Embedded derivatives (Tables)

12 Months Ended

Dec. 31, 2018

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

Disclosure Of Embedded derivatives [Line Items]

Disclosure of detailed information about embedded derivatives [text block]

As discussed in Note 2(d), the Company’s sales create exposure to changes in the market prices of copper and molybdenum which are considered embedded derivatives. As of December 31, 2018 and 2017, information about the Company’s embedded derivatives is as follows:

					As of December 31, 2018
	Pounds payable		Maturity		Provisional pricing	Forward pricing		Fair value provision
	(000)				US$/Pound	US$/Pound		US$(000)

Copper Concentrate		261,530		January 2019 to May 2019	Between 2.675 and 2.834		Between 2.704 and 2.708		(18,848	)
Copper Cathode		7,711		January 2019	2.810		2.704		(824	)
Molybdenum		3,545		January 2019 to February 2019	Between 10.787 and 10.810		10.675		(441	)

									(20,113	)(a)

As of December 31, 2017

Pounds

payable

Maturity

Provisional pricing

Forward pricing

Fair value provision

(000)

US$/Pound

US$(000)

Copper Concentrate

252,830

January 2018 to May 2018

Between

2.903

and

3.166

Between

3.274

and

3.297

62,870

Copper Cathode

2,756

January 2018

Between

2.970

and

3.246

3.274

179

Molybdenum

3,340

January 2018 to February 2018

Between

7.229

and

7.231

8.950

5,687

68,736

(a)

Embedded derivative adjustments are recorded on the statement of financial position in “Trade account receivable – related parties” (US$(19.3) million as of December 31, 2018 and US$65.6 million as of December 31, 2017) and “Trade accounts receivable (net)” (US$(0.8) million as of December 31, 2018 and US$3.1 million as of December 31, 2017).