دانلود کتاب The fire assay of gold, silver and lead in ores and metallurgical products

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First edition, MSP, San Francisco, 1907. - 88 p.
OCR scan 500 pdiThe book present a system of assaying, intended to cover determinations of the precious metals (silver and gold) and of lead, according to methods quite commonly recognized in the Rocky Mountain States as suited to ores and products containing the just-named metals.
In reading books on the subject, the beginner in assaying is embarrassed in deciding which one of the various prescribed charges he is to employ. It has, therefore, been the aim of the author in this book to carry through a single system, which, while not the only one, would at least be definite and clear to the learner.TABLE OF CONTENTS
Preface
The Fire Assay of Ores or Furnace and Mill Products Containing Gold, Silver, and Lead
Sampling and Preparation of the Ore for Assay
Care of the Assay Office
Apparatus
The Assay Furnace
Crucibles and Scorifiers
Assay Balances
Fluxes Used in Assaying
Ores
The Scorification Assay
Cupelling
Parting
The Crucible Assay
Roasting of Ores
Assay of Matte
High-Grade Silver-Sulphide Assay
Assay o f Cyanide Solutions
Assay of Base-Bullion
Assay of Silver Bars or Ingots
Assay of Blister or Pig-Copper Containing Silver and Gold
Assay of Gold Bullion
Assay of Ores Containing Metallics
The Lead Assay