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INVENTORIES: (Tables)
6 Months Ended
Jun. 30, 2019
Schedule of inventories

At June 30, 

At December 31, 

(in millions)

    

2019

    

2018

Inventory, current:

Metals at average cost:

Finished goods

$

66.3

$

69.6

Work-in-process

 

271.4

 

256.8

Ore stockpiles on leach pads  

354.8

328.0

Supplies at average cost

 

376.1

 

378.3

Total current inventory

$

1,068.6

$

1,032.7

Inventory, long-term:

Ore stockpiles on leach pads

$

1,205.8

$

1,177.4