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14. Forward Gold Contracts: Change in balance forward gold contracts (Details) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Details    
Change in balance for the forward gold contracts beginning $ 1,386,228  
Change in balance for the forward gold contracts proceeds   $ 1,240,306
Change in balance for the forward gold contracts cash payments (357,766) (60,626)
Change in balance for the forward gold contracts gold purchased 920,579 1,386,228
Change in balance for the forward gold contracts current portion $ 351,970 $ 541,030