LEASES - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Option to Terminate	however, the renewal option and any option to terminate is not reasonably certain
Operating lease right-of-use assets	$ 336	$ 87
Lease liability	337
Operating lease liability, current	$ 117	$ 91
Lease not yet commenced, Term	5 years
Net present value of lease not yet commenced	$ 1,100
Total lease payments	$ 385
Corporate office
Lessee, Lease, Description [Line Items]
Lease extension term	3 years
Lessee, Operating Lease, Existence of Option to Extend [true false]	true
Option to extend, renewal term	3 years
Lessee, Operating Lease, Assumptions and Judgments, Allocation of Lease and Nonlease Component	Because these amounts are related to common area maintenance of the leased space, they are considered a non-lease component and are not included in the measurement of the right-of-use asset and related lease liability, but rather expensed in the period incurred.
Corporate office | Centennial, Colorado
Lessee, Lease, Description [Line Items]
Total lease payments	$ 300
Minimum
Lessee, Lease, Description [Line Items]
Lease term using a discount rate	3.00%
Maximum
Lessee, Lease, Description [Line Items]
Lease term using a discount rate	12.00%
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