. Appendix to the Journals of the Senate and Assembly of the ... session of the Legislature of the State of California. diameter by 18 feet high, having conical bottoms with 60° cone. Theoverflow from tables elevated to two conical classifiers, size 42-inchdiameter by 9 feet high. Underflow from classifiers to waste sluiceand overflow to two Darrow rotary slime tables. Concentrates go tosump joining concentrates from other tables and pumped to fourPachuca tanks, where air agitation and decantation method used incyanide treatment. Tailings from mill run about 60 cents per men are empl
. Appendix to the Journals of the Senate and Assembly of the ... session of the Legislature of the State of California. diameter by 18 feet high, having conical bottoms with 60° cone. Theoverflow from tables elevated to two conical classifiers, size 42-inchdiameter by 9 feet high. Underflow from classifiers to waste sluiceand overflow to two Darrow rotary slime tables. Concentrates go tosump joining concentrates from other tables and pumped to fourPachuca tanks, where air agitation and decantation method used incyanide treatment. Tailings from mill run about 60 cents per men are employed. 24 MINES AND MINERAL RESOURCES. Central Eureka {Summit) Mine (quartz). See our Reports X, p. 104;XI, p. 144; XII, p. 79; XIII, p. 69; Bulletin 18, p. 18. This propertyjoins the South Eureka on the north, J mile south of the town of SutterCreek. Workings are carried on through a three compartment shaft15xl0 in the clear 3170 feet deep, sunk on 57° incline. Three parallelveins have been developed. Shaft cuts contact or hanging-wall vein onthe 500-foot level, and is sunk on vein to 2000-foot level. From 1800-. View of Sutter Creek from the Central Eureka Mine. foot to 3100-foot level new shaft was sunk in footwall. On 3000-footlevel shaft cuts west vein, the east vein lying 20 feet east, while contactor hanging-wall vein lies 200 feet east of the first named. The veinsare in the form of stringer leads with black slate gouge on of veins N. 20° W., dip 55° to 70° E., with an average width ofsix feet. Two series of ore shoots have been developed, north seriesbeing 60 feet in length, and south shoots 200 feet long. East and westveins have slate walls, while hanging-wall vein has a slate footwall andgreenstone hanging-wall. In crosscutting the slates thin lenses ofmetadiabase are cut. Present work is being carried on the 2800, 3000,3100 levels, where some very good grade ore has been developed uponthe east and west veins. Ore is hoisted in 2-ton skips by 16x2
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Keywords: ., bookauthorcaliforn, bookcentury1800, bookdecade1850, bookyear1853
