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Home > Art, Film & Photography > The Miner's Geology and Prospector's Guide; For Mining Students, Miners, Prospectors, and Explorers
The Miner's Geology and Prospector's Guide; For Mining Students, Miners, Prospectors, and Explorers

The Miner's Geology and Prospector's Guide; For Mining Students, Miners, Prospectors, and Explorers


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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. 1907 Excerpt: ... of iron) contained in the stone or associated with the ore. However, there are valuable mineral veins in some districts where there is no iron, therefore "gossans" and ferruginous indications are entirely absent. This name has been given by Cornish miners, and the equivalent terms in French, chapeau de fer, and German, eiserne hut, mean the same, an "iron hat." A gossan, snuffy brown in colour and of great porosity, is the best surface indication of the value of a lode at depth. In gossans of the veins of precious metals a concentration of the metal has always taken place. In the weathering of the surface the contents of the vein were also worn away, but the metal then became concentrated in the upper portions of the gossan, thus enriching it from those parts of the gossan that had been so destroyed. Such enrichments in gossans must be remembered in estimating the true value of a lode, as it is palpably unsafe to arrive at the actual average value of it until the undecomposed ore below water drainage level has been cut and sampled. Thus in the course of ages the disintegrating and breaking down forces in producing the sedimentary rocks at the same time liberated the precious metal, which owing to its nature was incapable of decomposition, so survived and found new resting-places in these rocks of various ages. Where copper pyrite occurs in gossans it becomes changed and carried away in solution, leaving the gossans porous. Arsenic is also one of the metals frequently present with ferruginous outcrops, also native silver and copper. With increasing depths these products of decomposition pass into sulphides, etc. CHAPTER XII. MINING, PROSPECTING. There are certain colours of stains peculiar to certain minerals about the outcrops and rocks...


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Product Details
  • ISBN-13: 9781130753844
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 52
  • Spine Width: 3 mm
  • Width: 189 mm
  • ISBN-10: 1130753840
  • Publisher Date: 01 Mar 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 109 gr


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