Impairment of Long Lived Assets (Tables)

12 Months Ended

Dec. 31, 2013

Impairment of long lived assets

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

	Impairment Charges
	Velardeña
	Properties		San Diego		Total
	Asset Group		Asset Group		Impairment
Mineral properties	$	217,524	$	—	$	217,524
Exploration properties	3,472		8,659		12,131
Royalty properties	—		—		—
Buildings	3,036		—		3,036
Mining equipment and machinery	10,394		—		10,394
Other furniture and equipment	900		—		900
Asset retirement cost	—				—
	235,326		8,659		243,985

Velardena Properties Asset Group

Impairment of long lived assets

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

	Net Book Value				Net Book Value				Net Book Value
	Prior to		Jun. 30, 2013		After		Dec. 31, 2013		After
	Impairment at		Impairment		Impairment at		Impairment		Impairment at
	Jun. 30, 2013		Charges		Jun. 30, 2013		Charges		Dec. 31, 2013
	(in thousands)
Mineral properties (1)	$	232,805	$	211,608	$	21,197	$	5,916	$	15,384
Exploration properties	3,472		3,472		—		—		—
Tangible assets (2)	23,928		14,330		9,598		—		8,485
	$	260,205	$	229,410	$	30,795	$	5,916	$	23,869

(1) The December 31, 2013 mineral properties net book value reflects a $0.1 million adjustment recorded during the fourth quarter of 2013 in addition to the impairment charge.

(2) The December 31, 2013 tangible assets net book value reflects depreciation and asset disposals recorded during the third and fourth quarters of 2013.

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				Net Book Value
	Prior to		Jun. 30, 2013		After		Dec. 31, 2013		After
	Impairment at		Impairment		Impairment at		Impairment		Impairment at
	Jun. 30, 2013		Charges		Jun. 30, 2013		Charges		Dec. 31, 2013
	(in thousands)
Exploration properties	$	9,260	$	8,428	$	832	$	231	$	601
	$	9,260	$	8,428	$	832	$	231	$	601