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COMMITMENTS AND CONTINGENCIES: - Others (Details)
S/ in Millions, $ in Millions
 1 Months Ended 3 Months Ended
Feb. 20, 2020
MWh
Jun. 30, 2022
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2018
USD ($)
T
May 31, 2016
MW
Jul. 31, 2014
MW
Jun. 30, 2014
MW
Mar. 31, 2024
USD ($)
item
Mar. 31, 2024
PEN (S/)
item
Mar. 31, 2024
PEN (S/)
Dec. 31, 2023
USD ($)
Mar. 31, 2023
USD ($)
Other commitments:                        
Property net book value               $ 9,783.2     $ 9,782.9 $ 9,613.9
Commitment for capital projects               $ 314.7        
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               80,000 80,000      
Number of core samples obtained | item               27,902 27,902      
Period of investment in projects   5 years                    
Toquepala Concentrator Expansion | Peru                        
Other commitments:                        
Amount committed to funding for social and infrastructure improvement projects               $ 5.1 S/ 445.0      
Commitment liability recorded in the balance sheet               14.3        
Amount committed to funding for social and infrastructure improvement projects | S/                 18.8      
Development Fund Moquegua Region | Peru                        
Other commitments:                        
Amount committed to funding for social and infrastructure improvement projects               $ 268.7 S/ 1,000.0      
Number of schools agreed for construction. | item               3 3      
Amount committed to funding for school projects               $ 4.9 S/ 18.2      
Amount committed for funding social and infrastructure improvement projects, build tracks and sidewalks               1.9 7.0      
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               67.5 251.3      
Educational Project | Toquepala Concentrator Expansion | Peru                        
Other commitments:                        
Amount committed to funding for social and infrastructure improvement projects               119.6        
Educational Project | Development Fund Moquegua Region | Peru                        
Other commitments:                        
Amount committed to funding for social and infrastructure improvement projects               28.7 108.4      
Amount of investment in project               28.4   S/ 106.7    
Construction of Cularjahuira Dam | Toquepala Concentrator Expansion | Peru                        
Other commitments:                        
Amount committed to funding for social and infrastructure improvement projects               4.2 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 S/ 4.1      
Number of irrigation system | item               3 3      
Water Treatment | Development Fund Moquegua Region | Peru                        
Other commitments:                        
Amount committed to funding for social and infrastructure improvement projects               $ 28.2 S/ 105.5      
Percentage of progress on construction               38.00% 38.00%      
Drinking Water Project | Toquepala Concentrator Expansion | Peru                        
Other commitments:                        
Amount committed to funding for social and infrastructure improvement projects               $ 2.6 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               1.7 6.2      
Works For Taxes | Toquepala Concentrator Expansion | Peru                        
Other commitments:                        
Amount committed to funding for social and infrastructure improvement projects               26.3 97.7      
Works For Taxes | Development Fund Moquegua Region | Peru                        
Other commitments:                        
Amount committed to funding for social and infrastructure improvement projects               $ 62.6 S/ 233.0      
Number of Infrastructure Projects Agreed for Construction | item               3 3      
Amount financed per-investment studies for basic sanitation               $ 0.1 S/ 0.3      
Works 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/ 83.7      
Works For Taxes | Arequipa Region                        
Other commitments:                        
Number of schools agreed for construction. | item               2 2      
Amount committed to funding for school projects               $ 28.6 S/ 106.3      
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