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INVENTORIES: (Tables)
3 Months Ended
Mar. 31, 2023
INVENTORIES:  
Schedule of inventories

At March 31, 

At December 31, 

(in millions)

    

2023

    

2022

Inventory, current:

Metals at average cost:

Finished goods

$

66.5

$

78.5

Work-in-process

 

289.8

 

330.5

Ore stockpiles on leach pads  

260.2

259.7

Supplies at average cost

 

365.3

 

345.2

Total current inventory

$

981.8

$

1,013.9

Inventory, long-term:

Ore stockpiles on leach pads

$

1,066.9

$

1,064.3