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INVENTORIES: (Tables)
3 Months Ended
Mar. 31, 2022
INVENTORIES:  
Schedule of inventories

At March 31, 

At December 31, 

(in millions)

    

2022

    

2021

Inventory, current:

Metals at average cost:

Finished goods

$

79.1

$

58.6

Work-in-process

 

381.8

 

340.7

Ore stockpiles on leach pads  

260.7

259.7

Supplies at average cost

 

308.3

 

313.9

Total current inventory

$

1,029.9

$

972.9

Inventory, long-term:

Ore stockpiles on leach pads

$

1,082.0

$

1,097.6