. Appendix to the Journals of the Senate and Assembly of the ... session of the Legislature of the State of California. one on the footwall side 100 feet long by 40 feet wide onwhich they have gone down 90 feet; and one on the hanging, 200 feetlong by 40 feet wide. The ledge has been proven underground bydrifting, for 1000 feet in length. The ore is cinnabar, intermixed withmore or less pyrite, and occurs in seams, sometimes an inch or twothick, of solid cinnabar. These seams are approximately parallel to theledge, and are crossed at high angles by other and rather minute ore 232 MINES AND MIN
. Appendix to the Journals of the Senate and Assembly of the ... session of the Legislature of the State of California. one on the footwall side 100 feet long by 40 feet wide onwhich they have gone down 90 feet; and one on the hanging, 200 feetlong by 40 feet wide. The ledge has been proven underground bydrifting, for 1000 feet in length. The ore is cinnabar, intermixed withmore or less pyrite, and occurs in seams, sometimes an inch or twothick, of solid cinnabar. These seams are approximately parallel to theledge, and are crossed at high angles by other and rather minute ore 232 MINES AND MINERAL RESOURCES. seams. The serpentine is in part silicified and carries lenses of hard,fine-grained black jasperoid. At the time of onr visit (August, 1913), both the mine and thefurnace were in operation, with 16 men, all told, at workâ9 under-ground, 3 on top, and 4 on the furnace. On the outcrop some good orewas being stoped out to the surface. The furnace is a 50-ton Scott(see photo No. 19), and has special condenser arrangements designedby Mr. Rocca, in which the draft is controlled by dampers. It is said. Photo No. 19. Fifty-ton Scott furnace at the Helen Mine, near Middletown, Lake County,California. Old dumps of the Wall Street Mine in the distance. to work satisfactorily. The owner states that the ore being reducedaverages per cent quicksilver, and that he can handle at a profit orecarrying down to per cent of the metal. Soot from the con-densers, and occasional small lots of rich ore are treated in D retortsof 1000 pounds per day capacity. A small gasoline engine, run inter-mittently, furnishes power for the rock breaker. The furnace consumesli cords of firewood per twenty-four hours. The ore is trammed,horse-drawn, from mine to furnace in trains carrying 3 tons per the upper parts of the mine are difficult to work on account ofwater in the wet season, only development work on the lower levels isdone in winter. The mine is credited witli ?i totnl pro
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Keywords: ., bookauthorcaliforn, bookcentury1800, bookdecade1850, bookyear1853
