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SEGMENT AND RELATED INFORMATION: (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) segment	Jun. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Financial information related to segments
Number of reportable segments | segment			3
Financial information relating to segments
Net sales	$ 2,897.0	$ 1,785.4	$ 5,429.5	$ 3,505.1
Cost of sales (exclusive of depreciation, amortization and depletion)	985.5	976.7	1,929.3	1,932.4
Selling, general and administrative	31.4	31.4	61.6	60.6
Depreciation, amortization and depletion	195.4	193.8	396.0	386.8
Exploration	9.5	6.3	15.8	14.9
Operating income	1,675.2	577.2	3,026.8	1,110.4
Interest, net	(88.0)	(87.8)	(175.2)	(176.6)
Other income (expense)	(8.2)	(1.0)	(5.9)	(8.4)
Income taxes	(647.7)	(224.4)	(1,155.2)	(446.2)
Equity earnings of affiliate	5.1	(3.1)	13.1	(2.1)
Non-controlling interest	(3.7)	(1.4)	(7.0)	(2.8)
Net income attributable to SCC	932.7	259.5	1,696.6	474.3
Capital investment	219.8	113.3	452.4	214.3
Property and mine development, net	9,456.1	9,197.0	9,456.1	9,197.0	$ 9,458.7
Total assets	17,695.4	15,805.0	17,695.4	15,805.0	$ 16,946.5
Intersegment sales
Financial information relating to segments
Net sales	(38.8)	(21.5)	(65.0)	(48.3)
Corporate, other and eliminations
Financial information relating to segments
Net sales	(38.8)	(21.5)	(65.0)	(48.3)
Cost of sales (exclusive of depreciation, amortization and depletion)	(42.8)	(27.5)	(74.2)	(60.0)
Selling, general and administrative	2.7	2.1	5.5	3.1
Depreciation, amortization and depletion	9.3	9.6	19.0	19.3
Exploration	4.7	0.8	5.3	4.2
Operating income	(12.7)	(6.5)	(20.6)	(14.9)
Capital investment	2.3	2.6	4.5	4.9
Property and mine development, net	604.5	514.3	604.5	514.3
Total assets	4,013.9	3,081.3	4,013.9	3,081.3
Reportable subsegments
Financial information relating to segments
Net sales	2,897.0	1,785.4	5,429.5	3,505.1
Mexican Open-pit | Operating segment
Financial information relating to segments
Net sales	1,632.2	1,016.7	3,110.7	1,970.4
Cost of sales (exclusive of depreciation, amortization and depletion)	498.3	526.4	1,008.2	991.4
Selling, general and administrative	16.4	19.2	32.3	35.9
Depreciation, amortization and depletion	95.6	93.6	191.2	185.0
Exploration	0.7	0.8	1.2	1.5
Operating income	1,021.2	376.7	1,877.8	756.6
Capital investment	125.4	65.5	275.0	103.7
Property and mine development, net	4,609.8	4,400.1	4,609.8	4,400.1
Total assets	7,874.8	7,150.2	7,874.8	7,150.2
Mexican Open-pit | Reportable subsegments | Operating segment
Financial information relating to segments
Net sales	1,632.2	1,016.7	3,110.7	1,970.4
Mexican IMMSA Unit | Operating segment
Financial information relating to segments
Net sales	161.4	101.6	285.7	236.1
Cost of sales (exclusive of depreciation, amortization and depletion)	112.6	81.9	193.0	194.1
Selling, general and administrative	2.8	1.8	4.9	4.2
Depreciation, amortization and depletion	12.8	10.3	26.7	20.9
Exploration	0.9	2.2	2.1	5.1
Operating income	32.3	5.4	59.0	11.8
Capital investment	18.2	14.4	32.5	39.7
Property and mine development, net	546.0	506.7	546.0	506.7
Total assets	994.5	824.1	994.5	824.1
Mexican IMMSA Unit | Intersegment sales
Financial information relating to segments
Net sales	38.8	21.5	65.0	48.3
Mexican IMMSA Unit | Reportable subsegments | Operating segment
Financial information relating to segments
Net sales	122.6	80.1	220.7	187.8
Peruvian Operations | Operating segment
Financial information relating to segments
Net sales	1,142.2	688.6	2,098.1	1,346.9
Cost of sales (exclusive of depreciation, amortization and depletion)	417.4	395.9	802.3	806.9
Selling, general and administrative	9.5	8.3	18.9	17.4
Depreciation, amortization and depletion	77.7	80.3	159.1	161.6
Exploration	3.2	2.5	7.2	4.1
Operating income	634.4	201.6	1,110.6	356.9
Capital investment	73.9	30.8	140.4	66.0
Property and mine development, net	3,695.8	3,775.9	3,695.8	3,775.9
Total assets	4,812.2	4,749.4	4,812.2	4,749.4
Peruvian Operations | Reportable subsegments | Operating segment
Financial information relating to segments
Net sales	$ 1,142.2	$ 688.6	$ 2,098.1	$ 1,346.9

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