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INVENTORIES: (Tables)
6 Months Ended
Jun. 30, 2023
INVENTORIES:  
Schedule of inventories

At June 30, 

At December 31, 

(in millions)

    

2023

    

2022

Inventory, current:

Metals at average cost:

Finished goods

$

55.6

$

78.5

Work-in-process

 

303.9

 

330.5

Ore stockpiles on leach pads  

252.3

259.7

Supplies at average cost

 

373.5

 

345.2

Total current inventory

$

985.3

$

1,013.9

Inventory, long-term:

Ore stockpiles on leach pads

$

1,077.4

$

1,064.3