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Tax situation (Tables)

12 Months Ended

Dec. 31, 2017

Disclosure Of Income Tax Explanatory [Line Items]

Disclosure Of Detailed Information Income Tax Years To Review [Text Block]

The Income Tax and Value Added Tax returns for the following years are open to review by the Tax Authorities:

Entity	Years open to review by the Tax Authorities

Compañía de Minas Buenaventura S.A.A.	2013-2017
Bisa Construcción S.A. (absorbed by Buenaventura Ingenieros S.A. in 2015)	2014-2015
Buenaventura Ingenieros S.A.	2013, 2015-2017
Compañía de Exploraciones, Desarrollo e Inversiones Mineras S.A.C. – CEDIMIN (absorbed by the Company in 2013)	2013
Compañía Minera Condesa S.A.	2013-2017
Compañía Minera Colquirrumi S.A.	2013-2017
Consorcio Energético de Huancavelica S.A.	2013-2017
Contacto Corredores de Seguros S.A.	2014-2017
El Molle Verde S.A.C.	2013-2017
Empresa de Generación Huanza S.A.	2013, 2015, 2016, 2017
Inversiones Colquijirca S.A.	2013-2017
Minera La Zanja S.R.L.	2014-2017
Sociedad Minera El Brocal S.A.A.	2014-2017
S.M.R.L. Chaupiloma Dos de Cajamarca	2014-2017
Procesadora Industrial Río Seco S. A.	2014-2017
Apu Coropuna S.R.L.	2013-2017
Cerro Hablador S. A. C.	2013-2017
Minera Azola S. R. L.	2014-2017

Minera Yanacocha SRL and subsidiary [Member]

Disclosure Of Income Tax Explanatory [Line Items]

Disclosure Of Detailed Information Income Tax Years To Review [Text Block]

The Company has entered into the following tax stability agreements, each with a term of 15 years:

Mine	Effective	Date of the Tax Agreement	Tax Regimes in Force

Cerro Yanacocha	January 1, 2000	September 16, 1998	May 22, 1997
La Quinua	January 1, 2004	August 25, 2003	August 25, 2003

Disclosure Of Detailed Information About Income Tax Provision [Text Block]

The Company's income tax provision consisted of the following:

	2017		2016		2015
	US$(000)		US$(000)		US$(000)

Current Peruvian income tax		3,877		41,105		98,319
Royalties and mining taxes		4,944		10,249		21,721
Other taxes		211		323		639
Income tax prior year adjustments		(2,006)		(2,092)		(1,766)
Income tax prior years refunds		-		(6,458)		-
Current income tax expense		7,026		43,127		118,913
Deferred income tax expense (benefit)		-		-		483,804
Income tax expense		7,026		43,127		602,717

Disclosure of detailed deferred taxes [Text Block]

Components of deferred income tax assets (liabilities) are as follows:

	2017		2016
	US$(000)		US$(000)

Deferred income tax assets, net
Property, plant and mine development		571,210		608,783
Reclamation		233,843		160,261
Accounts payable and accrued expenses		78,241		64,703
Inventories		61,435		60,018
Other		3,073		3,077
		947,802		896,842
Allowance of deferred income tax asset		(947,802)		(896,842)
Net deferred income tax asset		-		-

Disclosure Of Tax Expense Reconciliation Of Accounting Profit Multiplied By Applicable Tax Rates [Text Block]

Below is a reconciliation of tax expense and the accounts profit multiplied by the statutory tax rate for the years 2017 and 2016:

	2017			2016			2015
	US$(000)			US$(000)			US$(000)

Income (loss) before income tax		(168,428)			(1,000,625)			152,522
Peruvian statutory tax rate		29.5	%		28	%		28	%
Income tax expense (income)		(49,686)			(280,175)			42,706
Valuation allowance on deferred tax asset		50,960			386,763			510,004
Effect of change in income tax rate		-			(66,667)			16,576
Mining taxes		3,530			7,392			15,639
Non-deductible expenses		4,204			3,296			15,288
Adjustment due to income tax rate applicable to la Quinua		(124)			(1,024)			2,504
Income tax prior years refunds / payments		(1,858)			(6,458)			-
Total income tax expense		7,026			43,127			602,717

Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits Explanatory [Text Block]

The Company recognizes the effect of temporary differences between the accounting base for financial reporting purposes and the tax base. The composition of this item is made up as follows:

	December 31,		December 31,		December 31,
	2017		2016		2015
	US$(000)		US$(000)		US$(000)

Income tax
Asset
Royalty accrual		127,475		-		-
Provision for remediation and mine closure		12,083		9,180		5,638
Provision for mining taxes		8,742		4,003		1,505
Unpaid vacations		5,293		4,055		2,515
SUNAT Assessments		4,077		-		-
Cost of net asset for the construction of the tailing dam		2,007		2,321		1,682
Development costs		183		228		332
Price adjustment of copper concentrates and cathode		-		-		7,849
Other provisions		4,240		5,248		4,750

		164,100		25,035		24,271


Liability
Difference in depreciation method		261,434		283,882		245,670
Price adjustment of copper concentrate and cathode		25,840		24,128		-

	December 31,		December 31,		December 31,
	2017		2016		2015
	US$(000)		US$(000)		US$(000)

Stripping activity asset		22,014		23,594		17,820
Difference in valuation of inventories		16,264		25,087		10,997
Debt issuance costs		2,663		-		-

		328,215		356,691		274,487
Deferred liabilities, net		164,115		331,656		250,216

Supplementary retirement fund
Deferred liability		1,890		3,458		2,937


Total deferred income tax liability, net		166,005		335,114		253,153

Sociedad Minera El Brocal S.A.A. [Member]

Disclosure Of Income Tax Explanatory [Line Items]

Disclosure Of Detailed Information About Income Tax Provision [Text Block]

The income tax expenses (benefit) for the years ended December 31, 2017, 2016 and 2015 is shown below:

	2017		2016		2015
	US$(000)		US$(000)		US$(000)

Income tax
Current		430,974		141,153		(832)
Deferred		(167,541)		81,441		32,015

		263,433		222,594		31,183

Mining taxes
Current mining royalty and special mining tax		213,280		37,763		14,599

Supplementary retirement fund
Current		10,897		2,205		54
Deferred		(1,567)		520		410

		9,330		2,725		464

Income tax expense reported in the statements of comprehensive income		486,043		263,082		46,246

Disclosure of detailed information about the other tax assesment [Text Block]

The Company has also received assessments from SUNAT for additional taxes (other than the mining royalty explained in 14(d) above), including penalties and interest. The Company has filed or will file objections to the assessments because it believes it has properly determined and paid its taxes. A summary of these assessments follows:

			Penalty and
Year	Taxes		interest		Total
	US$(000)		US$(000)		US$(000)

2003 – 2005		15,909		54,053		69,962
2006		6,545		59,454		65,999
2007		12,376		17,809		30,185
2008		20,797		12,968		33,765
2009		58,495		49,112		107,607
2010		65,997		107,139		173,136
2011		49,055		63,931		112,986
2014 –2017		23,450		-		23,450
		252,624		364,466		617,090

Disclosure of detailed information reconciliation of income tax rate [Text Block]

For the years ended December 31, 2017, 2016 and 2015, the income tax expense recorded differs from the result of applying the legal rate to the Company’s profit before income tax, as detailed below:

	2017			2016			2015
	US$(000)			US$(000)			US$(000)

Profit before income tax		835,924			603,989			79,530
Income tax rate		32	%		32	%		32	%

Expected income tax expense		267,496			193,276			25,450
Non - deductible expenses		25,217			27,788			19,534
Royalty case		(12,029)			-			-
Special mining tax and mining royalties		(21,704)			(12,084)			(4,672)
Income tax rate change effect on deferred taxes for change in Peruvian tax law once the current Stability Contract expires (from 32% to 31.35%)		(1,632)			13,850			-
Income tax true – ups		10,210			1,677			(6,082)
Others		(4,125)			(1,913)			(3,047)

Current and deferred income tax charges to results		263,433			222,594			31,183
Mining taxes charged to results		213,280			37,763			14,599
Supplementary retirement fund charged to results		9,330			2,725			464

		486,043			263,082			46,246

Effective income tax		58.14	%		43.56	%		58.15	%