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COMMITMENTS AND CONTINGENCIES: - Litigation Matters (Details)
$ in Millions
 1 Months Ended 3 Months Ended 12 Months Ended
Oct. 04, 2016
shares
Sep. 23, 2015
shares
Oct. 04, 2014
lawsuit
plaintiff
Apr. 30, 2017
T
Aug. 31, 2009
USD ($)
Apr. 30, 1996
person
Mar. 31, 2017
PEN
ha
item
lawsuit
item / shares
Dec. 31, 2012
item
Dec. 31, 2005
item
Mar. 31, 2012
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 litigation                    
Litigation Matter                    
Number of plaintiffs involved in lawsuits filed | plaintiff     800              
Number of lawsuits | lawsuit     13              
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%
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                  
Peru | Labor Matters                    
Litigation Matter                    
Percentage of labor unionized             73.00%      
Total number of workers             4,589      
Number of labor unions             5      
Number of labor unions represent majority of workers             1      
Number of labor unions other than majority workers unions             4      
Term of agreement             3 years      
Annual salary increase (as a percent)             5.00%      
Number of tons of copper decrease of production due to stoppage | T       1,418            
Mexico | Mexico Generadora de Energia S. de R.L. ("MGE")                    
Litigation Matter                    
Number of power plants               2 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%