A Study of the Gold & Silver Mines of Colombia

A Study of the Gold & Silver Mines of Colombia

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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. 1886 edition. Excerpt: ...living who have actually worked in the famous Espiritu Santo mine, from whom exact information has been obtained, no doubt can remain of its vast wealth and positive existence in that'place. "The Espiritu Santo mine was in operation down tothe-year 1727. It was well equipped; the actual vein of gold it contained was very extensive and of such fine metal that it exceeded 22 carats. The direction of the vein was inclined, or nearly perpendicular, so that it could be worked very profitably in spite of the great cost; it had five ladders of 12 or 15 steps each, for the use of the operators in entering the mine. There were also four wells in which the water that filtered through the earth was collected until it could be thrown into the river. "More than 200 men were employed in it, who worked alternately, night and day, and in separate operations; they followed the main vein and several branches, which at times were found to be very rich, taking out of the mine earth and pieces of flat stones containing gold, which were sent to be washed. The miners were so placed, that the ore, &c., was passed from hand to hand until the bottom of the shaft was reached, where, by means of a machine operated by two men in a wheel, it was drawn to the surface, where it was taken to the river to be washed. "The mine had four levels, but the lowest was the largest and widest. A great many miners worked in it without in the least interfering with each other. At intervals pillars of earth were left for support, and in some parts the excavations were lined with heavy timber as a protection against a cave-in. Unfortunately this precaution was not taken in the shaft where the two miners worked the.machine, and the gravity of the soil overcoming its...
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Product details

  • Paperback | 78 pages
  • 189 x 246 x 4mm | 154g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236647556
  • 9781236647559