Basis for preparation, consolidation and accounting policies (Tables)

12 Months Ended

Dec. 31, 2018

Disclosure of basis for preparation, consolidation and accounting policies [Line Items]

Disclosure of Measurement Requirement of IFRS9 Explanatory [Table Text Block]

The classification and measurement requirements of IFRS 9 did not have a significant impact to the Group. Upon the adoption of IFRS 9, the Group had the following required or elected reclassifications as of January 1, 2018.

			IFRS 9 measurement category
			Fair value through profit or loss		Amortized cost		Fair value through other profit or loss
	US$(000)		US$(000)		US$(000)		US$(000)

IAS 39 measurement category
Financial Assets -
Loans and receivables -
Trade receivables (without provisional prices)		61,188		-		61,188		-
Trade receivables (with provisional prices)		144,844		152,268		-		-
Other accounts receivables		51,808		-		51,808		-

Financial assets at fair value through profit and loss -
Embedded derivatives		7,424		-		-		-

Financial Liabilities -
Loans and borrowings -
Bank loans		96,215		-		96,215		-
Financial obligations		633,083		-		633,083		-
Trade and other payables		220,042		-		220,042		-

Financial liability at fair value through profit and loss -
Contingent consideration liability		17,570		17,570		-		-

Fair value with changes in profit (loss) -
Hedge derivative financial instruments		28,705		-		-		28,705

The disclosure of useful lives of assets. [Text Block]

Depreciation of assets in mining units with short useful lives or used for administrative purposes is calculated using the straight-line method of accounting. The useful lives are the following:

	Years

Buildings, construction and other	Between 6 and 20
Machinery and equipment	Between 5 and 10
Transportation units	5
Furniture and fixtures	10
Computer equipment	4

Minera Yanacocha SRL and subsidiary [Member]

Disclosure of basis for preparation, consolidation and accounting policies [Line Items]

Disclosure of Measurement Requirement of IFRS9 Explanatory [Table Text Block]

The classification and measurement requirements of IFRS 9 did not have a significant impact to the Company. Upon the adoption of IFRS 9, the Company had the following required or elected balances as of January 1, 2018.

January 1, 2018 -

			IFRS 9 measurement category
			Fair value through profit or loss/OCI		Amortized cost
	US$(000)		US$(000)		US$(000)

IAS 39 measurement category
Financial Assets -
Financial assets -
Embedded derivatives		15		15		-
Financial assets at fair value		23,000		23,000		-

Receivables -
Trade receivables		1,032		-		1,032
Other receivables		25,557		-		25,557

Financial Liabilities -
Loans and borrowings -
Trade and other payables		81,215		-		81,215

January 1, 2017 -

			IFRS 9 measurement category
			Fair value through profit or loss/OCI		Amortized cost
	US$(000)		US$(000)		US$(000)

IAS 39 measurement category
Financial Assets -
Financial assets -
Embedded derivatives		346		346		-
Financial assets at fair value		16,454		16,454		-

Receivables -
Trade receivables		9,965		-		9,965
Other receivables		24,055		-		24,055

Financial Liabilities -
Loans and borrowings -
Trade and other payables		63,300		-		63,300

The disclosure of useful lives of assets. [Text Block]

Remaining useful lives as follows:

Land improvements	Between 2 and 4 years
Buildings	Between 5 and 10 years
Plant and equipment	Between 3 and 10 years
Vehicles	Between 3 and 4 years
Furniture and fittings	Between 3 and 4 years
Other equipment	Between 3 and 4 years
Computer equipment	Between 3 and 4 years
Assets retirement cost	Useful life of the mine and (or) process facilities