The quicksilver resources of California . charge is from 75 to 80 pounds of concentrates per shift, withthe necessary lime, against 150 pounds of raw ore. Two fur-nace men are required—one per shift. The expenses of this plant are about $25 per day for labor, 202 QUICKSILVER RESOURCES OF CALIFORNIA. fuel, repairs, etc. The lo-pipe retort, with suitable ore, canhandle the total product of the concentrating mill, running dayand night, concentrating from 20 to 24 tons. The total costof the plant, not including the mill building, is approximatel3: 25 H. P. engine $1, Rock-crusher 5-fo
The quicksilver resources of California . charge is from 75 to 80 pounds of concentrates per shift, withthe necessary lime, against 150 pounds of raw ore. Two fur-nace men are required—one per shift. The expenses of this plant are about $25 per day for labor, 202 QUICKSILVER RESOURCES OF CALIFORNIA. fuel, repairs, etc. The lo-pipe retort, with suitable ore, canhandle the total product of the concentrating mill, running dayand night, concentrating from 20 to 24 tons. The total costof the plant, not including the mill building, is approximatel3: 25 H. P. engine $1, Rock-crusher 5-foot Huntington mill 1, 5 bumping-tables 1, Concentrating table I elevator Fittings, pipes, etc Contingent expenses I pipe retort, with building and drier $5, 2, $7, j7, This plant in three months turned out 330 flasks of mercurj-;^ / / 1. i 4 Iron pipe from re/ort. Fig. 65. Condensing plant soot retort, Boston Mine. and since the visit of the writer, has continued to be operatedwith about the same results. This pipe retort furnace may be considered as an example ofthe best practice for such an installation • the condensing prac-tice is especially very well conceived. At the Boston mine (Knoxville), the soot is treated in aretort furnace using a condenser formed b} a wooden box,surrounded by water, which is constant!}^ renewed, the exitpipe from the condenser being partly immersed in the watercovering the top of the condensing box. [See Fig. 65.] Another arrangement of flues under the pipe retorts, bywhich the parts of the pipes nearest the front and back wallsreceive the greatest heat, has been patented by Messrs. Johnsonand McKay. [See Fig. 66.] The exit pipes of these furnacesare only 6 feet long, without any attempt at cooling; under METALLURGY. 203 their lower end runs a wooden trough wherein the mercury iscollected, and a loose burlap she
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