LEASES - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Lessee, Lease, Description [Line Items]
Right-of-use lease asset	$ 192		$ 226
Lease liability	200		235
Current portion of lease liabilities	$ 152		152
Lease term using a discount rate	9.50%
Lease expense:
Operating lease cost	$ 38	$ 38
Supplemental cash flow information related to leases:
Cash flows from operating leases	39	39
Operating leases	192	$ 322
Supplemental balance sheet information related to leases:
Operating lease right-of-use assets	192		226
Current portion of lease liabilities	152		152
Operating lease liabilities - long term portion	48		83
Total operating lease liabilities	$ 200		$ 235
Weighted Average Remaining Lease Term (in years)	1 year 3 months 18 days	2 years 7 months 6 days
Discount Rate	9.50%	9.50%
Corporate office
Lessee, Lease, Description [Line Items]
Variable lease terms	Because these amounts are variable from year to year and not specifically set in the lease terms, they are not included in the measurement of the right-of-use asset and related lease liability, but rather expensed in the period incurred.
Lessee, Operating Lease, Existence of Option to Extend [true false]	true
Option to extend, renewal term	3 years
Supplemental balance sheet information related to leases:
Lessee, Operating Lease, Variable Lease Payment, Terms and Conditions	Because these amounts are variable from year to year and not specifically set in the lease terms, they are not included in the measurement of the right-of-use asset and related lease liability, but rather expensed in the period incurred.
Minimum | Corporate offices, storage space and equipment
Lessee, Lease, Description [Line Items]
Remaining lease term	6 months
Maximum | Corporate offices, storage space and equipment
Lessee, Lease, Description [Line Items]
Remaining lease term	1 year 3 months 18 days
Maximum | Land used in exploration and mining activities, office equipment, machinery, office space, storage and other
Lessee, Lease, Description [Line Items]
Term of contract	1 year