Property, Plant, Equipment and Development (Tables)

6 Months Ended

Jun. 30, 2013

Property, Plant and Equipment [Abstract]

Schedule of property, plant, equipment and development

Property, plant, equipment and development was comprised of the following:

(in millions)	June 30, 2013			December 31, 2012
Mining properties and mineral reserves	$	976.4		$	978.0
Mining and milling equipment and facilities	481.4			467.5
Processing facilities	166.0			165.8
Construction-in-progress	1,251.1			1,089.0
Other	18.7			18.2
	2,893.6			2,718.5
Less: Accumulated depreciation, depletion and amortization	(208.0		)	(179.6		)
	$	2,685.6		$	2,538.9