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INVENTORIES: (Tables)
 3 Months Ended
Mar. 31, 2018
INVENTORIES:  
Schedule of inventories

 

(in millions)

 

At March 31,
2018

 

At December 31,
2017

 

 

 

 

 

 

 

Inventory, current:

 

 

 

 

 

Metals at average cost:

 

 

 

 

 

Finished goods

 

$
59.3

 

$
48.8

 

Work-in-process

 
308.9

 
308.0

 

Ore stockpiles on leach pads

 
316.5

 
320.9

 

Supplies at average cost:

 
365.1

 
364.2

 

 

 

 

 

 

 

Total current inventory

 

$
1,049.8

 

$
1,041.9

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Inventory, non-current:

 

 

 

 

 

Ore stockpiles on leach pads

 

$
1,028.9

 

$
977.4