Amount of cash paid to acquire the entity.

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141R

-Paragraph 68

-Subparagraph f(1)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141

-Paragraph 51

-Subparagraph d

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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_BusinessAcquisitionCostOfAcquiredEntityCashPaid
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Subsequent Events (Details) (Subsequent Event [Member]) In Millions, except Share data, unless otherwise specified			0 Months Ended
	Mar. 31, 2013 Endeavor Silver Stream [Member] USD ($)	Mar. 31, 2013 Cerro Bayo Royalty [Member] USD ($)	Apr. 16, 2013 Orko Silver Corporation [Member] CAD	Apr. 11, 2013 Maximum [Member] Endeavor Silver Stream and Cerro Bayo Royalty [Member] USD ($)
Subsequent Event [Line Items]
Cost of acquired entity, cash paid			100
Business acquisition, equity interest issued or issuable, number of shares			11,572,918
Business acquisition, warrants issued			1,588,768
Disposal group, potential consideration transferred				67
Mining property, at carrying value	28.6
Royalty asset, at carrying value		$ 6.1