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INVENTORIES: (Tables)
9 Months Ended
Sep. 30, 2021
INVENTORIES:  
Schedule of inventories

At September 30, 

At December 31, 

(in millions)

    

2021

    

2020

Inventory, current:

Metals at average cost:

Finished goods

$

61.3

$

50.8

Work-in-process

 

278.1

 

248.9

Ore stockpiles on leach pads  

231.0

298.5

Supplies at average cost

 

342.1

 

352.0

Total current inventory

$

912.5

$

950.2

Inventory, long-term:

Ore stockpiles on leach pads

$

1,171.1

$

1,125.0