Report of the State Mineralogist . two Exeli coarse-ore furnaces of 12 tons capacity each; two Scottfurnaces for granzita (medium ore) of 36 tons and 18 tons capacity,respectively; and two Scott furnaces for tierras (fine ore) of 36 tonsand 24 tons capacity. In the latter part of 1917, these were all torndown, except the Exelis, and treated for their absorbed soil and gravel under the site of the old intermittent furnaces and 218 MINES AND MINERAL RESOURCES. of the Seotts was excavated to bedrock, a depth of 30 feet, and runthrough a washing plant for recovery of the
Report of the State Mineralogist . two Exeli coarse-ore furnaces of 12 tons capacity each; two Scottfurnaces for granzita (medium ore) of 36 tons and 18 tons capacity,respectively; and two Scott furnaces for tierras (fine ore) of 36 tonsand 24 tons capacity. In the latter part of 1917, these were all torndown, except the Exelis, and treated for their absorbed soil and gravel under the site of the old intermittent furnaces and 218 MINES AND MINERAL RESOURCES. of the Seotts was excavated to bedrock, a depth of 30 feet, and runthrough a washing plant for recovery of the metallic quicksilver con-tained. An important yield of metal was obtained from this the Senator mine, in 1917, a Herreschoff multiple-hearth furnace,mechanically rabbled, was handling the ore. (See Photo No. 21.) Itwas installed early in 1916, by the then manager, W. H. Landers, whoalso, in connection with this installation, patented certain features ofthe condenser system. This furnace is 14 feet inside diameter and. Photo No. 21. Herreschoff Multiple-hearth Furnace at Senator Mine of NewAlmaden Company, Santa Clara County. Photo by W. W. Bradley. has 6 hearths, plus a drying floor on the top (see Photo No. 22). Thereare two fire-boxes on #5 hearth (next to bottom) level, set opposite toeach other. On #2 hearth level, about one-third of the way aroundfrom the top exit-pipe, a third fire-box has been added in order to keepthe temperature of the gases above 600° F. while going through theCottrell dust precipitator which follows. The central column and therabble arms are air-cooled, the resulting hot air being utilized for con-centrate drying and other purposes. A Brown recording pyrometer SANTA CLARA COUNTY. 219 is connected in at the furnace exit to enable regulation of the fumetemperature. This furnace is stated not to work economically on material coarserthan J inch. Up to 58 tons have been treated in 24 hours; but it seemsto do its best work at between 40 and 5
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectminesandmineralresou
