INVENTORIES: (Tables)

12 Months Ended

Dec. 31, 2020

INVENTORIES:

Schedule of inventories

	At December 31,
(in millions)	2020		2019
Inventory, current:
Metals at average cost:
Finished goods	$	50.8	$	87.2
Work-in-process		248.9		259.7
Ore stockpiles on leach pads		298.5		358.4
Supplies at average cost		352.0		363.2
Total current inventory	$	950.2	$	1,068.5
Inventory, long-term:
Ore stockpiles on leach pads	$	1,125.0	$	1,230.3