Field Testing for Gold and Silver —— A Practical Manual for Prospectors and Miners

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ISBN: 9781334327070 出版年：2016 页码：179 William Hamilton Merritt Forgotten Books

The more I worked with prospectors the more convinced I became that the usual blow-pipe sets prepared for colleges, etc., were much too complicated and too expensive for the field, and that a simpler and cheaper set of apparatus was desirable. How this want may be met I have endeavoured to show in the following pages. I do not claim, nor could I claim, any originality for the pan-amalgamation process, but by introducing a cheap and effective little balance, the procedure.