. The copper resources of California. number outcrop onthe hillside. They expect to finally strike a very wide ledge,the main croppings of which, about 100 feet wide, are near thesummit of the hill. The course of this vein is east of thirteen parallel veins vary from 5 to 30 feet in width on 168 THE COPPER RESOURCES OF CALIFORNIA. the outcrops. All of them show chalcopyrites. A shaft nearthe hilltop follows the loo-foot vein pitching to the east, whichshows some very good red oxide, carbonate, and sulphide formation that incloses the mineral is a hard diabase. The L,ast Chan
. The copper resources of California. number outcrop onthe hillside. They expect to finally strike a very wide ledge,the main croppings of which, about 100 feet wide, are near thesummit of the hill. The course of this vein is east of thirteen parallel veins vary from 5 to 30 feet in width on 168 THE COPPER RESOURCES OF CALIFORNIA. the outcrops. All of them show chalcopyrites. A shaft nearthe hilltop follows the loo-foot vein pitching to the east, whichshows some very good red oxide, carbonate, and sulphide formation that incloses the mineral is a hard diabase. The L,ast Chance is opened by a shaft 240 feet deep, withsteam hoisting works. The vein is 5 to 8 feet wide, carryingpyrites and chalcopyrites in considerable quantities. Somegood ore now lies on the dump. There was considerable oreshipped from this mine as long ago as 1876. The pyriteoccurs in this mine, as well as in all others in the district, inlens-shaped bodies, the inclosing formation being a hard, dark-blue diabase. >\ ..;->-^^\. Sketch Map or Mineral , or Minks. Kast of the Last Chance is a series of diorite and quartzledges, wide and of low grade, of which little is known. Theyvary from 3 to 100 feet in thickness. One ledge exposed onthe hill, and owned by the First National Bank of San Fran-cisco, is fully 100 feet wide and is traceable for over two ledges occur in succession until the east grano-dioritewall is reached. The Green Lead was worked .some years ago, and appearsto have a large deposit of good ore. It is in Sec. 12, T. 15 N.,R. 6 E., and is opened by two shafts each about 160 feet ores are peacock copper (bornite), chalcopyrites, and redoxide, mixed with quartz. Formation same as Last has been shipped to San Francisco at various times. NKVADA COUNTY COPPKR MINES AND CLAIMS. 169 The Golden Eagle is opened b}- a shaft 15 feet deep, showinga 4-foot vein of sulphide of copper and iron. At the north endline, on a vein w
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