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SEGMENT AND RELATED INFORMATION: (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($) segment	Sep. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)
Financial information related to segments
Number of reportable segments | segment			3
Financial information relating to segments
Net sales	$ 2,156.9	$ 2,680.9	$ 7,227.6	$ 8,110.4
Cost of sales (exclusive of depreciation, amortization and depletion)	1,137.9	927.5	3,442.3	2,856.8
Selling, general and administrative	30.2	31.3	91.4	92.9
Depreciation, amortization and depletion	192.0	203.4	597.6	599.4
Exploration	9.6	10.9	30.6	26.7
Operating income	787.2	1,507.8	3,065.7	4,534.6
Interest, net	(76.4)	(87.4)	(240.5)	(262.6)
Other income (expense)	38.7	(1.9)	54.4	(7.8)
Income taxes	(228.5)	(548.6)	(1,137.0)	(1,703.8)
Equity earnings of affiliate	(0.1)	1.3	0.3	14.4
Non-controlling interest	(1.9)	(3.6)	(6.8)	(10.6)
Net income attributable to SCC	519.0	867.6	1,736.1	2,564.2
Capital investment	227.9	243.1	657.6	695.5
Property net book value	9,554.5	9,476.1	9,554.5	9,476.1	$ 9,464.4
Total assets	17,083.2	18,110.3	17,083.2	18,110.3	$ 18,297.6
Corporate, other and eliminations
Financial information relating to segments
Net sales	(19.5)	(42.8)	(281.5)	(107.9)
Cost of sales (exclusive of depreciation, amortization and depletion)	(217.2)	(48.4)	(419.9)	(122.5)
Selling, general and administrative	1.3	2.9	8.4	8.4
Depreciation, amortization and depletion	10.3	9.4	29.8	28.4
Exploration	4.0	5.9	10.7	11.2
Operating income	182.1	(12.6)	89.5	(33.4)
Capital investment	(0.9)	2.3	5.0	6.8
Property net book value	675.9	656.5	675.9	656.5
Total assets	2,997.3	4,125.6	2,997.3	4,125.6
Reportable subsegments
Financial information relating to segments
Net sales	2,145.4	2,680.9	7,394.2	8,110.4
Intersegment sales
Financial information relating to segments
Net sales	11.5		(166.6)
Intersegment sales | Corporate, other and eliminations
Financial information relating to segments
Net sales	(19.5)	(42.8)	(281.5)	(107.9)
Mexican Open-Pit | Operating segment
Financial information relating to segments
Net sales	1,201.5	1,425.8	4,184.7	4,536.6
Cost of sales (exclusive of depreciation, amortization and depletion)	702.8	433.4	1,915.3	1,441.6
Selling, general and administrative	18.6	17.4	49.5	49.7
Depreciation, amortization and depletion	96.6	97.8	289.2	289.0
Exploration	0.6	0.6	1.7	1.8
Operating income	382.9	876.6	1,929.0	2,754.5
Capital investment	103.2	114.6	288.9	389.6
Property net book value	4,544.7	4,551.1	4,544.7	4,551.1
Total assets	8,318.9	8,200.6	8,318.9	8,200.6
Mexican Open-Pit | Reportable subsegments | Operating segment
Financial information relating to segments
Net sales	1,201.5	1,425.8	4,184.7	4,536.6
Mexican IMMSA Unit | Operating segment
Financial information relating to segments
Net sales	159.2	175.1	503.0	460.8
Cost of sales (exclusive of depreciation, amortization and depletion)	141.1	135.8	386.1	328.8
Selling, general and administrative	2.7	2.9	7.5	7.8
Depreciation, amortization and depletion	15.1	12.7	40.8	39.4
Exploration	1.7	1.7	4.0	3.8
Operating income	(1.4)	22.0	64.6	81.0
Capital investment	37.8	29.0	115.1	61.5
Property net book value	644.1	555.5	644.1	555.5
Total assets	1,079.8	1,009.9	1,079.8	1,009.9
Mexican IMMSA Unit | Reportable subsegments | Operating segment
Financial information relating to segments
Net sales	128.2	132.3	388.1	352.9
Mexican IMMSA Unit | Intersegment sales | Operating segment
Financial information relating to segments
Net sales	31.0	42.8	114.9	107.9
Peruvian Operations | Operating segment
Financial information relating to segments
Net sales	815.7	1,122.8	2,821.4	3,220.9
Cost of sales (exclusive of depreciation, amortization and depletion)	511.2	406.7	1,560.8	1,208.9
Selling, general and administrative	7.5	8.1	26.0	27.0
Depreciation, amortization and depletion	70.1	83.5	237.8	242.6
Exploration	3.3	2.7	14.1	9.9
Operating income	223.6	621.8	982.7	1,732.5
Capital investment	87.8	97.2	248.6	237.6
Property net book value	3,689.8	3,713.0	3,689.8	3,713.0
Total assets	4,687.2	4,774.2	4,687.2	4,774.2
Peruvian Operations | Reportable subsegments | Operating segment
Financial information relating to segments
Net sales	$ 815.7	$ 1,122.8	$ 2,821.4	$ 3,220.9

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