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REVENUE AND COST OF SALES (Tables)
 12 Months Ended
Dec. 31, 2018
Revenue And Cost Of Sales  
Schedule of Revenue
    2018      

2017

(Note 3)

      

2016

(Note 3)

  
                       
Concentrate sales   $ 34,551     $ 33,327     $ 34,925  
Provisional pricing adjustments     (435 )     32       (233 )
    $ 34,116     $ 33,359     $ 34,692  
Schedule of Cost of Sales

    2018      

2017

(Note 3)

      

2016

(Note 3)

  
                       
Production costs   $ 24,619     $ 19,418     $ 21,060  
Depreciation and depletion     3,231       2,688       1,901  
    $ 27,850     $ 22,106     $ 22,961