Ebook: Fire assaying

First edition, McGraw-Hill Book Company, Inc., New York, 1940. - 279 p.The objectives of this book are to present the subject of fire assaying in such a manner as to serve the following needs: (1) as a self-study text of the practical art of assaying for individuals who may not have had a college course in chemistry; (2) as a text for technical institute students of assaying who do not intend to follow a complete academic curriculum in metallurgy; (3) as a reference for practicing assayers; and (4) as a college text for the student of metallurgy.
As a reference for practicing assayers, sufficient material is presented so that workable procedures can be evolved for the determination of gold and silver in almost any type of natural or artificial material. Complete schemes are given for the determination of the individual members of the platinum group in order to bring together many scattered references that are unlikely to be available except in the larger technical libraries. A brief resume of the fire assay of base metals is also given. At the suggestion of assayers in the field, a short chapter on the preparation of bullion from amalgam and cyanide precipitates is presented, as well as appendixes listing assay equipment, assay supplies, and the location of assay supply houses.Contents
Preface
The scope of fire assaying
Sampling
Weighing
Cupellation
Parting
Theoretical discussion of assay fusions and related smelting processes
The crucible assay
The scorification assay
The assay of bullion for gold and silver
The assay of materials requiring preliminary acid treatment
Assay for solutions for gold and silver
The fire assay for the platinum metals
Fire assay methods for base metals
The accuracy of the fire assay for gold and silver
The preparation of gold and silver bullion from amalgam and cyanide precipitate
Assay equipment and suppliers
Minimum equipment for a small assay office
List of assay suppliers and reagents
Assay supply houses
Index