INVENTORIES: (Tables)

3 Months Ended

Mar. 31, 2020

INVENTORIES:

Schedule of inventories

	At March 31,		At December 31,
(in millions)	2020		2019
Inventory, current:
Metals at average cost:
Finished goods	$	82.1	$	87.2
Work-in-process		263.8		259.7
Ore stockpiles on leach pads		385.1		358.4
Supplies at average cost		348.4		363.2
Total current inventory	$	1,079.4	$	1,068.5
Inventory, long-term:
Ore stockpiles on leach pads	$	1,149.0	$	1,230.3