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PROPERTY AND EQUIPMENT (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
PROPERTY AND EQUIPMENT |  |  |
Subtotal | $ 22,122 us-gaap_PropertyPlantAndEquipmentGross | $ 18,443 us-gaap_PropertyPlantAndEquipmentGross |
Less: accumulated depreciation | (4,226)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment | (3,300)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment |
Total | 17,896 us-gaap_PropertyPlantAndEquipmentNet | 15,143 us-gaap_PropertyPlantAndEquipmentNet |
Depreciation expense | 979 us-gaap_DepreciationDepletionAndAmortization | 942 us-gaap_DepreciationDepletionAndAmortization | 1,033 us-gaap_DepreciationDepletionAndAmortization
Trucks and trailers |  |  |
PROPERTY AND EQUIPMENT |  |  |
Subtotal | 1,012 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_TrucksMember | 1,041 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_TrucksMember |
Office furniture and equipment |  |  |
PROPERTY AND EQUIPMENT |  |  |
Subtotal | 1,404 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_FurnitureAndFixturesMember | 1,163 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_FurnitureAndFixturesMember |
Leasehold Improvements |  |  |
PROPERTY AND EQUIPMENT |  |  |
Subtotal | 661 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LeaseholdImprovementsMember |  |
Drill rigs |  |  |
PROPERTY AND EQUIPMENT |  |  |
Subtotal | 998 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_WellsAndRelatedEquipmentAndFacilitiesMember | 998 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_WellsAndRelatedEquipmentAndFacilitiesMember |
Building |  |  |
PROPERTY AND EQUIPMENT |  |  |
Subtotal | 1,514 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_BuildingMember | 1,469 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_BuildingMember |
Land |  |  |
PROPERTY AND EQUIPMENT |  |  |
Subtotal | 8,699 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LandMember | 8,672 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LandMember |
Mining equipment |  |  |
PROPERTY AND EQUIPMENT |  |  |
Subtotal | 1,548 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ExplorationAndProductionEquipmentMember | 1,206 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ExplorationAndProductionEquipmentMember |
Construction in process |  |  |
PROPERTY AND EQUIPMENT |  |  |
Subtotal | $ 6,286 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ConstructionInProgressMember | $ 3,894 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ConstructionInProgressMember |

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- Definition Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.14) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 14 -Article 5 + Details
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