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14. Forward Gold Contracts: Change in balance forward gold contracts (Details) - USD ($) | 12 Months Ended
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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

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