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INVENTORIES: (Tables)

12 Months Ended

Dec. 31, 2016

INVENTORIES:

Schedule of inventories

		At December 31,
(in millions)		2016			2015
Inventory, current:
Metals at average cost:
Finished goods		$	130.5		$	104.1
Work-in-process			231.6			188.6
Ore stockpiles on leach pads			310.9			243.2
Supplies at average cost			337.4			321.3
​	​	​	​	​	​	​	​
Total current inventory		$	1,010.4		$	857.2
​	​	​	​	​	​	​	​
​	​	​	​	​	​	​	​
Inventory, long-term:
Ore stockpiles on leach pads		$	806.9		$	752.3
​	​	​	​	​	​	​	​
​	​	​	​	​	​	​	​

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