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Home > Sciences & Environment > Earth sciences > Geology, geomorphology and the lithosphere > Geological Guide-Book for an Excursion to the Rocky Mountains
Geological Guide-Book for an Excursion to the Rocky Mountains

Geological Guide-Book for an Excursion to the Rocky Mountains


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About the Book

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1894 Excerpt: ... occur in a series of veins in the granites, standing nearly vertical and having a general east and west trend. None so far as known have been found in the rhyolite. These veins are rock fractures produced by dynamic force and show evidence of a faulting movement in striated surfaces and zones of broken or crushed country rock, but have comparatively little selvage matter or clay walls. Each great mine consists as a rule of several parallel fractures or fissures, with minor cross-courses or fractures nearly at right angles with the main fissures; these sometimes appear to fault them, but it is by no means certain that they are later fractures. The ore is largely a replacement of the country rock from the oinginal fissures outwards, it being often possible to trace a gradual transition from solid ore, through partially altered, into entirely unaltered granite, with no defined plane of demarcation or wall. In the silver mines the ore body or vein matter is often six to eight feet wide. In the copper mines much greater thicknesses of solid copper glance (chalcocite), sometimes 20 to 30 feet (6 to 9 m.) wide, are found. The most common minerals in the silver mines are pyrite, sphalerite or zincblende, galena, and sulphides of silver, with manganese in the form of rhodocrosite or rhodonite, and little or no copper. Gold forms an important value in some ores, but it is rarely visible. In the copper mines chalcocite, chalcopyrite, bornite, and enargite are the prevailing valuable minerals, but zincblende and the manganese minerals are almost entirely absent. Quartz is the general gangue material, and has apparently been derived by lateral secretion from the adjoining granites. Barite and fluorspar are also found. The oxidation of the manganese minerals, which form...


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Product Details
  • ISBN-13: 9781150666391
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 94
  • Spine Width: 5 mm
  • Width: 189 mm
  • ISBN-10: 1150666390
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 181 gr


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