File:Report of the State Mineralogist (1892) (14782308832).jpg

Identifier: reportofstatemin17cali (find matches)
Title: Report of the State Mineralogist
Year: 1892 (1890s)
Authors: California State Mining Bureau
Subjects: Mines and mineral resources Gold mines and mining Mineralogy
Publisher: Sacramento : California State Mining Bureau
Contributing Library: University of California, Davis Libraries
Digitizing Sponsor: University of California, Davis Libraries

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operation on copper ores for more than twoyears without such repairs. It is stated that an 82% recovery of theassay value of the feed was obtained with the Herreschoff furnace for SANTA CLARA COUNTY. 221 the 4 months ending with July, 1917.. The heads assayed approximately0.9% mercury, and contained from 3 to 5 tons, daily, of concentratesassaying up to 4%, which were mixed with the mine-run ore. As the furnace does not work economically on material coarser thanf, the ore after preliminary breaking in a gyratory crusher, is passedover a shaking screen of f mesh, and the oversize re-crushed in a jawbreaker. A bucket elevator is included in the equipment, and electricpower is used. The first condenser consists of 20 iron pipes 12 diam. x12 long, an arrangement patented by Landers1 in 1916, then managerof the New Alamaden Company. Condensers $2, jf3, and #4 areredwood-stave tanks, 12 diam. x 16 high. No. 2 can be seen at theright of the photograph. These tanks are cleaned out one a week.
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Photo No. 24. New 90-ton Scott furnace at Senator Mine of New Alamaden Company.Photo by W. W. Bradley. A 90-ton double Scott fine-ore furnace was built in the early part of 1918. Ithas 4 fireboxes and handles a minimum of 75 tons per day, though it has treated upto 96 tons per 24 hours. It is thus the largest Scott furnace at present in operation.The ore is crushed to pass a 2-inch ring; and is transported from the crusher bins, byan inclined belt-conveyor, discharging directly into the top of the furnace. The sidewalls of the furnace are built up several feet above the level of the throat, thusgiving an auxiliary ore-bin and providing an automatic furnace-feed. There are eight new condensing chambers connected with this furnace, arranged ina double row. The first chamber in each row is of concrete, and the other three areof tongue and groove redwood, built rectangular. A 3-foot redwood-stave flue con-nects the last of this series of condensers to the first circular wooden condenser o

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