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THE HYDRO-METALLURGY OF COPPER

By the same Autbor.

THE METALLURGY OF GOLD: A Practical Treatise on the Metallurgical Treatment of Gold-bearing Ores. Including the Assaying, Melting, and Refining of Gold. Fifth Edition, Enlarged and Re-arranged. With over 300 Illustrations and Numerous Folding Plates. Medium 8vo, cloth,

21s. net.

"The work is a storehouse of information and valuable data, and we strongly recommend it to all professional men engaged in the gold-mining industry."-Mining Journal.

THE CYANIDE PROCESS OF GOLD EXTRACTION: Including its Practical Application on the Witwatersrand Gold Fields in South Africa. With Diagrams and Working Drawings. Second Edition, Revised and Enlarged. Crown 8vo, cloth, 7s. 6d.

"The work will prove invaluable to all interested in gold mining, whether metallurgists or as investors."-Chemical News.

"This book is just what was needed to acquaint mining men with the actual working of a process which is not only the most popular, but is, as a general rule, the most successful for the extraction of gold from tailings."Mining Journal.

THE METALLURGY OF SILVER: A Practical Treatise on the Amalgamation, Roasting, and Lixiviation of Silver Ores. Including the Assaying, Melting, and Refining of Silver Bullion. Third Edition. Crown 8vo, cloth, Ios. 6d. "From first to last the book is thoroughly sound and reliable."-Colliery Guardian. "For chemists, practical miners, assayers, and investors alike, we do not know of any work on the subject so handy and yet so comprehensive.”— Glasgow Herald.

THE METALLURGY of ARGENTIFEROUS

LEAD: A Practical Treatise on the Smelting of Silver-Lead Ores and the Refining of Lead Bullion. Including Reports on various Smelting Establishments and Descriptions of Modern Smelting Furnaces and Plants in Europe and America. Crown 8vo, 400 pp., with 183 Illustrations, cloth, 12s. 6d.

"The numerous metallurgical processes, which are fully and extensively treated of, embrace all the stages experienced in the passage of the lead from the various natural states to its issue from the refinery as an article of commerce."-Practical Engineer.

LONDON: CROSBY LOCKWOOD & SON,

AND OF ALL BOOKSELLERS.

OF

COPPER

Palers

1904

BEING

AN ACCOUNT OF PROCESSES ADOPTED IN
THE HYDRO-METALLURGICAL TREATMENT
OF CUPRIFEROUS ORES, INCLUDING THE
MANUFACTURE OF COPPER VITRIOL

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WITH

CHAPTERS ON THE SOURCES OF SUPPLY OF COPPER

AND THE ROASTING OF COPPER ORES

BY

M. EISSLER, M.E.

MEMBER OF THE INSTITUTE OF MINING AND METALLURGY

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AUTHOR OF "THE METALLURGY OF GOLD,' THE METALLURGY OF SILVER
"THE METALLURGY OF ARGENTIFEROUS LEAD

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ETC. ETC.

Capio Yumen

LONDON

CROSBY LOCKWOOD AND SON

NEW YORK

D. VAN NOSTRAND COMPANY

23 MURRAY AND 27 WARREN STREETS

[All rights reserved]

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PREFACE.

A

LONG period has elapsed-to be measured by centuriessince the Hydro-Metallurgical Treatment of Copper Ores was originated at the Rio Tinto Mines. Several processes have since been evolved, as the result, in large measure, of the investigations of manufacturers of sulphuric acid, who employ iron sulphides containing a low percentage of copper for the production of the acid, and who made it a special study to extract the residual copper from the burnt pyrites and cinders. The successful solution of that problem led to the adaptation of various leaching processes at a few low-grade copper mines, where smelting operations would have been too costly for the profitable treatment of the ores.

The application of the various lixiviation processes has had only a limited scope up till now; but it is more than likely that in future more attention will be given to them, owing to the necessity which (it may be expected) will arise for an economical exploitation of the low-grade copper deposits occurring in various parts of the globe. These can be made to pay by leaching-which, when judiciously applied, is cheaper than smelting-and in view of the increasing consumption of copper many of these hitherto undeveloped sources of supply will no doubt be opened up and utilised.

In the present volume, no claim is made to originality, the descriptions given of various processes now in operation

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