        
Oil and Gas, Cost Incurred, Property Acquisition, Exploration, and Development [Line Items]        
Exploration expenditures 0 0 0 0
Singatse Peak Services [Member] | Bear [Member] | Environmental [Member]        
Oil and Gas, Cost Incurred, Property Acquisition, Exploration, and Development [Line Items]        
Exploration expenditures 0 0 0 0
Singatse Peak Services [Member] | Bear [Member] | Geological [Member]        
Oil and Gas, Cost Incurred, Property Acquisition, Exploration, and Development [Line Items]        
Exploration expenditures 0   0  
Singatse Peak Services [Member] | Bear [Member] | Geophysical [Member]        
Oil and Gas, Cost Incurred, Property Acquisition, Exploration, and Development [Line Items]        
Exploration expenditures 0 0 0 0
Singatse Peak Services [Member] | Bear [Member] | Technical Study [Member]        
Oil and Gas, Cost Incurred, Property Acquisition, Exploration, and Development [Line Items]        
Exploration expenditures 1 2 19 7
Singatse Peak Services [Member] | Bear [Member] | Field Support [Member]        
Oil and Gas, Cost Incurred, Property Acquisition, Exploration, and Development [Line Items]        
Exploration expenditures 0 2 1 2
Singatse Peak Services [Member] | Bear [Member] | Nuton LLC [Member]        
Oil and Gas, Cost Incurred, Property Acquisition, Exploration, and Development [Line Items]        
Exploration expenditures (1) (24) (20) (29)
Singatse Peak Services [Member] | Bear [Member] | Lion CG [Member]        
Oil and Gas, Cost Incurred, Property Acquisition, Exploration, and Development [Line Items]        
Exploration expenditures 0 0 0 0
Singatse Peak Services [Member] | Wassuk [Member]        
Oil and Gas, Cost Incurred, Property Acquisition, Exploration, and Development [Line Items]        
Exploration expenditures 0 0 0 1
Singatse Peak Services [Member] | Wassuk [Member] | Property Maintenance [Member]        
Oil and Gas, Cost Incurred, Property Acquisition, Exploration, and Development [Line Items]        
Exploration expenditures 0 0 0 1
Singatse Peak Services [Member] | Wassuk [Member] | Assay & Labs [Member]        
Oil and Gas, Cost Incurred, Property Acquisition, Exploration, and Development [Line Items]        
Exploration expenditures 0 0 0 0
Singatse Peak Services [Member] | Wassuk [Member] | Drilling [Member]        
Oil and Gas, Cost Incurred, Property Acquisition, Exploration, and Development [Line Items]        
Exploration expenditures 0 0 0 0
Singatse Peak Services [Member] | Wassuk [Member] | Environmental [Member]        
Oil and Gas, Cost Incurred, Property Acquisition, Exploration, and Development [Line Items]        
Exploration expenditures 0 0 0 0
Singatse Peak Services [Member] | Wassuk [Member] | Geological [Member]        
Oil and Gas, Cost Incurred, Property Acquisition, Exploration, and Development [Line Items]        
Exploration expenditures 0   0  
Singatse Peak Services [Member] | Wassuk [Member] | Geophysical [Member]        
Oil and Gas, Cost Incurred, Property Acquisition, Exploration, and Development [Line Items]        
Exploration expenditures 0 0 0 0
Singatse Peak Services [Member] | Wassuk [Member] | Technical Study [Member]        
Oil and Gas, Cost Incurred, Property Acquisition, Exploration, and Development [Line Items]        
Exploration expenditures 0 0 0 0
Singatse Peak Services [Member] | Wassuk [Member] | Field Support [Member]        
Oil and Gas, Cost Incurred, Property Acquisition, Exploration, and Development [Line Items]        
Exploration expenditures 0 0 0 0
Singatse Peak Services [Member] | Wassuk [Member] | Nuton LLC [Member]        
Oil and Gas, Cost Incurred, Property Acquisition, Exploration, and Development [Line Items]        
