CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Cash flows from operating activities:
Net loss	$ (15,624,373)	$ (11,199,397)	$ (10,354,567)
Reconciliation of net loss to cash used in operations-
Accretion/amortization of restoration reserve	85,181	121,183	155,943
Depreciation and depletion	556,993	727,245	899,738
Writedown of uranium properties and exploration expenses	1,737,359	1,460,170	961,278
Decrease in restoration and reclamation accrual	(1,767,289)	(1,530,303)	(1,373,228)
Stock compensation expense	427,292	883,941	1,032,308
Other non-cash items, net	73,932	2,289	19,700
Effect of changes in operating working capital items-
(Increase) decrease in receivables	(148,465)	(77,092)	17,646
(Increase) decrease in prepaid and other current assets	(88,578)	13,722	(53,831)
Increase (decrease) in payables and accrued liabilities and deferred credits	(116,223)	(802,560)	1,334,939
Net cash used in operating activities	(14,864,171)	(10,400,802)	(7,360,074)
Cash flows from investing activities:
(Increase) decrease in certificate of deposit, restricted	161,834	(2,042,428)	(551,366)
Additions to property, plant and equipment-
Proceeds from Joint Venture agreement		300,000
Acquisition of Neutron Energy, Inc.	(3,677,133)
Net cash used in investing activities	(8,530,524)	(2,364,723)	(2,365,903)
Cash flows from financing activities:
Proceeds from note payable	5,000,000
Payments of borrowings	(95,664)	(83,539)	(117,710)
Issuance of common stock, net	20,264,692	352,855	19,138,091
Net cash provided by financing activities	25,169,028	269,316	19,020,381
Net increase (decrease) in cash and cash equivalents	1,774,333	(12,496,209)	9,294,404
Cash and cash equivalents, beginning of year	2,890,263	15,386,472	6,092,068
Cash and cash equivalents, end of year	4,664,596	2,890,263	15,386,472
Kingsville Dome
Reconciliation of net loss to cash used in operations-
Writedown of uranium properties and exploration expenses	919,000	851,000	590,000
Additions to property, plant and equipment-
Additions to property, plant and equipment	(690,108)	(141,137)	(149,652)
Rosita
Reconciliation of net loss to cash used in operations-
Writedown of uranium properties and exploration expenses	139,000	126,000	58,000
Additions to property, plant and equipment-
Additions to property, plant and equipment	(68,454)	(125,693)	(58,504)
Vasquez
Reconciliation of net loss to cash used in operations-
Writedown of uranium properties and exploration expenses	679,000	483,000	313,000
Additions to property, plant and equipment-
Additions to property, plant and equipment	(101,874)	(97,200)	(77,500)
Rosita South
Additions to property, plant and equipment-
Additions to property, plant and equipment	(9,447)	(40,959)	(78,813)
Los Finados/Tecolote project
Additions to property, plant and equipment-
Additions to property, plant and equipment	(5,950)	(88,236)	(1,168,780)
Churchrock
Additions to property, plant and equipment-
Additions to property, plant and equipment	(2,770,833)	(58,838)	(138,541)
Crownpoint/Section 13 Drilling
Additions to property, plant and equipment-
Additions to property, plant and equipment	(283,625)	(34,921)	(119,624)
Other property
Additions to property, plant and equipment-
Additions to property, plant and equipment	(519,690)	(35,311)	(23,123)
Juan Tefoya
Additions to property, plant and equipment-
Additions to property, plant and equipment	$ (565,244)