SUBSEQUENT EVENTS (Details) (Rubicon Metals Corporation ("Rubicon"), CAD) In Millions, except Share data	Jun. 30, 2011
Rubicon Metals Corporation ("Rubicon")
Subsequent Event [Line Items]
Cash consideration made for a strategic investment	70
Cash consideration made for a strategic investment (in dollars per share)	3.23
Company's interest in acquired entity (in shares)	21,671,827

Balance held at close of period in number of shares.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 12C
-Paragraph Column B
-Article 12

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 12
-Paragraph Column B
-Article 12

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 14
-Paragraph Column B
-Article 12

Name:	us-gaap_InvestmentOwnedBalanceShares
Namespace Prefix:	us-gaap
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant