FINANCING: (Tables)

12 Months Ended

Dec. 31, 2023

FINANCING:

Schedule of long-term debt

Long-term debt (in millions):

							Carrying
							value as of
	Face		Issuance		Issuance		December 31,
	amount		discount		costs		2023
3.875% Senior unsecured notes due 2025		500		(0.4)		(0.4)		499.2
9.250% Yankee bonds due 2028		51.2		—		—		51.2
7.500% Senior unsecured notes due 2035		1,000		(10.5)		(7.0)		982.5
6.750% Senior unsecured notes due 2040		1,100		(6.3)		(5.1)		1,088.6
5.250% Senior unsecured notes due 2042		1,200		(17.1)		(5.7)		1,177.2
5.875% Senior unsecured notes due 2045		1,500		(15.1)		(8.0)		1,476.9
4.500% Minera Mexico Senior unsecured notes due 2050		1,000		(11.8)		(9.2)		979.0
Total	$	6,351.2	$	(61.2)	$	(35.4)		6,254.6
Less, current portion								—
Total long-term debt							$	6,254.6

							Carrying
							value as of
	Face		Issuance		Issuance		December 31,
	amount		discount		costs		2022
3.875% Senior unsecured notes due 2025	$	500	$	(0.7)	$	(0.7)	$	498.6
9.250% Yankee bonds due 2028		51.2		—		—		51.2
7.500% Senior unsecured notes due 2035		1,000		(11.0)		(7.3)		981.7
6.750% Senior unsecured notes due 2040		1,100		(6.6)		(5.2)		1,088.2
5.250% Senior unsecured notes due 2042		1,200		(17.6)		(5.9)		1,176.5
5.875% Senior unsecured notes due 2045		1,500		(15.4)		(8.2)		1,476.4
4.500% Minera Mexico Senior unsecured notes due 2050		1,000		(12.1)		(9.3)		978.6
Total	$	6,351.2	$	(63.4)	$	(36.6)		6,251.2
Less, current portion								—
Total long-term debt							$	6,251.2

Schedule of aggregate maturities of the outstanding borrowings

	Principal
Years	Due(*)
	(in millions)
2024	$	—
2025		500.0
2026		—
2027		—
2028		51.2
Thereafter		5,800.0
Total	$	6,351.2

(*)Total debt maturities do not include the debt discount valuation account of $96.5 million.