Exploration expenditures 0 0 0 (1)
Singatse Peak Services [Member] | Wassuk [Member] | Lion CG [Member]        
Oil and Gas, Cost Incurred, Property Acquisition, Exploration, and Development [Line Items]        
Exploration expenditures 0 0 0 0
Falcon Copper Corp [Member]        
Oil and Gas, Cost Incurred, Property Acquisition, Exploration, and Development [Line Items]        
Exploration expenditures 1,398 24 1,474 99
Falcon Copper Corp [Member] | Blue Copper [Member]        
Oil and Gas, Cost Incurred, Property Acquisition, Exploration, and Development [Line Items]        
Exploration expenditures 0 23 0 66
Falcon Copper Corp [Member] | Blue Copper [Member] | Property Maintenance [Member]        
Oil and Gas, Cost Incurred, Property Acquisition, Exploration, and Development [Line Items]        
Exploration expenditures 0 7 0 38
Falcon Copper Corp [Member] | Blue Copper [Member] | Assay & Labs [Member]        
Oil and Gas, Cost Incurred, Property Acquisition, Exploration, and Development [Line Items]        
Exploration expenditures 0 0 0 0
Falcon Copper Corp [Member] | Blue Copper [Member] | Drilling [Member]        
Oil and Gas, Cost Incurred, Property Acquisition, Exploration, and Development [Line Items]        
Exploration expenditures 0 0 0 0
Falcon Copper Corp [Member] | Blue Copper [Member] | Environmental [Member]        
Oil and Gas, Cost Incurred, Property Acquisition, Exploration, and Development [Line Items]        
Exploration expenditures 0 0 0 0
Falcon Copper Corp [Member] | Blue Copper [Member] | Geological [Member]        
Oil and Gas, Cost Incurred, Property Acquisition, Exploration, and Development [Line Items]        
Exploration expenditures 0   0  
Falcon Copper Corp [Member] | Blue Copper [Member] | Geophysical [Member]        
Oil and Gas, Cost Incurred, Property Acquisition, Exploration, and Development [Line Items]        
Exploration expenditures 0 0 0 0
Falcon Copper Corp [Member] | Blue Copper [Member] | Technical Study [Member]        
Oil and Gas, Cost Incurred, Property Acquisition, Exploration, and Development [Line Items]        
Exploration expenditures 0 0 0 0
Falcon Copper Corp [Member] | Blue Copper [Member] | Field Support [Member]        
Oil and Gas, Cost Incurred, Property Acquisition, Exploration, and Development [Line Items]        
Exploration expenditures 0 16 0 28
Falcon Copper Corp [Member] | Blue Copper [Member] | Nuton LLC [Member]        
Oil and Gas, Cost Incurred, Property Acquisition, Exploration, and Development [Line Items]        
Exploration expenditures 0 0 0 0
Falcon Copper Corp [Member] | Blue Copper [Member] | Lion CG [Member]        
Oil and Gas, Cost Incurred, Property Acquisition, Exploration, and Development [Line Items]        
Exploration expenditures 0 23 0 66
Falcon Copper Corp [Member] | Schell Creek [Member]        
Oil and Gas, Cost Incurred, Property Acquisition, Exploration, and Development [Line Items]        
Exploration expenditures 0 1 0 11
Falcon Copper Corp [Member] | Schell Creek [Member] | Property Maintenance [Member]        
Oil and Gas, Cost Incurred, Property Acquisition, Exploration, and Development [Line Items]        
Exploration expenditures 0 0 0 0
Falcon Copper Corp [Member] | Schell Creek [Member] | Assay & Labs [Member]        
Oil and Gas, Cost Incurred, Property Acquisition, Exploration, and Development [Line Items]        
Exploration expenditures 0 0 0 0
Falcon Copper Corp [Member] | Schell Creek [Member] | Drilling [Member]        
Oil and Gas, Cost Incurred, Property Acquisition, Exploration, and Development [Line Items]        
Exploration expenditures 0 0 0 0
Falcon Copper Corp [Member] | Schell Creek [Member] | Environmental [Member]        
