Ur-Energy Inc. Quarterly report pursuant to Section 13 or 15(d)

Capital Assets (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Cost	$ 39,100us-gaap_PropertyPlantAndEquipmentGross	$ 39,076us-gaap_PropertyPlantAndEquipmentGross
Accumulated Depreciation	6,649	6,083
Net Book Value	32,451us-gaap_PropertyPlantAndEquipmentNet	32,993us-gaap_PropertyPlantAndEquipmentNet
Rolling stock [Member]
Property, Plant and Equipment [Line Items]
Cost	3,881	3,878
Accumulated Depreciation	2,946	2,852
Net Book Value	935	1,026
Building Enclosures [Member]
Property, Plant and Equipment [Line Items]
Cost	32,987	32,968
Accumulated Depreciation	2,340	1,927
Net Book Value	30,647	31,041
Machinery and equipment [Member]
Property, Plant and Equipment [Line Items]
Cost	992	992
Accumulated Depreciation	446	426
Net Book Value	546	566
Furniture, fixtures and leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Cost	119	119
Accumulated Depreciation	84	81
Net Book Value	35	38
Information technology [Member]
Property, Plant and Equipment [Line Items]
Cost	1,121	1,119
Accumulated Depreciation	833	797
Net Book Value	$ 288	$ 322