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The Comstock Lode; Its Character, and the Probable Mode of Its Continuance in Depth

The Comstock Lode; Its Character, and the Probable Mode of Its Continuance in Depth


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Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: 7'th. All the principal accumulations of ore are at those places where most room was given in the fissure for the deposition of quartz, and are therefore generally rare where an unusual amount of horses obstruct the vein (except North Potosi chimney in Gould and Curry mine). I have dwelt on the subject of the distribution of the ore in the Comstock vein to some length, because I consider its examination as being of great importance to enable us to draw conclusions in regard to the mode of continuance of the vein in depth. COMSTOCK VEIN A TRUE FISSURE VEIN. A true fissure vein may be designated as a fissure proceeding from indefinite depth and filled mainly from below, by chemical processes, with matter differing in nature from the country-rock. Great importance appears lately to have been attached to the question whether the Comstock vein is a true fissure vein or not. Though it would be a perfect absurdity to range it among any other class of mineral veins, yet this question will be examined in the following pages, and I will try to show that the Comstock vein possesses, more than almost any other vein, all the peculiar features of a true fissure vein. As such may be considered: st. A true fissure vein extends indiscriminately through different rocks. It was mentioned in theforegoing pages that the Comstock lode is but in part of its course enclosed between syenite and propylite on both sides, and, again, at others has metamorphic slate, especially quartzite and hornblendic rocks, on the western, and propylite on the eastern side. 2d. True Assure veins extend down to indefinite depth. This fact cannot be practically proved in any other way than by following the vein in its downward course. A few veins have been worked to the depth of a little over 2,000 feet. ...


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Product Details
  • ISBN-13: 9780217073578
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 20
  • Spine Width: 1 mm
  • Width: 189 mm
  • ISBN-10: 0217073573
  • Publisher Date: 05 Jul 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 54 gr


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