Impairment of Long Lived Assets (Tables)

6 Months Ended

Jun. 30, 2013

Impairment of long lived assets

Schedule of details of components of the impairment of long lived assets

	Gross Value		Impairment Charges				Gross Value
	Prior to		Velardeña				After
	Impairment at		Operations		San Diego		Impairment at
	June 30, 2013		Asset Group		Asset Group		June 30, 2013
	(in thousands)
Mineral properties	$	239,200	$	211,609	$	—	$	27,591
Exploration properties	15,624		3,472		8,428		3,724
Royalty properties	200		—		—		200
Buildings	5,385		3,036		—		2,349
Mining equipment and machinery.	30,271		10,576		—		19,695
Other furniture and equipment	2,064		900		—		1,164
Asset retirement cost	2,087		—		—		2,087
	294,831		229,593		8,428		56,810

Velardena Operations

Impairment of long lived assets

Schedule of details of components of the impairment of long lived assets

	Net Book Value				Net Book Value
	Prior to				After
	Impairment at		Impairment		Impairment at
	June 30, 2013		Charges		June 30, 2013
	(in thousands)
Mineral properties	$	232,805	$	211,609	$	21,196
Exploration properties	3,472		3,472		—
Tangible assets	24,110		14,512		9,598
	260,387		229,593		30,794

San Diego exploration property

Impairment of long lived assets

Schedule of details of components of the impairment of long lived assets

	Net Book Value		Net Book Value
	Prior to		After
	Impairment at	Impairment	Impairment at
	June 30, 2013	Charges	June 30, 2013
	(in thousands)
Exploration properties	9,260	8,428	832
	9,260	8,428	832