California mines and minerals . ^. [There is a large deposit of copper ore on Eel River, in the south-western part of Trinity County. The above is a photograph of ahuge boulder, or solid mass of chalcopyrite ore, which, from measure-ment, is calculated to contain 6,400 tons above the ground. It carriesten per cent copper, and $ per ton in gold and silver. This huge mass apparently slipped down from the ledge, situatedsome 300 yards above, where there is some 10,000 tons of the sameore in place, and lays on a little flat, with several thousand tons offloat in smaller form. The property is k
California mines and minerals . ^. [There is a large deposit of copper ore on Eel River, in the south-western part of Trinity County. The above is a photograph of ahuge boulder, or solid mass of chalcopyrite ore, which, from measure-ment, is calculated to contain 6,400 tons above the ground. It carriesten per cent copper, and $ per ton in gold and silver. This huge mass apparently slipped down from the ledge, situatedsome 300 yards above, where there is some 10,000 tons of the sameore in place, and lays on a little flat, with several thousand tons offloat in smaller form. The property is known as the Island MountainCopper Mines, and is partly owned and controlled by Frank A. Leach,Superintendent of U. S. Mint.] THE COPPER RESOURCES OF CALIFORNIA 217 The Sierra, or Copperopolis Belt.—The veins in this region, inwhich copper occurs, are essentially fissure veins, and entirely differ-ent from the lenticular mass formation of the Shasta copper are all found in the metamorphic slates which lie west of, andar
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Keywords: ., bo, bookcentury1800, bookdecade1890, bookidcaliforniaminesm00cali
