File:The Pacific tourist - Adams and Bishop's illustrated trans-continental guide of travel, from the Atlantic to the Pacific Ocean - a complete traveler's guide of the Union and Central Pacific railroads (14574931087).jpg

Identifier: pacifictouristad00will (find matches)
Title: The Pacific tourist : Adams & Bishop's illustrated trans-continental guide of travel, from the Atlantic to the Pacific Ocean ... : a complete traveler's guide of the Union and Central Pacific railroads ...
Year: 1881 (1880s)
Authors: Williams, Henry T Miller, Joaquin, 1837-1913. Great Plains and desert. 1881
Subjects: Union Pacific Railroad Company Central Pacific Railroad
Publisher: New York : Adams & Bishop
Contributing Library: Harold B. Lee Library
Digitizing Sponsor: Brigham Young University

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seven-tenths are gold, its color begins toshow. The valuable product obtained from the orewas over seventy-two per cent, of its assay valueduring the month reported above. It is notusual to obtain a better result than this withoutroasting the ore before amalgamation. It willinterest one, not familiar with mining, to noticehow small in both bulk and weight the bullionproduct is when compared with the amount ofore handled. During the month referred to, fourhundred and forty-six tons of ore, which wouldmake a mass 10 feet high, 20 feet wide and 30feet long, yielded only one ton of bullion, whichcould be melted into a solid cube 18 3-5 incheson a side, or 1,560 cubic feet of ore were workedto obtain one cubic foot of bullion. Reduction of the Ores,—The ores at thisplace are w^orked without roasting by the panprocess of American origin, first adopted on theComstock Lode. It is suited admirably to oreswhich work kindly, requiring little chemicalaction or heat to make them part with their
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precious contents, to be taken up by anialgauia-tion with quicksilver. Though it rarely yieldsas close a result as the JVlexican patio process,or the furnace and barrel process of Fi-eibei-g,it is so much more expeditious and economicalof labor, and so capable of being applied on alarge scale, that, on the whole, it is unquestion-ably preferable. The other processes referred tohave been thoroughly tried in Virginia City, andfound uttarly unsuited to the conditions existingthere. The first part of the process, is wet crushing ofthe ore, by stamps in iron mortars, a constantstream of water carrying oif through a brasswire screen the pulverized portion as fast as re-duced small enough. The screens are at theback of the mortar. Five stamps, weighingabout 650 pounds each, are usually placed in asingle mortar, and are lifted and dropped fromfive to eight inches about ninety times a minute.The feedar, standing in front, judges by thesound when and where to feed in the ore lyingbehind him. He

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