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SEGMENT AND RELATED INFORMATION: - Sales (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 18)	$ 10,047.9	$ 10,934.1	$ 7,984.9
Copper
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 18)	7,538.8	8,828.3	6,513.1
Molybdenum
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 18)	1,192.7	1,053.1	510.3
Silver
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 18)	374.2	289.5	249.4
Zinc
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 18)	402.6	474.4	447.8
Other
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 18)	539.7	288.8	264.3
Corporate, other and eliminations
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 18)	(299.7)	(145.9)	(111.0)
Corporate, other and eliminations | Copper
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 18)	(220.0)	(74.1)	(48.4)
Corporate, other and eliminations | Silver
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 18)	0.4	0.5	1.6
Corporate, other and eliminations | Zinc
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 18)	(68.4)	(64.1)	(55.5)
Corporate, other and eliminations | Other
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 18)	(11.7)	(8.2)	(8.7)
Mexican Open-Pit
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 18)	5,772.6	6,109.0	4,412.4
Mexican Open-Pit | Operating segment
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 18)	5,772.6	6,109.0	4,412.4
Mexican Open-Pit | Operating segment | Copper
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 18)	4,579.2	5,182.1	3,762.1
Mexican Open-Pit | Operating segment | Molybdenum
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 18)	705.3	538.4	275.2
Mexican Open-Pit | Operating segment | Zinc
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 18)	241.9	252.8	235.5
Mexican Open-Pit | Operating segment | Other
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 18)	246.3	135.7	139.6
Mexican IMMSA Unit
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 18)	666.5	600.2	529.9
Mexican IMMSA Unit | Operating segment
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 18)	666.5	600.2	529.9
Mexican IMMSA Unit | Operating segment | Copper
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 18)	83.6	94.9	72.1
Mexican IMMSA Unit | Operating segment | Silver
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 18)	373.8	289.0	247.8
Mexican IMMSA Unit | Operating segment | Zinc
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 18)	133.8	152.7	155.8
Mexican IMMSA Unit | Operating segment | Other
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 18)	75.3	63.6	54.2
Peruvian Operations
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 18)	3,908.5	4,370.8	3,153.6
Peruvian Operations | Operating segment
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 18)	3,908.5	4,370.8	3,153.6
Peruvian Operations | Operating segment | Copper
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 18)	3,096.0	3,625.4	2,727.3
Peruvian Operations | Operating segment | Molybdenum
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 18)	487.4	514.7	235.1
Peruvian Operations | Operating segment | Zinc
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 18)	95.3	133.0	112.0
Peruvian Operations | Operating segment | Other
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 18)	$ 229.8	$ 97.7	$ 79.2

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