Shareholders' equity, net (Tables)

12 Months Ended

Dec. 31, 2017

Disclosure of Shareholders’ equity, net [Line Items]

Disclosure of detailed information about dividends declared and paid [Text Block]

During 2015, no dividends have been declared or paid. The table below presents the dividends declared and paid in 2017 and 2016:

Meetings	Date	Dividends paid		Dividend per share
		US$(000)		US$

2017 Dividends
Mandatory Annual Shareholders’ Meeting	March 28		15,711		0.056
Less - Dividends of treasury shares			(1,232)

			14,479

Board of Directors’ Meeting	October 27		8,269		0.030
Less - Dividends of treasury shares			(649)

			7,620
			22,099
2016 Dividends
Board of Directors’ Meeting	October 27		8,269		0.030
Less - Dividends of treasury shares			(648)

			7,621

Disclosure Of Earning Per Share [Text Block]

The calculation of profit (loss) per share attributable to the equity holders of the parent is presented below:

	2017		2016		2015

Profit (loss) net (numerator) - US$		60,823,000		(323,492,000)		(317,210,000)
Total common and investment shares (denominator)		253,986,867		253,986,867		254,186,867

Profit (loss) net per basic share and diluted - US$		0.24		(1.27)		(1.25)

The calculation of profit (loss) per share from continuing operations attributable to the equity holders of the Parent is presented below:

	2017		2016		2015

Profit (loss) net (numerator) - US$		70,921,000		(304,419,000)		(296,977,000)
Total common and investment shares (denominator)		253,986,867		253,986,867		254,186,867

Profit (loss) net per basic share and diluted - US$		0.28		(1.20)		(1.17)

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

Disclosure of Shareholders’ equity, net [Line Items]

Disclosure of detailed information about equity share capital [Text Block]

As of December 31, 2017, the Company’s capital stock structure is as follows:

Percentage of individual interest in capital	Number of shareholders		Total percentage interest

Up to 1.00		2,835		4.37
From 1.01 to 20.00		2		21.07
From 20.01 to 30.00		1		21.00
From 30.01 to 60.00		1		53.56

		2,839		100.00

capital stock [Member]

Disclosure of Shareholders’ equity, net [Line Items]

Disclosure of classes of share capital [text block]

The Group’s share capital is stated in Soles and consists of common shares with voting rights, with a nominal amount of S/10.00 per share. The table below presents the composition of the capital stock as of December 31, 2017 and 2016:

	Number of shares		Capital stock		Capital stock
			S/(000)		US$(000)

Common shares		274,889,924		2,748,899		813,162
Treasury shares		(21,174,734)		(211,747)		(62,665)

		253,715,190		2,537,152		750,497

investment shares [Member]

Disclosure of Shareholders’ equity, net [Line Items]

Disclosure of classes of share capital [text block]

The table below presents the composition of the investment shares as of December 31, 2017 and 2016:

	Number of shares		Number of shares		Number of shares
			S/(000)		US$(000)

Investment shares		744,640		7,447		2,161
Treasury investment shares		(472,963)		(4,730)		(1,370)

		271,677		2,717		791