v3.25.2
Investments Accounted for Using the Equity Method - Additional Information (Detail)
12 Months Ended
Jan. 15, 2025
Jun. 30, 2025
Filo del Sol copper deposit [Member] | Filo Corp [Member]    
Disclosure of significant investments in associates and joint ventures [line items]    
Proportion of ownership interest in joint venture 100.00%  
Josemaria copper deposit [Member] | Lundin Mining [Member]    
Disclosure of significant investments in associates and joint ventures [line items]    
Proportion of ownership interest in joint venture 100.00%  
Vicuna Corp [Member]    
Disclosure of significant investments in associates and joint ventures [line items]    
Proportion of ownership interest in joint venture 50.00% 50.00%
Vicuna Corp [Member] | Filo Corp [Member]    
Disclosure of significant investments in associates and joint ventures [line items]    
Proportion of ownership interest in joint venture 50.00%  
BHP Canada Inc [Member] | Josemaria copper deposit [Member]    
Disclosure of significant investments in associates and joint ventures [line items]    
Proportion of ownership interest in joint venture 50.00%