Summary of Significant Accounting Policies (Narrative) (Details) (USD $)	3 Months Ended			6 Months Ended	9 Months Ended	12 Months Ended			154 Months Ended	157 Months Ended	160 Months Ended	163 Months Ended
	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Jun. 30, 2012	Sep. 30, 2012	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Mar. 31, 2012	Jun. 30, 2012	Sep. 30, 2012	Dec. 31, 2012
Mineral property expenditures	$ 4,481,607	$ 7,269,922	$ 6,365,807	$ 13,635,729	$ 18,117,336	$ 22,801,376	$ 12,259,691	$ 6,661,909	$ 69,242,426	$ 76,512,347	$ 80,993,954	$ 85,677,992
Restoration and reclamation obligations						1,071,843	339,564					1,071,843
Asset Retirement Obligation, Current						39,000	50,160					39,000
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount						11,225,880	9,751,180	12,960,600
Nichols Ranch ISR Uranium Project [Member]
Mineral property expenditures						$ 21,280,188	$ 9,754,067	$ 0
Arkose [Member]
Subsidiary or Equity Method Investee, Cumulative Percentage Ownership after All Transactions						81.00%