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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)
12 Months Ended
Dec. 31, 2021
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
Storage tanks15 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, 2021December 31, 2020
CostAccumulated
Depreciation
Net Book ValueCostAccumulated
Depreciation
Net Book
Value
Property, plant and equipment
Nichols Ranch$29,210 $(18,185)$11,025 $29,210 $(16,150)$13,060 
Alta Mesa13,626 (4,996)8,630 13,626 (4,088)9,538 
Equipment and other15,079 (12,751)2,328 13,528 (12,505)1,023 
Property, plant and equipment total$57,915 $(35,932)$21,983 $56,364 $(32,743)$23,621