DESCRIPTION OF BUSINESS (Details)	3 Months Ended
Mar. 31, 2013 lb item acre
DESCRIPTION OF BUSINESS
Number of licensed processing facilities	2
Uranium mineral holdings (in acres)	206,600
In-place mineralized uranium material (in pounds)	144,800,000
NRC license to produce uranium (in pounds)	3,000,000
Period over which properties were acquired	20 years
Number of properties currently in production	0

Represents the mineral holdings of the entity.

No definition available.

Name:	urre_AreaOfMineralHoldings
Namespace Prefix:	urre_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	duration

Represents the in-place mineralized metal material held by the entity.

No definition available.

Name:	urre_InPlaceMineralizedMetalMaterial
Namespace Prefix:	urre_
Data Type:	num:massItemType
Balance Type:	na
Period Type:	duration

Represents the NRC license to produce metal held by the entity.

No definition available.

Name:	urre_NRCLicenseToProduceMetal
Namespace Prefix:	urre_
Data Type:	num:massItemType
Balance Type:	na
Period Type:	duration

Represents the number of licensed processing facilities held by the entity during the reporting period.

No definition available.

Name:	urre_NumberOfLicensedProcessingFacilities
Namespace Prefix:	urre_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

Represents the number of properties which are currently in production.

No definition available.

Name:	urre_NumberOfPropertiesCurrentlyInProduction
Namespace Prefix:	urre_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

Represents the period over which properties were acquired by the entity.

No definition available.

Name:	urre_PeriodOverWhichPropertiesWereAcquired
Namespace Prefix:	urre_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Name:	us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration