Report of the State Mineralogist . flotation cells, and then to 1double-deck Deister-Overstrom table. The table was not only crowded(120 tons per 24 hr.) but was compelled to handle an unclassified 12 diam. x 6 high, Dorr settler dewatered the concentrates, followed SANTA CLARA COUNTY. 223 by a 6 diam. x 4 Oliver filter. The concentrates were handled bymotor truck to the Herreschoff furnace. It is stated that the headssample averaged mercury; that the tailings could have beenbrought down to mercury by finer grinding; that the equipmentand practice could have been improved so
Report of the State Mineralogist . flotation cells, and then to 1double-deck Deister-Overstrom table. The table was not only crowded(120 tons per 24 hr.) but was compelled to handle an unclassified 12 diam. x 6 high, Dorr settler dewatered the concentrates, followed SANTA CLARA COUNTY. 223 by a 6 diam. x 4 Oliver filter. The concentrates were handled bymotor truck to the Herreschoff furnace. It is stated that the headssample averaged mercury; that the tailings could have beenbrought down to mercury by finer grinding; that the equipmentand practice could have been improved so that an extraction of over80% could have been obtained; but that it cost from $80-$85 per flask(including furnace reduction of the concentrates) to produce themetal, as against $45-$50 per flask by careful sorting and regulationof the ore feeding direct to the furnace. Fine grinding was the expen-sive part of the process. The ore being largely a hard and tough,silicified serpentine, the steel-liner and ball consumption was Photo No. 26. Gravel-washing plant for recovering metallic quicksilver from material exca-vated from old furnace sites, at Hacienda of New Almaden Company, Santa Clara by W. W. Bradley. There is no ochre in the ore, but considerable slime from the serpen-tine. Screen analyses showed cinnabar in the flotation tailings on the— 80 and — 100-mesh chats. The flotation plant at the Senator had 3 Callow cells and a Deister-Overstrom table; and at first used two 4 x 4 ball-mills. These latterwere replaced by a 4£ x 6 Marcy mill. The flotation concentratesproved to be messy stuff to handle, and not the easiest thing to dry forconvenient feeding to the furnace. According to R. S. Lewis1 othershave found the handling of flotation concentrates far from being anunalloyed pleasure. After passing through the flotation cell, thepulp passed directly to the tables without further classification or 1 Lewis, R. S., The disposal of flotation productspp.
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectminesandmineralresou
