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Significant accounting policies - Useful Lives of Intangible Assets (Details)
 12 Months Ended
Dec. 31, 2022
Minimum  
Significant accounting policies [Line Items]  
Description of useful life, intangible assets other than goodwill Unit-production method
Maximum  
Significant accounting policies [Line Items]  
Description of useful life, intangible assets other than goodwill Unit-production method
Water rights | Minimum  
Significant accounting policies [Line Items]  
Useful life measured as period of time, intangible assets other than goodwill 5 years
Water rights | Maximum  
Significant accounting policies [Line Items]  
Description of useful life, intangible assets other than goodwill Indefinite
Rights of way | Minimum  
Significant accounting policies [Line Items]  
Description of useful life, intangible assets other than goodwill Indefinite
Rights of way | Maximum  
Significant accounting policies [Line Items]  
Description of useful life, intangible assets other than goodwill Indefinite
Corfo Mining properties | Minimum  
Significant accounting policies [Line Items]  
Useful life measured as period of time, intangible assets other than goodwill 8 years
Corfo Mining properties | Maximum  
Significant accounting policies [Line Items]  
Useful life measured as period of time, intangible assets other than goodwill 8 years
Intellectual property | Minimum  
Significant accounting policies [Line Items]  
Useful life measured as period of time, intangible assets other than goodwill 9 years
Intellectual property | Maximum  
Significant accounting policies [Line Items]  
Useful life measured as period of time, intangible assets other than goodwill 9 years
IT programs | Minimum  
Significant accounting policies [Line Items]  
Useful life measured as period of time, intangible assets other than goodwill 3 years
IT programs | Maximum  
Significant accounting policies [Line Items]  
Useful life measured as period of time, intangible assets other than goodwill 9 years