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SEGMENT AND RELATED INFORMATION: (Tables)

9 Months Ended

Sep. 30, 2025

SEGMENT AND RELATED INFORMATION:

Schedule of financial information relating to Company's segments


		Three Months Ended September 30, 2025
		(in millions)
					Mexican									Corporate, other
		Mexican			IMMSA			Peruvian			Segment			and
		Open-pit			Unit			Operations			Total			eliminations			Consolidated
Net sales to external customers		$	1,905.2		$	170.5		$	1,301.6		$	3,377.3		$	—		$	3,377.3
Intersegment sales			39.6			29.3			—			69.0			(69.0)			0.0
Cost of sales (exclusive of depreciation, amortization and depletion)			763.2			126.0			539.8			1,429.0			(72.1)			1,356.8
Selling, general and administrative			18.3			3.2			10.6			32.1			1.6			33.7
Depreciation, amortization and depletion			98.6			21.6			75.8			196.0			11.8			207.8
Exploration			1.9			2.7			4.8			9.4			0.8			10.2
Operating income		$	1,062.8		$	46.3		$	670.7		$	1,779.8		$	(11.0)			1,768.8
Less:
Interest, net																		(43.5)
Other income (expense)																		(1.1)
Income before income taxes																	$	1,724.1
Capital investment		$	164.5		$	33.5		$	146.7		$	344.7		$	4.4		$	349.2
Property and mine development, net		$	4,849.3		$	782.8		$	3,855.1		$	9,487.2		$	515.0		$	10,002.1
Total assets		$	9,013.3		$	1,290.1		$	5,564.9		$	15,868.3		$	4,463.5		$	20,331.8


		Three Months Ended September 30, 2024
		(in millions)
					Mexican									Corporate, other
		Mexican			IMMSA			Peruvian			Segment			and
		Open-pit			Unit			Operations			Total			eliminations			Consolidated
Net sales to external customers		$	1,596.7		$	144.3		$	1,189.9		$	2,930.9		$	—		$	2,930.9
Intersegment sales			6.0			40.6			—			46.6			(46.6)			0.0
Cost of sales (exclusive of depreciation, amortization and depletion)			612.7			123.2			543.9			1,279.8			(56.8)			1,223.1
Selling, general and administrative			17.1			3.2			9.1			29.4			1.8			31.2
Depreciation, amortization and depletion			105.4			19.3			79.9			204.6			8.5			213.1
Exploration			1.3			2.6			7.3			11.2			2.0			13.2
Operating income		$	866.2		$	36.6		$	549.7		$	1,452.5		$	(2.2)			1,450.3
Less:
Interest, net																		(44.8)
Other income (expense)																		21.2
Income before income taxes																	$	1,426.7
Capital investment		$	145.2		$	30.2		$	67.2		$	242.6		$	3.7		$	246.4
Property and mine development, net		$	4,852.6		$	784.9		$	3,776.5		$	9,414.0		$	513.1		$	9,927.1
Total assets		$	8,975.0		$	1,196.6		$	5,473.9		$	15,645.5		$	2,770.0		$	18,415.5


		Nine Months Ended September 30, 2025
		(in millions)
					Mexican									Corporate, other
		Mexican			IMMSA			Peruvian			Segment			and
		Open-pit			Unit			Operations			Total			eliminations			Consolidated
Net sales to external customers		$	5,409.4		$	395.0		$	3,745.8		$	9,550.2		$	—		$	9,550.2
Intersegment sales			39.6			139.5			—			179.2			(179.2)			0.0
Cost of sales (exclusive of depreciation, amortization and depletion)			2,081.9			372.1			1,637.8			4,091.8			(204.1)			3,887.7
Selling, general and administrative			52.3			9.0			29.3			90.6			7.3			97.9
Depreciation, amortization and depletion			292.8			62.2			246.4			601.5			36.3			637.7
Exploration			4.7			8.8			17.0			30.4			5.2			35.6
Operating income		$	3,017.3		$	82.5		$	1,815.3		$	4,915.1		$	(23.8)			4,891.3
Less:
Interest, net																		(127.6)
Other income (expense)																		(17.2)
Income before income taxes																	$	4,746.6
Capital investment		$	447.7		$	78.8		$	368.8		$	895.3		$	7.4		$	902.7
Property and mine development, net		$	4,849.3		$	782.8		$	3,855.1		$	9,487.2		$	515.0		$	10,002.1
Total assets		$	9,013.3		$	1,290.1		$	5,564.9		$	15,868.3		$	4,463.5		$	20,331.8


		Nine Months Ended September 30, 2024
		(in millions)
					Mexican									Corporate, other
		Mexican			IMMSA			Peruvian			Segment			and
		Open-pit			Unit			Operations			Total			eliminations			Consolidated
Net sales to external customers		$	4,801.1		$	382.5		$	3,465.3		$	8,649.0		$	—		$	8,649.0
Intersegment sales			6.0			134.0			—			140.1			(140.1)			0.0
Cost of sales (exclusive of depreciation, amortization and depletion)			1,870.3			362.8			1,544.6			3,777.8			(148.3)			3,629.6
Selling, general and administrative			52.3			9.1			28.2			89.6			6.4			96.0
Depreciation, amortization and depletion			307.7			56.7			241.1			605.5			26.2			631.7
Exploration			7.3			7.0			23.8			38.0			6.4			44.4
Operating income		$	2,569.6		$	80.9		$	1,627.6		$	4,278.1		$	(30.8)			4,247.3
Less:
Interest, net																		(154.7)
Other income (expense)																		20.3
Income before income taxes																	$	4,112.9
Capital investment		$	486.9		$	91.5		$	203.6		$	782.0		$	10.0		$	792.0
Property and mine development, net		$	4,852.6		$	784.9		$	3,776.5		$	9,414.0		$	513.1		$	9,927.1
Total assets		$	8,975.0		$	1,196.6		$	5,473.9		$	15,645.5		$	2,770.0		$	18,415.5