Financial risk management (Tables)

12 Months Ended

Dec. 31, 2017

Disclosure Of Financial risk management [Line Items]

Disclosure of maturity analysis for non-derivative financial liabilities [text block]

(f)

The long-term portion of the financial obligations held by the Group matures as follows:

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

Between 1 and 2 years		125,215		81,057
Between 2 and 5 years		427,680		474,294
		552,895		555,351
Debt issuance costs		(3,803)		(3,119)
		549,092		552,232

Sociedad Minera Cerro Verde S.A.A. [Member]

Disclosure Of Financial risk management [Line Items]

Disclosure of detailed information about foreign currency exchange rates risk [Text Block]

The table below summarizes the estimated impact on the Company’s profit before income tax for the year 2017 based on a 10% increase or decrease in future copper price while all other variables are held constant. The 10% increase is based on copper prices ranging from US$/pound 3.602 to US$/pound 3.627, and the 10% decrease is based on copper prices ranging from US$/pound 2.947 to US$/pound 2.967.

	Effect on profit before
	income tax
	US$(000)

December 31, 2017
10% increase in future copper prices		83,955
10% decrease in future copper prices		(83,955)

Disclosure of maturity analysis for non-derivative financial liabilities [text block]

The following tables show the expected aging of maturity of the Company’s obligations, excluding taxes and accruals, as of December 31, 2017 and 2016:

	On demand		Less than 3 months		3 to 12 months		1 to 5 years		Total
	US$(000)		US$(000)		US$(000)		US$(000)		US$(000)
As of December 31, 2017
Trade accounts payable		-		194,890		68		-		194,958
Accounts payable - related parties		-		5,534		-		8,147		13,681
Other financial liabilities		-		-		-		1,268,488		1,268,488
Provision related to benefits to employees		-		64,339		16,406		29,158		109,903
Other accounts payable		-		3,374		36,808		-		40,182

Total		-		268,137		53,282		1,305,793		1,627,212

As of December 31, 2016
Trade accounts payable		-		168,244		113		-		168,357
Accounts payable - related parties		-		27,134		-		7,132		34,266
Other financial liabilities		-		-		161		1,995,843		1,996,004
Provision related to benefits to employees		-		3,807		44,232		-		48,039
Other accounts payable		-		2,402		1,217		-		3,619

Total		-		201,587		45,723		2,002,975		2,250,285