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INVENTORIES: (Tables)
12 Months Ended
Dec. 31, 2023
INVENTORIES:  
Schedule of inventories

At December 31, 

(in millions)

2023

    

2022

Inventory, current:

Metals at average cost:

Finished goods

$

68.8

$

78.5

Work-in-process

 

313.0

 

330.5

Ore stockpiles on leach pads  

230.9

259.7

Supplies at average cost

 

404.2

 

345.2

Total current inventory

$

1,016.9

$

1,013.9

Inventory, long-term:

Ore stockpiles on leach pads

$

1,121.7

$

1,064.3