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Commitments and contingencies (Details Textual) |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |  |  |  |  |
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Jan. 02, 2014 | Oct. 01, 2013 USD ($) | Oct. 01, 2013 PEN (S/) | Dec. 31, 2014 USD ($) | Sep. 30, 2011 USD ($) | Sep. 30, 2011 PEN (S/) | Jun. 23, 2004 | Dec. 31, 2017 USD ($) | Dec. 31, 2017 PEN (S/) | Dec. 31, 2011 USD ($) | Mar. 31, 2011 USD ($) | Mar. 31, 2011 PEN (S/) | Dec. 31, 2017 USD ($) | Dec. 31, 2017 PEN (S/) | Dec. 31, 2016 USD ($) | Dec. 31, 2016 PEN (S/) | Dec. 31, 2015 USD ($) | Dec. 31, 2015 PEN (S/) | Dec. 31, 2014 PEN (S/) | Sep. 30, 2011 USD ($) | Dec. 31, 2009 USD ($) | Dec. 31, 2009 PEN (S/) | Dec. 31, 2003 USD ($) | Dec. 31, 2002 | Dec. 31, 2000 USD ($) | Dec. 31, 2017 PEN (S/) | Dec. 31, 2015 PEN (S/) | Nov. 30, 2015 USD ($) | Jan. 08, 2015 USD ($) | Jan. 08, 2015 PEN (S/) | Dec. 17, 2014 PEN (S/) | Jun. 18, 2014 USD ($) | Jun. 18, 2014 PEN (S/) | Dec. 31, 2012 USD ($) | Dec. 31, 2012 PEN (S/) | Dec. 31, 2011 PEN (S/) | Dec. 02, 2009 USD ($) | Dec. 31, 2008 USD ($) | Dec. 31, 2008 PEN (S/) | Dec. 31, 2007 USD ($) | Dec. 31, 2007 PEN (S/) | Dec. 31, 2003 PEN (S/)
Disclosure of Commitments and contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description of material leasing arrangements by lessor classified as operating lease |  |  |  |  |  |  |  |  |  |  |  |  | The Group has entered into operating leases on its administrative offices in Lima located in Las Begonias Street N°415, San Isidro, Lima, Peru, with a lease term of 10 years since the year 2013. The Group has the option to lease the assets for two additional term of 5 years each. | The Group has entered into operating leases on its administrative offices in Lima located in Las Begonias Street N°415, San Isidro, Lima, Peru, with a lease term of 10 years since the year 2013. The Group has the option to lease the assets for two additional term of 5 years each. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated financial effect of contingent liabilities |  |  |  |  |  |  |  | $ 1,100,000 |  |  |  |  | $ 1,100,000 |  | $ 9,900,000 |  |  |  |  |  |  |  |  |  |  |  | S/ 607,721,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other provisions |  |  |  |  |  |  |  | 3,695,000 |  |  |  |  | 3,695,000 |  | 1,703,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deductible temporary differences for which no deferred tax asset is recognised |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 23,428,000 |  |  |  |  |  |  |  |  |  | S/ 76,023,000 |  |  |  |  |  |  |  |  |  |  | $ 471,798,000 | S/ 1,530,985,000 | $ 325,516,000 | S/ 1,056,310,000 |
Tax expense (income), continuing operations |  |  |  |  |  |  |  |  |  |  |  |  | 18,012,000 |  | 53,504,000 |  | 14,763,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax Assessments Liability | S/ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | S/ 106,400,000 |  |  |  |  |  |  |  |  |  |  |  | S/ 106,400,000 |  |  |  |  |  |  |  |  |  |  |
Penalties and interest unrecognised |  |  |  | $ 139,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | S/ 139,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax payment, Estimate of Possible Loss |  | $ 151,500,000 | S/ 492,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Penalties and interest paid to government |  | $ 89,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax payment based on estimated due |  |  |  |  |  |  |  |  |  |  |  |  | 145,900,000 | S/ 459,700,000 |  | S/ 459,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax payment based on exchange rates |  |  |  |  |  |  |  |  |  |  |  |  | $ 141,700,000 |  | 141,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Penalties and interest for default tax |  |  |  |  |  |  |  |  |  | $ 7,800,000 |  |  |  |  |  |  |  |  |  | $ 99,900,000 | $ 56,200,000 | S/ 289,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Withholding tax, New Tax Rate |  |  |  |  |  |  |  |  |  |  |  |  | 30.00% | 30.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Withholding tax, Old Tax Rate |  |  |  |  |  |  |  |  |  |  |  |  | 12.00% | 12.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent withholding tax, amount |  |  |  |  |  |  |  | 3,940,000 | S/ 12,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingencies, laws affected |  |  |  |  |  |  |  |  |  |  |  |  | The alleged OEFA violations currently range from zero to 11,310 tax units and the water authority alleged violations range from zero to 10,054 tax units, being each tax unit equivalent to approximately US$1,224 based on current exchange rates. | The alleged OEFA violations currently range from zero to 11,310 tax units and the water authority alleged violations range from zero to 10,054 tax units, being each tax unit equivalent to approximately US$1,224 based on current exchange rates. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Withholding tax rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12.00% | 30.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income tax contingencies,amount |  |  |  |  |  |  |  |  |  | $ 3,500,000 |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,900,000 |  |  |  |  |  |  |  |  |  |  | $ 3,500,000 | S/ 11,500,000 | S/ 11,500,000 |  |  |  |  |  | S/ 12,800,000
