The Combination Process for Working Silicious and Semi-Base Ores Containing Gold and Silver. Not a "new process," but a better method than is generally employed for extracting the precious and base metals from silicious ores containing gold and silver associated with the baser metals. Pamphlet

[Mining] Trent, L.C.

Published by Fraser & Chalmers, Chicago, 1892
Condition: Used Soft cover

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