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PLANT AND EQUIPMENT AND MINERAL PROPERTIES (Narrative) (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
May 19, 2022
USD ($)
mi
a
purchaseAgreement
Jun. 30, 2022
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2022
USD ($)
Jun. 30, 2021
USD ($)
Property, Plant and Equipment [Abstract]          
Depreciation expense   $ 870 $ 790 $ 1,679 $ 1,559
Purchase Agreement, acres to purchase | a 37,300        
Purchase Agreement, miles to purchase | mi 58.3        
Number of purchase agreements | purchaseAgreement 2        
Purchase Agreement, purchase price $ 27,500        
Purchase Agreement, deposit payment 5,500 5,500      
Purchase Agreement, payment due at closing $ 22,000        
Purchase Agreement, direct deal costs   $ 500   $ 500