Financial - risk management objectives and policies (Tables)

12 Months Ended

Dec. 31, 2017

Disclosure of financial risk management objectives and policies [Line Items]

Disclosure of foreign-currency exchange rates risk [Text Block]

A table showing the effect on results of a reasonable change in foreign-currency exchange rates is presented below, with all other variables kept constant:

	Exchange-rate			Effect on profit (loss)
	increase/decrease			before income tax
				US$(000)
2017
Exchange rate		+10	%		2,474
Exchange rate		-10	%		(2,459)

2016
Exchange rate		+10	%		(924)
Exchange rate		-10	%		926

2015
Exchange rate		+10	%		6,233
Exchange rate		-10	%		(7,618)

Disclosure of interest rates risk [Text Block]

A table showing the effect in profit or loss of the variations of interest rates:

	Increase/decrease
	of Libor rate		Effect on results
	(percentage rates)		US$(000)
2017
Interest rate		+10		(677)
Interest rate		-10		677

2016
Interest rate		+10		333
Interest rate		-10		(333)

2015
Interest rate		+10		294
Interest rate		-10		(294)

Disclosure of financial liabilities by remaining maturity [Text Block]

An analysis of the Group’s financial liabilities classified according to their aging is presented below, based on undiscounted contractual payments:

	Less than		Between 1		Between 2		More than 5
	1 year		and 2 years		and 5 years		years		Total
	US$(000)		US$(000)		US$(000)		US$(000)		US$(000)

As of December 31,2017 -
Bank loans		96,580		-		-		-		96,580
Trade and other payables		219,379		663		-		-		220,042
Derivative financial instruments		28,705		-		-		-		28,705
Financial obligation		110,062		148,718		449,689		-		708,469
Contingent consideration liability		-		-		9,280		28,469		37,749

Total		454,726		149,381		458,969		28,469		1,091,545

As of December 31,2016 -
Bank loans		55,000		-		-		-		55,000
Trade and other payables		253,062		-		-		15,982		269,044
Derivative financial instruments		3,863		-		-		-		3,863
Embedded derivative for sale of concentrates		1,524		-		-		-		1,524
Financial obligation		70,420		113,070		503,029		-		686,519
Contingent consideration liability		-		3,305		6,603		32,840		42,748

Total		383,869		116,375		509,632		48,822		1,058,698

Minera Yanacocha SRL and subsidiary [Member]

Disclosure of financial risk management objectives and policies [Line Items]

Disclosure of detailed information about current financial liabilities [text block]

The following table represents the analysis of the Company's financial liabilities, considering the remaining period to reach such maturity as of the consolidated statement of financial position date (see note 11):

	2017		2016
	Less than 1 year		Less than 1 year
	US$(000)		US$(000)

Trade accounts payable		43,108		44,634
Accounts payable to related parties		9,962		9,052
Remuneration and similar benefits payable		27,419		8,516
		80,489		62,202