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INVENTORIES: (Tables)
12 Months Ended
Dec. 31, 2021
INVENTORIES:  
Schedule of inventories

At December 31, 

(in millions)

2021

    

2020

Inventory, current:

Metals at average cost:

Finished goods

$

58.6

$

50.8

Work-in-process

 

340.7

 

248.9

Ore stockpiles on leach pads  

259.7

298.5

Supplies at average cost

 

313.9

 

352.0

Total current inventory

$

972.9

$

950.2

Inventory, long-term:

Ore stockpiles on leach pads

$

1,097.6

$

1,125.0