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Cash and cash equivalents (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of Cash and cash equivalents [Line Items]        
Cash $ 347 $ 327    
Bank accounts [1] 57,078 51,953 [2]    
Time deposits [2] 311,775 162,271    
Cash and cash equivalents 369,200 214,551 $ 80,544 $ 78,519
Minera Yanacocha SRL and subsidiary [Member]        
Disclosure of Cash and cash equivalents [Line Items]        
Cash 33 34    
Bank accounts 111,319 48,995    
Time deposits 611,856 625,985    
Cash and cash equivalents 723,208 675,014    
Sociedad Minera Cerro Verde S.A.A. [Member]        
Disclosure of Cash and cash equivalents [Line Items]        
Bank accounts 3,679 3,500    
Cash equivalents (a) [3] 497,503 596,527    
Cash and cash equivalents $ 501,182 $ 600,027    
[1] Bank accounts earn interest at floating rates based on market rates.
[2] As of December 31, 2018 and 2017, time deposits were kept in prime financial institutions, which generated interest at annual market rates and had original maturities of less than 90 days, according to the immediate cash needs of the Group.
[3] Cash equivalents as of December 31, 2018, includes short-term deposits with Scotiabank Peru of US$125.0 million, BBVA Continental Peru of US$50.0 million, Citibank NY of US$42.9 million and Banco de Credito de Peru of US$5.9 million and a portfolio of investments in highly marketable liquid investments (investments classified as “AAA” by Standard & Poor’s and Moody’s) of US$273.7 million, which yield variable returns, and are classified as cash equivalents because they are readily convertible to known amounts of cash and management plans to use them for its short-term cash needs. Because of the short maturity of these investments (i.e., less than 90 days), the carrying amount of these investments corresponds to their fair value at the date of the financial statements. Changes in the fair value of these investments are insignificant.