Payment to acquire contractual positions in mining concession agreements |  |  |  |  |  |  |  |  |  |  |  |  | $ 29,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax penalty |  |  |  |  |  |  |  | 82,900,000 |  |  |  |  | 82,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Royalty expense |  |  |  |  |  |  |  |  |  |  |  |  | (31,217,000) |  | (27,611,000) |  | 27,188,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minera Yanacocha SRL and subsidiary [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Commitments and contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other provisions |  |  |  |  |  |  |  | 3,243,000 |  |  |  |  | 3,243,000 |  | 23,809,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax expense (income), continuing operations |  |  |  |  |  |  |  |  |  |  |  |  | $ 7,026,000 |  | 43,127,000 |  | 602,717,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingencies, laws affected |  |  |  |  |  |  |  |  |  |  |  |  | The alleged OEFA violations currently range from zero to 11,310 tax units and the water authority alleged violations range from zero to 10,054 tax units, being each tax unit equivalent to approximately US$1,224 based on current exchange rates. | The alleged OEFA violations currently range from zero to 11,310 tax units and the water authority alleged violations range from zero to 10,054 tax units, being each tax unit equivalent to approximately US$1,224 based on current exchange rates. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minera Yanacocha SRL and subsidiary [member] | SMRL Coshuro [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Commitments and contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Royalty rate on net sales |  |  |  |  |  |  |  |  |  |  |  |  | 3.00% | 3.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minera Yanacocha SRL and subsidiary [member] | Los Tapados S.A [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Commitments and contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Royalty rate on net sales |  |  |  |  |  |  |  |  |  |  |  |  | 3.00% | 3.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Yanacocha [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Commitments and contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment to assume their respective contractual positions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 29,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Provisional liability |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 82,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax contingent liability [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Commitments and contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated financial effect of contingent liabilities |  |  |  |  |  |  |  | 3,500,000 |  |  |  |  | $ 3,500,000 |  |  |  |  |  |  |  |  |  |  |  |  | S/ 11,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other environment related provision [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Commitments and contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other provisions |  |  |  |  |  |  |  | 1,224 |  |  |  |  | 1,224 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Empresa de Generacion Huanza S.A. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Commitments and contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finance lease liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 119,000,000 |  |  |  |  |
Estimated financial effect of contingent liabilities |  |  |  |  |  |  |  | 1,784,000,000,000 |  |  |  |  | 1,784,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |  | 5,790,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized Depreciation expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,484,000 | S/ 27,532,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Buenaventura Ingenieros S.A. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Commitments and contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bonus to staff and income from transfer of fuel to suppliers net |  |  |  |  |  |  |  |  |  |  |  |  | 6,451,000 | S/ 20,934,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Value of claims resolved |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,886,000 | 12,611,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Buenaventura Ingenieros S.A. [Member] | Income tax contingent liability [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Commitments and contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated financial effect of contingent liabilities |  |  |  |  |  |  |  | 1,927,000,000,000 |  |  |  |  | 1,927,000,000,000 |  |  |  | 187,279,000,000,000 |  |  |  |  |  |  |  |  | 6,252,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Buenaventura Ingenieros S.A. [Member] | VAT contingent liability [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Commitments and contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated financial effect of contingent liabilities |  |  |  |  |  |  |  | 1,256,000,000,000 |  |  |  |  | 1,256,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |  | 4,077,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other subsidiaries [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Commitments and contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax expense (income), continuing operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,312,000 | S/ 10,747,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
