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Cash and cash equivalents (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Cash and cash equivalents        
Cash $ 173 $ 304    
Bank accounts (b) [1] 185,276 37,836    
Time deposits (c) [2] 50,000 171,906    
Cash and cash equivalents. 235,449 210,046 $ 369,200 $ 214,551
Minera Yanacocha SRL and subsidiary [Member]        
Cash and cash equivalents        
Cash 22 22    
Bank accounts (b) 51,279 56,822    
Time deposits (c) 819,628 761,659    
Cash and cash equivalents. 870,929 818,503    
Sociedad Minera Cerro Verde S.A.A. [Member]        
Cash and cash equivalents        
Cash equivalents [3] 529,820 471,372    
Bank accounts (b) 3,910 10,119    
Cash and cash equivalents. $ 533,730 $ 481,491    
[1] (b)Bank accounts earn interest at floating rates based on market rates.
[2] (c)As of December 31, 2020 and 2019, 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, 2020, includes short-term deposits with Scotiabank Peru of US$125.0 million, Citibank NY of US$92.3 million and a portfolio of investments in highly marketable liquid investments (investments classified as “AAA” by Standard & Poor’s and Moody’s) of US$312.5 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.