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INVENTORIES: (Tables)
9 Months Ended
Sep. 30, 2022
INVENTORIES:  
Schedule of inventories

At September 30, 

At December 31, 

(in millions)

    

2022

    

2021

Inventory, current:

Metals at average cost:

Finished goods

$

79.7

$

58.6

Work-in-process

 

376.7

 

340.7

Ore stockpiles on leach pads  

256.5

259.7

Supplies at average cost

 

340.4

 

313.9

Total current inventory

$

1,053.3

$

972.9

Inventory, long-term:

Ore stockpiles on leach pads

$

1,075.1

$

1,097.6