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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)
12 Months Ended
Dec. 31, 2020
Accounting Policies [Abstract]  
Schedule of Property, Plant and Equipment Useful Lives
Where straight-line depreciation is utilized, the range of useful lives for various asset classes is generally as follows:
Buildings
12 - 15 years
Shop tools and equipment
3 - 5 years
Mining equipment5 years
Office equipment
4 - 5 years
Furniture and fixtures
5 - 7 years
Light trucks and utility vehicles5 years
The following is a summary of property, plant and equipment:
December 31, 2020December 31, 2019
CostAccumulated
Depreciation
Net Book ValueCostAccumulated
Depreciation
Net Book
Value
Property, plant and equipment
Nichols Ranch$29,210 $(16,150)$13,060 $29,210 $(14,115)$15,095 
Alta Mesa13,626 (4,088)9,538 13,626 (3,179)10,447 
Equipment and other13,528 (12,505)1,023 12,900 (12,239)661 
Property, plant and equipment total$56,364 $(32,743)$23,621 $55,736 $(29,533)$26,203