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3. Sales of Products: Schedule of sales by significant product type (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Details        
Concentrate sales $ 456,553 $ 1,262,690 $ 1,280,582 $ 1,952,008
Dore sales 33,002   310,364  
Total revenue 489,555 1,262,690 1,590,946 1,952,008
Total $ 489,555 $ 1,262,690 $ 1,590,946 $ 1,952,008