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4. Sales of Products: Schedule of sales of products by metal (Details) - USD ($)
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Details    
Gold sales $ 1,520,699 $ 1,241,539
Silver sales 3,896 2,510
Smelter and refining charges (123,761) (99,374)
Total $ 1,400,834 $ 1,144,675