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DESCRIPTION OF THE COMPANY (Details) | 12 Months Ended
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Dec. 31, 2012 acre lb item
DESCRIPTION OF THE COMPANY |
Uranium produced by in-situ recovery (ISR) methods since incorporation (in pounds) | 8,000,000
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

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- Definition Represents the mineral holdings of the entity. + References No definition available. + Details
Name: | urre_AreaOfMineralHoldings
Namespace Prefix: | urre_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the in-place mineralized metal material held by the entity. + References No definition available. + Details
Name: | urre_InPlaceMineralizedMetalMaterial
Namespace Prefix: | urre_
Data Type: | num:massItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the quantity of metal produced using in-situ recovery (ISR) methods by the entity since incorporation. + References No definition available. + Details
Name: | urre_MineralProductionByInSituRecoveryMethodsSinceIncorporation
Namespace Prefix: | urre_
Data Type: | num:massItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the NRC license to produce metal held by the entity. + References No definition available. + Details
Name: | urre_NRCLicenseToProduceMetal
Namespace Prefix: | urre_
Data Type: | num:massItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of licensed processing facilities held by the entity during the reporting period. + References No definition available. + Details
Name: | urre_NumberOfLicensedProcessingFacilities
Namespace Prefix: | urre_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the number of properties which are currently in production. + References No definition available. + Details
Name: | urre_NumberOfPropertiesCurrentlyInProduction
Namespace Prefix: | urre_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the period over which properties were acquired by the entity. + References No definition available. + Details
Name: | urre_PeriodOverWhichPropertiesWereAcquired
Namespace Prefix: | urre_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration