v3.25.2
Investments Accounted for Using the Equity Method - Summary of Ownership Interest in Equity Accounted Investments (Detail)
12 Months Ended
Jan. 15, 2025
Jun. 30, 2025
Jun. 30, 2024
Disclosure of significant investments in associates and joint ventures [line items]      
Reporting date   --06-30  
Samarco Mineracao S.A. [member]      
Disclosure of significant investments in associates and joint ventures [line items]      
Country of incorporation   Brazil  
Principal place of business   Brazil  
Principal activity   Iron ore mining  
Reporting date   --12-31  
Ownership interest   50.00% 50.00%
Vicuna Corp [Member]      
Disclosure of significant investments in associates and joint ventures [line items]      
Country of incorporation   Canada / Argentina /Chile  
Principal place of business   Canada / Argentina /Chile  
Principal activity   Copper development  
Reporting date   --12-31  
Ownership interest 50.00% 50.00%  
Compania Minera Antamina S.A. [member]      
Disclosure of significant investments in associates and joint ventures [line items]      
Country of incorporation   Peru  
Principal place of business   Peru  
Principal activity   Copper and zinc mining  
Reporting date   --12-31  
Ownership interest   33.75% 33.75%