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4. Sales of Products: Sales by significant product type (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Details        
Concentrate sales $ 2,180,232 $ 1,267,355 $ 3,690,351 $ 2,668,188
Dore sales 0 57,143 76,508 57,143
Total $ 2,180,232 $ 1,324,498 $ 3,766,859 $ 2,725,331