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INVENTORIES: (Tables)
3 Months Ended
Mar. 31, 2021
INVENTORIES:  
Schedule of inventories

At March 31, 

At December 31, 

(in millions)

    

2021

    

2020

Inventory, current:

Metals at average cost:

Finished goods

$

57.9

$

50.8

Work-in-process

 

229.5

 

248.9

Ore stockpiles on leach pads  

250.4

298.5

Supplies at average cost

 

342.9

 

352.0

Total current inventory

$

880.7

$

950.2

Inventory, long-term:

Ore stockpiles on leach pads

$

1,156.3

$

1,125.0