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SEGMENT AND RELATED INFORMATION: (Tables)

6 Months Ended

Jun. 30, 2025

SEGMENT AND RELATED INFORMATION:

Schedule of financial information relating to Company's segments


		Three Months Ended June 30, 2025
		(in millions)
					Mexican									Corporate, other
		Mexican			IMMSA			Peruvian			Segment			and
		Open-pit			Unit			Operations			Total			eliminations			Consolidated
Net sales to external customers		$	1,754.8		$	118.0		$	1,178.2		$	3,051.0		$	—		$	3,051.0
Intersegment sales			—			61.3			—			61.3			(61.3)			(0.0)
Cost of sales (exclusive of depreciation, amortization and depletion)			650.7			134.1			500.9			1,285.7			(74.0)			1,211.7
Selling, general and administrative			17.2			3.0			9.7			29.9			2.6			32.5
Depreciation, amortization and depletion			96.5			20.8			76.1			193.4			12.8			206.2
Exploration			1.5			3.6			8.4			13.5			0.1			13.7
Operating income		$	988.9		$	17.8		$	583.1		$	1,589.8		$	(2.8)			1,587.0
Less:
Interest, net																		(40.8)
Other income (expense)																		(2.3)
Income before income taxes																	$	1,543.9
Capital investment		$	148.6		$	23.9		$	61.9		$	234.4		$	1.2		$	235.7
Property and mine development, net		$	4,899.5		$	780.5		$	3,790.3		$	9,470.3		$	444.6		$	9,915.0
Total assets		$	9,072.7		$	1,244.7		$	5,260.0		$	15,577.4		$	3,977.3		$	19,554.7


		Three Months Ended June 30, 2024
		(in millions)
					Mexican									Corporate, other
		Mexican			IMMSA			Peruvian			Segment			and
		Open-pit			Unit			Operations			Total			eliminations			Consolidated
Net sales to external customers		$	1,738.5		$	133.1		$	1,246.7		$	3,118.3		$	—		$	3,118.3
Intersegment sales			—			52.1			—			52.1			(52.1)			(0.0)
Cost of sales (exclusive of depreciation, amortization and depletion)			663.0			109.9			526.1			1,299.0			(50.1)			1,248.9
Selling, general and administrative			18.1			3.3			9.7			31.1			2.8			33.9
Depreciation, amortization and depletion			102.6			18.2			79.8			200.7			9.0			209.6
Exploration			2.4			2.6			10.7			15.7			2.9			18.6
Operating income		$	952.4		$	51.1		$	620.4		$	1,623.9		$	(16.7)			1,607.3
Less:
Interest, net																		(56.8)
Other income (expense)																		(19.9)
Income before income taxes																	$	1,530.6
Capital investment		$	234.7		$	29.4		$	65.9		$	330.0		$	1.8		$	331.8
Property and mine development, net		$	4,687.2		$	775.0		$	3,766.7		$	9,229.0		$	642.6		$	9,871.5
Total assets		$	9,164.4		$	1,214.7		$	5,735.6		$	16,114.7		$	1,663.0		$	17,777.7


		Six Months Ended June 30, 2025
		(in millions)
					Mexican									Corporate, other
		Mexican			IMMSA			Peruvian			Segment			and
		Open-pit			Unit			Operations			Total			eliminations			Consolidated
Net sales to external customers		$	3,504.2		$	224.5		$	2,444.2		$	6,172.9		$	—		$	6,172.9
Intersegment sales			—			110.2			—			110.2			(110.2)			(0.0)
Cost of sales (exclusive of depreciation, amortization and depletion)			1,318.7			246.1			1,098.0			2,662.8			(132.0)			2,530.9
Selling, general and administrative			34.1			5.8			18.7			58.5			5.6			64.1
Depreciation, amortization and depletion			194.2			40.6			170.7			405.4			24.5			430.0
Exploration			2.7			6.1			12.2			21.0			4.4			25.4
Operating income		$	1,954.4		$	36.2		$	1,144.6		$	3,135.3		$	(12.8)			3,122.5
Less:
Interest, net																		(84.1)
Other income (expense)																		(16.0)
Income before income taxes																	$	3,022.4
Capital investment		$	283.2		$	45.3		$	222.1		$	550.6		$	2.9		$	553.5
Property and mine development, net		$	4,899.5		$	780.5		$	3,790.3		$	9,470.3		$	444.6		$	9,915.0
Total assets		$	9,072.7		$	1,244.7		$	5,260.0		$	15,577.4		$	3,977.3		$	19,554.7


		Six Months Ended June 30, 2024
		(in millions)
					Mexican									Corporate, other
		Mexican			IMMSA			Peruvian			Segment			and
		Open-pit			Unit			Operations			Total			eliminations			Consolidated
Net sales to external customers		$	3,204.4		$	238.2		$	2,275.4		$	5,718.1		$	—		$	5,718.1
Intersegment sales			—			93.4			—			93.4			(93.4)			(0.0)
Cost of sales (exclusive of depreciation, amortization and depletion)			1,257.6			239.6			1,000.7			2,497.9			(91.5)			2,406.5
Selling, general and administrative			35.2			5.9			19.1			60.2			4.6			64.8
Depreciation, amortization and depletion			202.3			37.4			161.2			400.9			17.7			418.6
Exploration			6.0			4.4			16.5			26.8			4.4			31.2
Operating income		$	1,703.3		$	44.4		$	1,077.9		$	2,825.6		$	(28.7)			2,797.0
Less:
Interest, net																		(109.9)
Other income (expense)																		(0.9)
Income before income taxes																	$	2,686.2
Capital investment		$	341.7		$	61.2		$	136.4		$	539.4		$	6.2		$	545.6
Property and mine development, net		$	4,687.2		$	775.0		$	3,766.7		$	9,229.0		$	642.6		$	9,871.5
Total assets		$	9,164.4		$	1,214.7		$	5,735.6		$	16,114.7		$	1,663.0		$	17,777.7