El Brocal S.A.A. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Commitments and contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current tax liabilities, non-current |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,568,000 | S/ 8,333,000 |  |  |  |  |  |  |  |  |
San Jose Reservoir Trust [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Commitments and contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding commitments made by entity, related party transactions |  |  |  |  |  |  |  | 6,321,000 |  |  |  |  | 6,321,000 |  | 7,626,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rest of the subsidiaries [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Commitments and contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated financial effect of contingent liabilities |  |  |  |  |  |  |  | 2,786,000,000,000 |  |  |  |  | $ 2,786,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |  | 9,042,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sindicato Minero de Orcopampa [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Commitments and contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lease concession expense, Percent |  |  |  |  |  |  |  |  |  |  |  |  | 10.00% | 10.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
S.M.R.L. Chaupiloma Dos de Cajamarca [Member] | Minera Yanacocha SRL and subsidiary [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Commitments and contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Royalty rate on net sales |  |  |  |  |  |  |  |  |  |  |  |  | 3.00% | 3.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Royalty expense |  |  |  |  |  |  |  |  |  |  |  |  | $ (20,739,000) |  | (24,339,000) |  | $ (32,414,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Buenaventura [Member] | Minera Yanacocha SRL and subsidiary [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Commitments and contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Royalty rate on net sales |  |  |  |  |  |  |  |  |  |  |  |  | 3.00% | 3.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sociedad Minera El Brocal S.A.A. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Commitments and contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax assessment value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,241,000 | S/ 4,030,000 |  |  |  |  |  |  |  |  |  |  |  |
Sociedad Minera El Brocal S.A.A. [Member] | Tax contingent liability [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Commitments and contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated financial effect of contingent liabilities |  |  |  |  |  |  |  | 2,330,000,000,000 |  |  |  |  | $ 2,330,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |  | 7,562,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minera La Zanja S.R.L. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Commitments and contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated financial effect of contingent liabilities |  |  |  |  |  |  |  | $ 2,880,000,000,000 |  |  |  |  | 2,880,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |  | S/ 9,344,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13,032,000 | 42,289,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized development cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 12,251,000 | S/ 39,755,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cerro Verde [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Commitments and contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Penalties and interest for default tax |  |  |  |  | $ 99,900,000 |  |  |  |  |  | $ 7,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Royalty expense |  |  |  |  |  |  |  |  |  |  |  |  | 393,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
value of exemption claimed |  |  |  |  |  |  |  |  |  |  |  |  | $ 385,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annotations including penalties and interest for default tax |  |  |  |  | $ 180,700,000 | S/ 586,500,000 |  |  |  |  | $ 15,300,000 | S/ 49,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cerro Verde [Member] | Bottom of range [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Commitments and contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Royalty rate on net sales |  |  |  |  |  |  | 1.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cerro Verde [Member] | Top of range [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Commitments and contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Royalty rate on net sales |  |  |  |  |  |  | 3.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cerro Verde [Member] | New guarantee contract [Member] | Bottom of range [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Commitments and contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Royalty rate on net sales | 1.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cerro Verde [Member] | New guarantee contract [Member] | Top of range [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Commitments and contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Royalty rate on net sales | 12.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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