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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, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Details        
Concentrate sales $ 1,476,395 $ 1,788,031 $ 4,144,583 $ 4,390,686
Dore sales 79,675 64,605 136,818 154,278
Total $ 1,556,070 $ 1,852,636 $ 4,281,401 $ 4,544,964