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4. Sales of Products: Schedule of sales by significant product type (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Details        
Concentrate sales $ 1,788,031 $ 1,032,845 $ 4,390,686 $ 2,313,428
Dore sales 64,605 0 154,278 310,364
Total $ 1,852,636 $ 1,032,845 $ 4,544,964 $ 2,623,792