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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)
 12 Months Ended
Dec. 31, 2019
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
15 years
•
Shop tools and equipment
3-5 years
•
Mining equipment
5 years
•
Office equipment
4-5 years
•
Furniture and fixtures
5-7 years
•
Light trucks and utility vehicles
5 years
The following is a summary of plant and equipment:
 
December 31, 2019
 
December 31, 2018
 
Cost
 
Accumulated
Depreciation
 
Net Book Value
 
Cost
 
Accumulated
Depreciation
 
Net Book
Value
Property, plant and equipment
 
 
 
 
 
 
 
 
 
 
 
Nichols Ranch
$
29,210

 
$
(14,115
)
 
$
15,095

 
$
29,210

 
$
(12,021
)
 
$
17,189

Alta Mesa
13,626

 
(3,179
)
 
10,447

 
13,656

 
(2,319
)
 
11,337

Equipment and other
12,900

 
(12,239
)
 
661

 
13,444

 
(12,127
)
 
1,317

Property, plant and equipment total
$
55,736

 
$
(29,533
)
 
$
26,203

 
$
56,310

 
$
(26,467
)
 
$
29,843