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INVENTORIES: (Tables)
9 Months Ended
Sep. 30, 2023
INVENTORIES:  
Schedule of inventories

At September 30, 

At December 31, 

(in millions)

    

2023

    

2022

Inventory, current:

Metals at average cost:

Finished goods

$

54.6

$

78.5

Work-in-process

 

282.6

 

330.5

Ore stockpiles on leach pads  

245.1

259.7

Supplies at average cost

 

393.2

 

345.2

Total current inventory

$

975.5

$

1,013.9

Inventory, long-term:

Ore stockpiles on leach pads

$

1,089.6

$

1,064.3