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SEGMENT AND RELATED INFORMATION: (Details) $ in Millions	3 Months Ended
	Mar. 31, 2021 USD ($) segment	Mar. 31, 2020 USD ($)	Dec. 31, 2020 USD ($)
Financial information related to segments
Number of reportable segments | segment	3
Financial information relating to segments
Net sales	$ 2,532.5	$ 1,719.7
Cost of sales (exclusive of depreciation, amortization and depletion)	943.8	955.8
Selling, general and administrative	30.1	29.1
Depreciation, amortization and depletion	200.6	192.9
Exploration	6.4	8.6
Operating income	1,351.6	533.3
Interest, net	(87.2)	(89.0)
Other income (expense)	2.3	(7.4)
Income taxes	(507.5)	(221.7)
Equity earnings of affiliate	7.9	1.0
Non-controlling interest	(3.3)	(1.4)
Net income attributable to SCC	763.8	214.8
Capital investment	232.6	101.0
Property and mine development, net	9,454.4	9,288.7	$ 9,458.7
Total assets	17,217.8	16,212.1	$ 16,946.5
Intersegment sales
Financial information relating to segments
Net sales	(26.1)	(26.8)
Corporate, other and eliminations
Financial information relating to segments
Net sales	(26.1)	(26.8)
Cost of sales (exclusive of depreciation, amortization and depletion)	(31.5)	(32.5)
Selling, general and administrative	2.7	0.9
Depreciation, amortization and depletion	9.7	9.6
Exploration	0.6	3.4
Operating income	(7.6)	(8.2)
Capital investment	2.2	2.3
Property and mine development, net	544.9	529.8
Total assets	3,639.2	3,651.5
Reportable subsegments
Financial information relating to segments
Net sales	2,532.5	1,719.7
Mexican Open-pit | Operating segment
Financial information relating to segments
Net sales	1,478.5	953.7
Cost of sales (exclusive of depreciation, amortization and depletion)	509.9	465.1
Selling, general and administrative	15.9	16.7
Depreciation, amortization and depletion	95.6	91.4
Exploration	0.5	0.7
Operating income	856.6	379.8
Capital investment	149.6	38.2
Property and mine development, net	4,653.8	4,420.7
Total assets	7,698.0	7,057.2
Mexican Open-pit | Reportable subsegments | Operating segment
Financial information relating to segments
Net sales	1,478.5	953.7
Mexican IMMSA Unit | Operating segment
Financial information relating to segments
Net sales	124.3	134.5
Cost of sales (exclusive of depreciation, amortization and depletion)	80.4	112.2
Selling, general and administrative	2.1	2.4
Depreciation, amortization and depletion	13.9	10.6
Exploration	1.3	2.9
Operating income	26.6	6.4
Capital investment	14.3	25.3
Property and mine development, net	548.4	505.7
Total assets	965.1	815.9
Mexican IMMSA Unit | Intersegment sales
Financial information relating to segments
Net sales	26.1	26.8
Mexican IMMSA Unit | Reportable subsegments | Operating segment
Financial information relating to segments
Net sales	98.2	107.7
Peruvian Operations | Operating segment
Financial information relating to segments
Net sales	955.8	658.3
Cost of sales (exclusive of depreciation, amortization and depletion)	385.0	411.0
Selling, general and administrative	9.4	9.1
Depreciation, amortization and depletion	81.4	81.3
Exploration	4.0	1.6
Operating income	476.0	155.3
Capital investment	66.5	35.2
Property and mine development, net	3,707.3	3,832.5
Total assets	4,915.5	4,687.5
Peruvian Operations | Reportable subsegments | Operating segment
Financial information relating to segments
Net sales	$ 955.8	$ 658.3

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