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REVENUE AND COST OF SALES (Tables)
 12 Months Ended
Dec. 31, 2019
Revenue And Cost Of Sales  
Schedule of Revenue

    2019     2018     2017  
Concentrate sales   $ 31,417     $ 34,551     $ 33,327  
Provisional pricing adjustments     329       (435 )     32  
    $ 31,746     $ 34,116     $ 33,359  
Schedule of Cost of Sales

    2019     2018     2017  
Production costs   $ 27,949     $ 24,619     $ 19,418  
Inventory net realizable adjustment     387       -       -  
Depreciation and depletion     3,680       3,231       2,688  
    $ 32,016     $ 27,850     $ 22,106