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COMMITMENTS AND CONTINGENCIES: - Others (Details)
S/ in Millions, $ in Millions
 1 Months Ended 6 Months Ended
Feb. 20, 2020
MWh
Jun. 30, 2022
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2018
USD ($)
T
May 31, 2016
MW
Jul. 31, 2014
MW
Jun. 30, 2014
MW
Jun. 30, 2023
USD ($)
item
Jun. 30, 2023
PEN (S/)
item
Dec. 31, 2022
USD ($)
Other commitments:                    
Property net book value   $ 9,521.8           $ 9,688.1   $ 9,596.6
Commitment for capital projects               $ 504.2    
Michiquillay                    
Other commitments:                    
Number of exploration platforms | item               10    
Pre-operational period   12 years                
Extended pre-operational period   3 years                
Investment in projects in next five years   $ 20.0                
Period of investment in projects   5 years                
Toquepala Concentrator Expansion | Peru                    
Other commitments:                    
Amount committed to funding for social and infrastructure improvement projects               $ 122.5 S/ 445.0  
Commitment liability recorded in the balance sheet               32.2    
Development Fund Moquegua Region | Peru                    
Other commitments:                    
Amount committed to funding for social and infrastructure improvement projects               $ 275.3 S/ 1,000.0  
Number of schools agreed for construction. | item               3 3  
Amount committed to funding for school projects               $ 5.0 S/ 18.2  
Copper | Michiquillay | Peru                    
Other commitments:                    
Contingent contractual obligation       $ 400.0            
Estimated mineralized material (in tons) | T       2,288,000,000            
Copper grade percentage       0.43%            
Annual production ( in tons) | T       225,000            
Initial mine life       25 years            
Contractual obligation paid on project     $ 12.5 $ 12.5            
Remaining amount to pay if project is developed     $ 375.0              
Educational Project | Toquepala Concentrator Expansion | Peru                    
Other commitments:                    
Amount committed to funding for social and infrastructure improvement projects               5.2 18.8  
Educational Project | Development Fund Moquegua Region | Peru                    
Other commitments:                    
Amount committed to funding for social and infrastructure improvement projects               29.8 108.4  
Construction of Cularjahuira Dam | Toquepala Concentrator Expansion | Peru                    
Other commitments:                    
Amount committed to funding for social and infrastructure improvement projects               4.3 15.6  
Study Of Engineering For Collazas Dam | Toquepala Concentrator Expansion | Peru                    
Other commitments:                    
Amount committed to funding for social and infrastructure improvement projects               0.7 2.6  
Infrastructure Projects | Toquepala Concentrator Expansion | Peru                    
Other commitments:                    
Amount committed to funding for social and infrastructure improvement projects               2.9 10.7  
Irrigation Systems Projects | Toquepala Concentrator Expansion | Peru                    
Other commitments:                    
Amount committed to funding for social and infrastructure improvement projects               1.1 4.1  
Water Treatment | Development Fund Moquegua Region | Peru                    
Other commitments:                    
Amount committed to funding for social and infrastructure improvement projects               29.0 105.5  
Amount committed for funding social and infrastructure improvement projects, build tracks and sidewalks               1.8 6.4  
Drinking Water Project | Toquepala Concentrator Expansion | Peru                    
Other commitments:                    
Amount committed to funding for social and infrastructure improvement projects               2.6 9.6  
Social Investment For Taxes | Toquepala Concentrator Expansion | Peru                    
Other commitments:                    
Amount committed to funding for social and infrastructure improvement projects               26.9 97.7  
Social Investment For Taxes | Development Fund Moquegua Region | Peru                    
Other commitments:                    
Amount committed to funding for social and infrastructure improvement projects               $ 42.0 S/ 152.6  
Number of Infrastructure Projects Agreed for Construction | item               4 4  
Social Investment For Taxes | Apurimac Region                    
Other commitments:                    
Number of schools agreed for construction. | item               2 2  
Amount committed to funding for school projects               $ 22.5 S/ 81.6  
Social Investment For Taxes | Arequipa Region                    
Other commitments:                    
Number of schools agreed for construction. | item               2 2  
Amount committed to funding for school projects               $ 23.5 S/ 85.3  
Amount committed to funding for sport infrastructure project               $ 0.2 S/ 0.7  
Electroperu S.A | Power purchase agreements | Peru                    
Other commitments:                    
Purchase agreement, contracted power capacity (in megawatts) | MW             120      
Term of power purchase agreement related to sale of power plant             20 years      
Parque Eolico de Fenicias, S. de R.L. de C.V | Power purchase agreements | Mexico                    
Other commitments:                    
Term of power purchase agreement related to sale of power plant 20 years                  
Purchase agreement, contracted power capacity (in megawatts per year) | MWh 611,400                  
Kallpa | Power purchase agreements | Peru                    
Other commitments:                    
Purchase agreement, contracted power capacity (in megawatts) | MW           120        
Term of power purchase agreement related to sale of power plant           10 years        
Kallpa | Power purchase agreements | Peru | Maximum                    
Other commitments:                    
Purchase agreement, contracted power capacity (in megawatts) | MW         80