Mill Works Virginia City Comstock Lode Nevada Mining 1870

This print is out of a very rare book, Report of the Geological Exploration of the Fortieth Parallel. Clarence King Geologist, Volume III, Mining Industry by James D. Hague. Government Printing Office 1870

General Arrangement of Mills. — The general arrangement of the machinery in a mill, working silver ores by the method described in the foregoing pages, may be illustrated by a drawing on Plate XX'III, which presents a sectional view of the building and the more important machines employed in it. The batteries of stamps, as many as there may be, are arranged in one straight line. Behind them, that is on the feed side, is the breaking floor where the rock is prepared by a stone-breaking machine, or, in its absence, by hand. When the slope of the ground permits it, large bins are sometimes constructed above and behind the breaker, into which receiver the wagons or cars bringing the ore from the mine may discharge their contents. As the outlet of the bins is on a higher level than the, mouth of the breaker, the rock is delivered to that machine without much handling. Such bins, where practicable, are of great advantage in providing a reserve of ore for the mill when-ever communication with the mine is interrupted for a time. The batteries ischarge the crushed ore upon an apron, or, as in the case illustrated, into a trough, or launder, which conveys it to the settling tanks. These stand directly in front of the batteries, though in some mills, for lack of space, they extend along the adjacent side of the building. A platform is usually provided upon which the pulp may be deposited when shoveled out of the tanks. Some mills are so arranged as to use a car, in which the pulp is moved from tlio tanks to the pans. This is especially necessary when the tanks are more remote from the pans, or when the latter are arranged in a line at a right angle to the line of the batteries. 

Size of sheet is overall length 18" X 11 1/2" wide

Condition: Crisp and clean. Once framed this map will be an excellent example of a historic print that is 150 years old.

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