Nevada's Mineral Resources

Nevada's Mineral Resources

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1909 edition. Excerpt: ...more finely, like coarsely-powdered glass; and, still again, as fine as the finest sand. The sandy limestone occurs generally over the ore bodies, and rarely on the foot wall. When found on the foot wall it is accompanied by large boulders of limestone, which appear as if worn and rounded by the action of water. This fine material frequently gives rise to what the miners term "a run," filling up the stopcs, mixing with the ore, and causing the workings to cave in. It has not yet been analyzed, but is, doubtless, the residue of the less soluble of the dolomite. In color it is sometimes nearly white, sometimes ashy, drab, bluish or reddish. The vein-limestone is in many places brecciated and cemented together by calcareous exudations or infiltrations. This recementation has frequently been carried to such an extent that the matter has lost, not only all traces of its original stratification, but appears hard and compact, and rings under the hammer. Stains of iron and manganese, vugs containing low-grade ore, and large and small cavities, are found irregularly distributed throughout. These cavities often form huge natural caverns many feet in extent, both laterally and vertically, the sides and tops of which are covered with glittering stalactites and thick incrustations of acicular crystals of arragonite. In the bottom of the caves ore is invariably found. The first discovered of the larger caverns was near the surface, on the southern side of the hill, beneath the original ore body of the Champion claim. This was from 30 to 40 feet wide, about 20 feet high, and some 60 feet long. It lay almost in a direct line above the latest discovered huge cavern, the largest of all, at the extreme west end of the ninth level of the more

Product details

  • Paperback | 66 pages
  • 189 x 246 x 4mm | 136g
  • United States
  • English
  • black & white illustrations
  • 1236866304
  • 9781236866301