The Mother Lode region of California . s is about 5 tons per stamp daily (by car measurement). Thistonnage is probably due to the peculiar character of the ore, which con-sists of a considerable quantity of chloritic schist and calcite, and sharpgrains of quartz, which pulverize readily, the stamp cutting the softermaterial rapidly. The gold is mostly caught inside the battery. Theapron plates are 24 by 48 inches; the sluice plates are divided and are20 inches by 20 feet. No traps of any kind are in use. There are 20Frue vanners—twelve 4-foot and eight 6-foot machines. The ore con-tains about
The Mother Lode region of California . s is about 5 tons per stamp daily (by car measurement). Thistonnage is probably due to the peculiar character of the ore, which con-sists of a considerable quantity of chloritic schist and calcite, and sharpgrains of quartz, which pulverize readily, the stamp cutting the softermaterial rapidly. The gold is mostly caught inside the battery. Theapron plates are 24 by 48 inches; the sluice plates are divided and are20 inches by 20 feet. No traps of any kind are in use. There are 20Frue vanners—twelve 4-foot and eight 6-foot machines. The ore con-tains about 2 per cent of pyrite. The pulp from the batteries is divided, 110 CALIFORNIA STATE MINING BURP:AU. hut not sized, before going to the vanners. The speed of the concen-trating machines is controlled by means of a cone pulley. An experi-ment was made on a lower discharge (at 7-| inches), which resulted inscouring of the inside plates. This was discontinued for the higher PocKEtT in /^ILL c>CREE:N LiGHTNE-R Mill, Angels, P = Pocke-t: W. Iron WcA^cs. Fig. 32. discharges now in use. Chrome shoes and white iron dies are in use inthis mill. The latter last five months, crushing 750 tons of ore. Theconcentrates at this mill are worked by chlorination at the Utica ingenious screen has been invented by Mr. Reaves, which is illus-trated in the accompanying sketch (Fig, 32).The screen is fitted with two pockets at thefront, and these may be opened at will, andchips or other foreign matter removed byinserting the hand. The method of securingthe screen to the frame is shown in the illus-tration. (Fig. 33 is anChuck Block illustration of the Lightner, .. chuck-block, with iron rods to protect the plate lrbr-\l^ods. scouring.) Utica-SticJde Mine.—It isat Angels. Since the last report, a verticalshaft has been sunk to a depth of 1370 shaft is located south and east of the oldshafts, and is in the hanging-wall schists. Itis substantially timbered t
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectminesandmineralresou
