Mineral Properties (Schedule Of Business Acquisitions By Acquisition) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended			9 Months Ended			9 Months Ended
Sep. 30, 2012	Sep. 30, 2012 Long Valley, United States [Member]	Dec. 31, 2011 Long Valley, United States [Member]	Sep. 30, 2012 Concordia, Mexico [Member]	Sep. 30, 2012 Guadalupe de los Reyes, Mexico [Member]	Dec. 31, 2011 Guadalupe de los Reyes, Mexico [Member]	Sep. 30, 2012 Awak Mas, Indonesia [Member]	Sep. 30, 2012 Mt. Todd, Australia [Member]	Dec. 31, 2011 Mt. Todd, Australia [Member]
Business Acquisition [Line Items]
Mineral properties net, Beginning balance	$ 16,517	$ 750	$ 750	$ 10,303	$ 2,752	$ 2,752	$ 566	$ 2,146	$ 2,146
Cost recovery	(2,566)			(2,000)			(566)
Mineral properties net, Ending balance	$ 13,951	$ 750	$ 750	$ 8,303	$ 2,752	$ 2,752		$ 2,146	$ 2,146

Mineral properties, net of adjustments.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 19

-Paragraph 15

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Name:	us-gaap_MineralPropertiesNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant