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4. Sales of Products: Sales by significant product type (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Details        
Concentrate sales $ 1,845,547 $ 1,476,395 $ 5,535,899 $ 4,144,583
Dore sales 253,302 79,675 329,809 136,818
Total $ 2,098,849 $ 1,556,070 $ 5,865,708 $ 4,281,401