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Cash and cash equivalents (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Cash and cash equivalents        
Cash $ 304 $ 347    
Bank accounts [1] 37,836 57,078    
Time deposits [2] 171,906 311,775    
Cash and cash equivalents. 210,046 369,200 $ 214,551 $ 80,544
Minera Yanacocha SRL and subsidiary [Member]        
Cash and cash equivalents        
Cash 22 33    
Bank accounts 56,822 111,319    
Time deposits 761,659 611,856    
Cash and cash equivalents. 818,503 723,208    
Sociedad Minera Cerro Verde S.A.A. [Member]        
Cash and cash equivalents        
Bank accounts 10,119 3,679    
Cash equivalents (a) [3] 471,372 497,503    
Cash and cash equivalents. $ 481,491 $ 501,182    
[1] (b)Bank accounts earn interest at floating rates based on market rates.
[2] (c)As of December 31, 2019 and 2018, time deposits were kept in prime financial institutions, which generated interest at annual market rates and have current maturities, according to the immediate cash needs of the Group.
[3] (a)Cash equivalents as of December 31, 2019, includes short-term deposits with Scotiabank Peru of US$125.0 million, Citibank NY of US$85.1 million, Banco BBVA Peru of US$50.0 million and a portfolio of investments in highly marketable liquid investments (investments classified as “AAA” by Standard & Poor’s and Moody’s) of US$211.3 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.