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COMMITMENTS AND CONTINGENCIES: - Litigation Matters (Details)
$ in Millions
 1 Months Ended 12 Months Ended
Oct. 04, 2016
shares
Sep. 23, 2015
shares
Mar. 31, 2012
item
May 31, 2011
item
Mar. 31, 2015
item
Aug. 31, 2009
USD ($)
Apr. 30, 1996
person
Dec. 31, 2016
PEN
ha
item
lawsuit
item / shares
Dec. 31, 2012
item
Dec. 31, 1992
Dec. 31, 1978
Dec. 31, 1971
Litigation Matter                        
Damages sought by the plaintiff | PEN               PEN 3.876380680        
Tia Maria                        
Litigation Matter                        
Area of mining concession (in hectares) | ha               32,989.64        
Number of lawsuits | lawsuit               5        
Virgen Maria                        
Litigation Matter                        
Area of mining concession (in hectares) | ha               943.72        
Percentage of mining concession               2.90%        
Purchase price of shares paid to former stockholders | $           $ 2            
Garcia Ataucuri and Others against SCC's Peruvian Branch                        
Litigation Matter                        
Number of former Branch workers       216 104              
Armando Cornejo Flores Against SCC Peruvian Branch former workers                        
Litigation Matter                        
Number of former Branch workers     37                  
Garcia Ataucuri litigation                        
Litigation Matter                        
Number of plaintiffs involved in lawsuits filed               800        
Peru                        
Litigation Matter                        
Statutory participation of mine workers in pre-tax profit (as a percent)                   8.00%   10.00%
Statutory participation of mine workers in pre-tax profit paid in cash (as a percent)                   100.00% 4.00% 40.00%
Statutory participation of mine workers in pre-tax profit received as equity interest of enterprise (as a percent)                       60.00%
Percentage of pre-tax profits delivered as "labor shares"                     5.50%  
Peru | Garcia Ataucuri and Others against SCC's Peruvian Branch                        
Litigation Matter                        
Number of former employees who filed the complaint | person             900          
Damages sought by the plaintiff (includes old soles and labor shares)               38,763,806.80        
Face value of one labor share | item / shares               100        
Labor shares issued by the Branch (as a percent)               100.00%        
Plaintiffs do not represent the percent of SCC's eligible employees               100.00%        
Soles de oro equivalent to today's one sol               1,000,000,000        
Number of shares seized as security for damages sought (in shares) | shares   10,501,857                    
First labor share exchange ratio 10 10                    
Second labor share exchange ratio 1,000                      
Number of labor shares represented by plaintiffs | shares 10,185,700                      
Number of investment shares issued | shares 57,649,479                      
Mexico | Mexico Generadora de Energia S. de R.L. ("MGE")                        
Litigation Matter                        
Number of power plants                 2      
Mexico | Mexico Generadora de Energia S. de R.L. ("MGE") | Controladora de Infraestructura Energetica Mexico, S. A. de C. V.                        
Litigation Matter                        
Percentage of interest acquired                 99.999%