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COMMITMENTS AND CONTINGENCIES: - Others (Details)
S/ in Millions, $ in Millions
 1 Months Ended 9 Months Ended
Feb. 20, 2020
MWh
Jun. 30, 2022
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2018
USD ($)
T
May 31, 2016
MW
Jul. 31, 2014
MW
Jun. 30, 2014
MW
Sep. 30, 2023
USD ($)
item
Sep. 30, 2023
PEN (S/)
item
Sep. 30, 2023
PEN (S/)
Dec. 31, 2022
USD ($)
Sep. 30, 2022
USD ($)
Other commitments:                        
Property net book value               $ 9,730.8     $ 9,596.6 $ 9,554.5
Commitment for capital projects               $ 423.2        
Michiquillay                        
Other commitments:                        
Pre-operational period   12 years                    
Extended pre-operational period   3 years                    
Investment in projects in next five years   $ 20.0                    
Number of meters drilled | item               46,500 46,500      
Number of core samples obtained | item               14,892 14,892      
Period of investment in projects   5 years                    
Toquepala Concentrator Expansion | Peru                        
Other commitments:                        
Amount committed to funding for social and infrastructure improvement projects               $ 117.2 S/ 445.0      
Commitment liability recorded in the balance sheet               29.8        
Development Fund Moquegua Region | Peru                        
Other commitments:                        
Amount committed to funding for social and infrastructure improvement projects               $ 263.4 S/ 1,000.0      
Number of schools agreed for construction. | item               3 3      
Amount committed to funding for school projects               $ 4.8 S/ 18.2      
Amount committed for funding social and infrastructure improvement projects, build tracks and sidewalks               1.7 6.4      
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                  
Funding for Different Projects | Development Fund Moquegua Region | Peru                        
Other commitments:                        
Amount committed to funding for social and infrastructure improvement projects               64.4 244.4      
Educational Project | Toquepala Concentrator Expansion | Peru                        
Other commitments:                        
Amount committed to funding for social and infrastructure improvement projects               5.0 18.8      
Educational Project | Development Fund Moquegua Region | Peru                        
Other commitments:                        
Amount committed to funding for social and infrastructure improvement projects               28.5 108.4      
Amount of investment in project               28.1   S/ 106.6    
Construction of Cularjahuira Dam | Toquepala Concentrator Expansion | Peru                        
Other commitments:                        
Amount committed to funding for social and infrastructure improvement projects               4.1 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               2.8 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               $ 27.8 S/ 105.5      
Percentage of progress on construction               19.00% 19.00%      
Drinking Water Project | Toquepala Concentrator Expansion | Peru                        
Other commitments:                        
Amount committed to funding for social and infrastructure improvement projects               $ 2.5 S/ 9.6      
Feasibility Studies and Minor Projects | Development Fund Moquegua Region | Peru                        
Other commitments:                        
Amount committed to funding for social and infrastructure improvement projects               1.6 5.9      
Social Investment For Taxes | Toquepala Concentrator Expansion | Peru                        
Other commitments:                        
Amount committed to funding for social and infrastructure improvement projects               25.7 97.7      
Social Investment For Taxes | Development Fund Moquegua Region | Peru                        
Other commitments:                        
Amount committed to funding for social and infrastructure improvement projects               $ 37.8 S/ 143.6      
Number of Infrastructure Projects Agreed for Construction | item               3 3      
Amount financed per-investment studies for basic sanitation               $ 0.1 S/ 0.3      
Social Investment For Taxes | Apurimac Region                        
Other commitments:                        
Number of schools agreed for construction. | item               2 2      
Amount committed to funding for school projects               $ 21.5 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               $ 27.5 S/ 104.3      
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