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Commitments and contingencies (Tables)
 9 Months Ended
Sep. 30, 2022
Commitments and Contingencies Explanatory [Abstract]  
Schedule of commitments and contingencies
   Payments due by years 
($000s)  Total   2022   2023-24   2025-26   2027-28 
Capital expenditure obligations   70,424    16,204    54,220    
-
    
-
 
Mineral interests   7,308    6    2,506    2,620    2,176 
Flow-through share expenditures   2,683    2,683    
-
    
-
    
-
 
Lease obligation   1,634    178    1,043    314    99 
    82,049    19,071    57,769    2,934    2,275