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14. Forward Gold Contracts: Change in balance forward gold contracts (Details)
 12 Months Ended
Dec. 31, 2018
USD ($)
Details  
Change in balance for the forward gold contracts beginning $ 920,579
Change in balance for the forward gold contracts conversion (492,784)
Change in balance for the forward gold contracts cash payments (185,798)
Change in balance for the forward gold contracts gold purchased (257,981)
Change in balance for the forward gold contracts, change in fair value 15,984
Change in balance for the forward gold contracts ending $ 0