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INVENTORIES: (Tables)
6 Months Ended
Jun. 30, 2021
INVENTORIES:  
Schedule of inventories

At June 30, 

At December 31, 

(in millions)

    

2021

    

2020

Inventory, current:

Metals at average cost:

Finished goods

$

57.5

$

50.8

Work-in-process

 

263.3

 

248.9

Ore stockpiles on leach pads  

228.3

298.5

Supplies at average cost

 

344.8

 

352.0

Total current inventory

$

893.9

$

950.2

Inventory, long-term:

Ore stockpiles on leach pads

$

1,180.2

$

1,125.0