CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Cash flows (used in) from operating activities:
Cash paid to suppliers and employees	$ (74,359)	$ (65,760)
Cash received from gold and silver sales	34,711
Proceeds from sale of gold and silver bullion	1,467	23,836
Dividend received from Minera Santa Cruz S.A.	1,242	2,154
Interest received	139	125
Cash used in operating activities	(36,800)	(39,645)
Cash flows (used in) provided by investing activities:
Cash and short-term investments received from acquisition of Minera Andes Inc.		36,337
Short-term investments (net)		3,933
Acquisition of mineral property interests	(150)	(712)
Additions to property and equipment	(3,710)	(1,769)
Proceeds from disposal of mineral property interests and property and equipment	1,449	3,143
Proceeds from sale of marketable securities		409
Cash provided by investing activities	(2,411)	41,341
Cash flows from financing activities:
Exercise of stock options	171	3,564
Cash provided by financing activities	171	3,564
Effect of exchange rate change on cash and cash equivalents	(819)	(156)
(Decrease) increase in cash and cash equivalents	(39,859)	5,104
Cash and cash equivalents, beginning of period	70,921	13,416
Cash and cash equivalents, end of period	31,062	18,520
Reconciliation of net loss to cash used in operating activities:
Net loss	(136,399)	(40,369)
Adjustments to reconcile net loss from operating activities:
Impairment of investment in Minera Santa Cruz S.A.	95,878
Impairment of mineral property interests and property and equipment	34,016	3,081
Loss (gain) on sale of assets	6,741	(1,265)
Loss on sale of marketable securities		70
Income on investment in Minera Santa Cruz S.A., net of amortization	(252)	(14,968)
Recovery of income taxes	(31,025)	(14,919)
Gain on litigation settlement	(560)
Loss (gain) on sale of gold and silver bullion	223	(3,075)
Proceeds on sale of gold and silver bullion	1,467	23,836
Unrealized loss on silver bullion		359
Other-than-temporary impairment on marketable equity securities		1,993
Stock-based compensation	965	2,845
Accretion of asset retirement obligation	347	342
Depreciation	731	750
Amortization of mineral property interests and asset retirement obligations	1,244
Foreign exchange loss	819	156
Change in non-cash working capital items:
Increase in other assets related to operations	1,143	(6,680)
Dividend receivable obtained from acquisition of Minera Andes Inc.		9,363
Dividend receivable from Minera Santa Cruz S.A		2,611
Decrease in liabilities related to operations	(12,138)	(3,775)
Cash used in operating activities	$ (36,800)	$ (39,645)