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Basis for preparation, consolidation and accounting policies (Details)
 12 Months Ended
Dec. 31, 2017
Buildings [member]  
Disclosure of basis for preparation, consolidation and accounting policies [Line Items]  
Useful lives or depreciation rates, property, plant and equipment Between 6 and 20
Buildings [member] | Minera Yanacocha SRL and subsidiary [Member]  
Disclosure of basis for preparation, consolidation and accounting policies [Line Items]  
Useful lives or depreciation rates, property, plant and equipment Between 5 and 10 years
Buildings [member] | Sociedad Minera Cerro Verde S.A.A. [Member]  
Disclosure of basis for preparation, consolidation and accounting policies [Line Items]  
Useful lives or depreciation rates, property, plant and equipment Between 5 and 35
Machinery [member]  
Disclosure of basis for preparation, consolidation and accounting policies [Line Items]  
Useful lives or depreciation rates, property, plant and equipment Between 5 and 10
Machinery [member] | Sociedad Minera Cerro Verde S.A.A. [Member]  
Disclosure of basis for preparation, consolidation and accounting policies [Line Items]  
Useful lives or depreciation rates, property, plant and equipment Between 3 and 25
Vehicles [member]  
Disclosure of basis for preparation, consolidation and accounting policies [Line Items]  
Useful lives or depreciation rates, property, plant and equipment 5
Vehicles [member] | Minera Yanacocha SRL and subsidiary [Member]  
Disclosure of basis for preparation, consolidation and accounting policies [Line Items]  
Useful lives or depreciation rates, property, plant and equipment Between 3 and 4 years
Vehicles [member] | Sociedad Minera Cerro Verde S.A.A. [Member]  
Disclosure of basis for preparation, consolidation and accounting policies [Line Items]  
Useful lives or depreciation rates, property, plant and equipment 7
Fixtures and fittings [member]  
Disclosure of basis for preparation, consolidation and accounting policies [Line Items]  
Useful lives or depreciation rates, property, plant and equipment 10
Fixtures and fittings [member] | Minera Yanacocha SRL and subsidiary [Member]  
Disclosure of basis for preparation, consolidation and accounting policies [Line Items]  
Useful lives or depreciation rates, property, plant and equipment Between 3 and 4 years
Fixtures and fittings [member] | Sociedad Minera Cerro Verde S.A.A. [Member]  
Disclosure of basis for preparation, consolidation and accounting policies [Line Items]  
Useful lives or depreciation rates, property, plant and equipment 7
Computer equipment [member]  
Disclosure of basis for preparation, consolidation and accounting policies [Line Items]  
Useful lives or depreciation rates, property, plant and equipment 4
Computer equipment [member] | Minera Yanacocha SRL and subsidiary [Member]  
Disclosure of basis for preparation, consolidation and accounting policies [Line Items]  
Useful lives or depreciation rates, property, plant and equipment Between 3 and 4 years
Land improvements [member] | Minera Yanacocha SRL and subsidiary [Member]  
Disclosure of basis for preparation, consolidation and accounting policies [Line Items]  
Useful lives or depreciation rates, property, plant and equipment Between 2 and 4 years
Plant and equipment [Member] | Minera Yanacocha SRL and subsidiary [Member]  
Disclosure of basis for preparation, consolidation and accounting policies [Line Items]  
Useful lives or depreciation rates, property, plant and equipment Between 3 and 10 years
Other property, plant and equipment [member] | Minera Yanacocha SRL and subsidiary [Member]  
Disclosure of basis for preparation, consolidation and accounting policies [Line Items]  
Useful lives or depreciation rates, property, plant and equipment Between 3 and 4 years
Other property, plant and equipment [member] | Sociedad Minera Cerro Verde S.A.A. [Member]  
Disclosure of basis for preparation, consolidation and accounting policies [Line Items]  
Useful lives or depreciation rates, property, plant and equipment Between 3 and 25
Asset retirement cost [Member] | Minera Yanacocha SRL and subsidiary [Member]  
Disclosure of basis for preparation, consolidation and accounting policies [Line Items]  
Useful lives or depreciation rates, property, plant and equipment Useful life of the mine and/or process facilities