Third English Edition. Thoroughly Revised and Greatly Enlarged. With additional details concerning the Siemens-Halske and other recent processes.

Contents.—The MacArthur Process.—Chemistry of the Process.—Laboratory Experiments.—Control Testing and Analysis of Solutions.—Appliances for Cyanide Extraction.—The Actual Extraction by Cyanide.—Application of the Process.—Leaching by Agitation.—Zinc Precipitation of Gold.—The Siemens-Halske Process.—Other Cyanide Processes.—Antidotes for Cyanide Poisoning.—Cyaniding in New Zealand.

"Mr. Park's book deserves to be ranked as amongst the best of existing treatises on this subject."—Mining Journal.

At Press. With Numerous Plates, Maps, and Illustrations.

CYANIDING GOLD & SILVER ORES.

A Practical Treatise on the Cyanide Process; its Application, Methods of Working, Design and Construction of Plant, and Costs.

By H. FORBES JULIAN,

Mining and Metallurgical Engineer; Specialist in Gold: Late Technical Adviser of the Deutsche Gold und Silber Scheide Anstalt, Frankfort-on-Maine.

And EDGAR SMART, A.M.I.C.E.,