CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	6 Months Ended
Jun. 30, 2012	Jun. 30, 2011
Cash flows (used in) from operating activities:
Cash paid to suppliers and employees	$ (42,781)	$ (22,372)
Interest received	125	31
Cash used in operating activities	(42,656)	(22,341)
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	(563)	(792)
Additions to property and equipment	(1,658)	(7,196)
Proceeds from disposal of property and equipment	53	23
Investment in gold and silver bullion		(31,299)
Proceeds from sale of gold and silver bullion	11,330	2,173
Increase in restricted investments securing reclamation		(413)
Cash provided by (used in) investing activities	49,432	(37,504)
Cash flows from financing activities:
Sale of common stock for cash, net of issuance costs		105,415
Exercise of stock options	3,304	773
Cash provided by financing activities	3,304	106,188
Effect of exchange rate change on cash and cash equivalents	(98)	190
Increase in cash and cash equivalents	9,982	46,533
Cash and cash equivalents, beginning of period	13,416	6,818
Cash and cash equivalents, end of period	23,398	53,351
Reconciliation of net loss to cash used in operating activities:
Net loss	(40,453)	(21,888)
Adjustments to reconcile net loss from operating activities:
Income on investment in Minera Santa Cruz S.A. (net of amortization)	(990)
Deferred income taxes	(8,550)
Gain on sale of gold and silver bullion	(1,842)	(524)
Unrealized loss on silver bullion	359
Other-than-temporary impairment on marketable equity securities	1,993
Gain on sale of assets	(130)	(10)
Asset impairments	179
Stock-based compensation	2,135	1,222
Accretion of asset retirement obligation	232	266
Depreciation	484	259
Foreign exchange loss (gain)	98	(190)
Change in non-cash working capital items:
Increase in other assets related to operations	(2,810)	(2,311)
Dividend receivable obtained from acquisition of Minera Andes Inc.	9,363
(Increase) decrease in liabilities related to operations	(2,724)	835
Cash used in operating activities	$ (42,656)	$ (22,341)

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of investments, not including unrealized gains or losses on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity, held at each balance sheet date and included in earnings for the period.

+ References

+ Details

Name:	us-gaap_UnrealizedGainLossOnInvestments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration