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Basis for preparation, consolidation and accounting policies - Impact of Adoption of IFRS 16 on Impact on consolidated statement of cash flows (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of basis for preparation, consolidation and accounting policies [Line Items]      
Interest paid $ (21,653) $ (28,266) $ (27,699)
Net cash and cash equivalents provided by operating activities 122,885 47,065 346,260
Net cash and cash equivalents used in financing activities $ (35,258) (100,618) (74,052)
Minera Yanacocha SRL and subsidiary [Member]      
Disclosure of basis for preparation, consolidation and accounting policies [Line Items]      
Net cash and cash equivalents provided by operating activities   $ (34,419) $ (78,519)