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SEGMENT AND RELATED INFORMATION: (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2016 USD ($) segment	Jun. 30, 2015 USD ($)	Dec. 31, 2015 USD ($)
Financial information related to segments
Number of reportable segments | segment			3
Financial information relating to segments
Net sales outside of segments	$ 1,335.1	$ 1,382.9	$ 2,580.1	$ 2,657.7
Cost of sales (exclusive of depreciation, amortization and depletion)	751.6	706.9	1,478.5	1,386.7
Selling, general and administrative	23.6	25.0	49.9	49.8
Depreciation, amortization and depletion	164.5	125.3	299.8	242.3
Exploration	10.3	12.1	20.7	22.4
Environmental remediation		10.5		16.5
Operating income	385.1	503.1	731.2	940.0
Interest, net	(70.0)	(51.2)	(142.8)	(74.2)
Other income (expense)	5.8	(1.5)	5.4	(5.4)
Income taxes	(102.0)	(157.0)	(194.2)	(286.2)
Equity earnings of affiliate	3.6	2.6	8.7	5.5
Non-controlling interest	(0.6)	(1.3)	(1.3)	(2.5)
Net income attributable to SCC	221.9	294.7	407.0	577.2
Capital investment	341.6	281.0	564.9	529.8
Property and mine development, net	8,498.4	7,691.7	8,498.4	7,691.7	$ 8,262.8
Total assets	12,787.4	13,215.8	12,787.4	13,215.8	$ 12,593.2
Corporate, other and eliminations
Financial information relating to segments
Net sales outside of segments	(19.4)	(15.5)	(34.5)	(34.4)
Cost of sales (exclusive of depreciation, amortization and depletion)	(65.1)	(9.8)	(106.0)	(19.7)
Selling, general and administrative	0.5	1.9	0.7	5.2
Depreciation, amortization and depletion	(11.4)	(0.4)	(4.8)	1.8
Exploration	3.4	4.6	7.1	9.2
Operating income	53.2	(11.8)	68.5	(30.9)
Capital investment		6.5	0.1	7.8
Property and mine development, net	253.1	295.8	253.1	295.8
Total assets	(723.9)	1,571.3	(723.9)	1,571.3
Mexican Open-pit | Operating segment
Financial information relating to segments
Net sales outside of segments	815.9	733.6	1,557.5	1,397.8
Cost of sales (exclusive of depreciation, amortization and depletion)	431.8	299.6	826.3	596.5
Selling, general and administrative	12.7	11.6	26.2	21.0
Depreciation, amortization and depletion	107.6	60.4	172.5	114.5
Exploration	1.4	1.0	3.0	1.8
Environmental remediation		10.5		16.5
Operating income	262.4	350.5	529.5	647.5
Capital investment	157.8	198.4	266.9	386.1
Property and mine development, net	5,068.5	4,662.5	5,068.5	4,662.5
Total assets	8,640.2	7,066.2	8,640.2	7,066.2
Mexican IMMSA Unit | Operating segment
Financial information relating to segments
Net sales outside of segments	82.7	87.0	152.7	177.4
Cost of sales (exclusive of depreciation, amortization and depletion)	73.3	77.5	142.0	167.2
Selling, general and administrative	1.8	1.5	3.3	3.3
Depreciation, amortization and depletion	14.4	7.9	23.8	15.6
Exploration	1.3	2.9	3.1	5.1
Operating income	11.3	12.7	15.0	20.6
Capital investment	10.7	8.8	17.5	15.4
Property and mine development, net	455.9	392.1	455.9	392.1
Total assets	790.4	837.1	790.4	837.1
Mexican IMMSA Unit | Intersegment sales
Financial information relating to segments
Net sales outside of segments	19.4	15.5	34.5	34.4
Peruvian Operations | Operating segment
Financial information relating to segments
Net sales outside of segments	436.5	562.3	869.9	1,082.5
Cost of sales (exclusive of depreciation, amortization and depletion)	311.6	339.6	616.2	642.7
Selling, general and administrative	8.6	10.0	19.7	20.3
Depreciation, amortization and depletion	53.9	57.4	108.3	110.4
Exploration	4.2	3.6	7.5	6.3
Operating income	58.2	151.7	118.2	302.8
Capital investment	173.1	67.3	280.4	120.5
Property and mine development, net	2,720.9	2,341.3	2,720.9	2,341.3
Total assets	$ 4,080.7	$ 3,741.2	$ 4,080.7	$ 3,741.2

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