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Many of the earliest books, particularly those dating back to 1900s and before, are now extremely scarce and increasingly expensive. We are republishing these classic works in affordable, high quality, modern editions, using the original artwork and text.
Reseña del editor
HINTS ON AMALGAMATION AND THE GENERAL CARE OF GOLD MILLS - 1899 - Introduction . . . . . . . . . . . . . 7 Page . Chapterz. 1-General Process . . . . . . . . . . 11 Arrangement of Mortars . . . . . . . 17 . . . . . . . Plates 21 I . . . . G Concentrators 30 G for Canvas Plant . . . . 34 . . . . . . . . U 2-Care of Quicksilver 35 Amalgamation . . . . . . . . . . 4 3 . . . . . . . . . . . a 3-Cleaning-up 60 . Retorting and Melting . . . . . . . 7 3 . . . . . . . . . . I. 6-Concentration 85 . . . . . . . . . . . . 6-Sampling 98 . . . . . . . . . . . I-Conclusioh 108 INTRODUCTION. Gold has been known from the earliest ages, from its occurrence In a metallic state in sedimentary deposits as well as in veins. On account of its great specific gravity, it can be collected from placers and river beds, by separation with water alone, and in veins after the matrix is crushed, a great amount is saved by the same simple method. When only rich deposits were exploited, anybody could manage as it apparently required only labor and opportunity, while as long as money was made, the losses that occurred did not trouble the owners. From this very simplicity of working, the majority of owners and investors imagined that no special training was requisite to insure success, but that any trustworthy man, skilled in mercantile pursuits, was the proper person for the place of general manager. To-day the same opinion is held by very many, in spite of the warnings from hosts of disastrous failures. One cause for this belief has been the lack of literature for this special branch of metallurgy in fact, very near 1890, there was practically no works written at all which spoke of gold except as a subsidlary product of the metallurgy of other metals. Volumes, both practical and scientific, have been published which deal with the special branches of the metallurgy of lead, copper, and silver, but the metallurgy of gold seemed so simple, it only required an occasional article in a paper or magazine. In spite of this dearth of written knowledge, practical men in all parts of the world were rapidly improving the methods of treatment, both mechanically and with the aid of chemistry, in their several localities but, through lack of exchange of thought, each section had a different process, on which faith was pinned to the exclusion of all other processes. As the rich deposits gave out, attention was turned to those of lower grade, which are now found to be very profitable with improved machinery and increased knowledge, but, even to-day, we are in the infancy of this science. The treatises on gold, now before the public, can still be counted on the fingers of one hand, and are either devoted to the scientific discussions of processes now in vogue, the history past and present of gold milling, or the mechanics pure and simple of the various machinery used. They are all good for the education of the world, but are lacking in definite directions of the best way to employ the methods they describe, and are generally understoqd by those only who have enjoyed a previous technical education. This absence of intelligent application of these known principles in the great rnajorlty of the mills in this State the home of gold milling, has been a constant source of wonder to me, and yet I have a fellow feeling from HINTS ON ABIALGAMATION...
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