Oil and Gas, Cost Incurred, Property Acquisition, Exploration, and Development [Line Items]        
Exploration expenditures 0 0 0 0
Falcon Copper Corp [Member] | Schell Creek [Member] | Geological [Member]        
Oil and Gas, Cost Incurred, Property Acquisition, Exploration, and Development [Line Items]        
Exploration expenditures 0   0  
Falcon Copper Corp [Member] | Schell Creek [Member] | Geophysical [Member]        
Oil and Gas, Cost Incurred, Property Acquisition, Exploration, and Development [Line Items]        
Exploration expenditures 0 1 0 11
Falcon Copper Corp [Member] | Schell Creek [Member] | Technical Study [Member]        
Oil and Gas, Cost Incurred, Property Acquisition, Exploration, and Development [Line Items]        
Exploration expenditures 0 0 0 0
Falcon Copper Corp [Member] | Schell Creek [Member] | Field Support [Member]        
Oil and Gas, Cost Incurred, Property Acquisition, Exploration, and Development [Line Items]        
Exploration expenditures 0 0 0 0
Falcon Copper Corp [Member] | Schell Creek [Member] | Nuton LLC [Member]        
Oil and Gas, Cost Incurred, Property Acquisition, Exploration, and Development [Line Items]        
Exploration expenditures 0 0 0 0
Falcon Copper Corp [Member] | Schell Creek [Member] | Lion CG [Member]        
Oil and Gas, Cost Incurred, Property Acquisition, Exploration, and Development [Line Items]        
Exploration expenditures 0 1 0 11
Falcon Copper Corp [Member] | Other [Member]        
Oil and Gas, Cost Incurred, Property Acquisition, Exploration, and Development [Line Items]        
Exploration expenditures 0 0 0 22
Falcon Copper Corp [Member] | Other [Member] | Property Maintenance [Member]        
Oil and Gas, Cost Incurred, Property Acquisition, Exploration, and Development [Line Items]        
Exploration expenditures 0 0 0 22
Falcon Copper Corp [Member] | Other [Member] | Assay & Labs [Member]        
Oil and Gas, Cost Incurred, Property Acquisition, Exploration, and Development [Line Items]        
Exploration expenditures 0 0 0 0
Falcon Copper Corp [Member] | Other [Member] | Drilling [Member]        
Oil and Gas, Cost Incurred, Property Acquisition, Exploration, and Development [Line Items]        
Exploration expenditures 0 0 0 0
Falcon Copper Corp [Member] | Other [Member] | Environmental [Member]        
Oil and Gas, Cost Incurred, Property Acquisition, Exploration, and Development [Line Items]        
Exploration expenditures 0 0 0 0
Falcon Copper Corp [Member] | Other [Member] | Geological [Member]        
Oil and Gas, Cost Incurred, Property Acquisition, Exploration, and Development [Line Items]        
Exploration expenditures 0   0  
Falcon Copper Corp [Member] | Other [Member] | Geophysical [Member]        
Oil and Gas, Cost Incurred, Property Acquisition, Exploration, and Development [Line Items]        
Exploration expenditures 0 0 0 0
Falcon Copper Corp [Member] | Other [Member] | Technical Study [Member]        
Oil and Gas, Cost Incurred, Property Acquisition, Exploration, and Development [Line Items]        
Exploration expenditures 0 0 0 0
Falcon Copper Corp [Member] | Other [Member] | Field Support [Member]        
Oil and Gas, Cost Incurred, Property Acquisition, Exploration, and Development [Line Items]        
Exploration expenditures 0 0 0 0
Falcon Copper Corp [Member] | Other [Member] | Nuton LLC [Member]        
Oil and Gas, Cost Incurred, Property Acquisition, Exploration, and Development [Line Items]        
Exploration expenditures 0 0 0 0
Falcon Copper Corp [Member] | Other [Member] | Lion CG [Member]        
Oil and Gas, Cost Incurred, Property Acquisition, Exploration, and Development [Line Items]        
Exploration expenditures $ 0 $ 0 $ 0 $ 22