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A Treatise on Metalliferous Minerals and Mining

A Treatise on Metalliferous Minerals and Mining


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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. 1881 Excerpt: ...in a profitable condition it was abandoned. Working was recommenced after two years' idleness, when Captain Williams, of a neighbouring mine, discovered a richer portion of the lode by costeaning. Another three years' operations brought no satisfactory result, and the mine was again near abandonment. Two men were, however, kept at work, and in 1862 a winze that was being sunk cut the lode where it showed good spots of ore. This discovery led to the driving of a cross-cut, which, at a distance of 150 yards from day, cut the lode in a productive state, at a depth of 60 yards from the surface. In April of the next year the first parcel of ore of 40 tons was sold, and from that date the mine has been one of the most successful in the kingdom. Its production of lead ore in 1876 was 6,850 tons, which also gave 5,136 ounces of silver. Fig. 83 is a cross section of the lode, and of the way in which it is approached, as well as of the strata it traverses. It is a monster lode, varying in width from 12 feet to 80 feet. It is largely filled with the redeposited material of the surrounding rock, which is traversed by veins of calcareous spar, quartz, and baryta. The ore is sometimes distributed throughout the whole mass in small bunches connected by strings, and sometimes it is most abundant near to one or other walls of the lode, chiefly the lower or heading side; but it is seldom present in LEAD MINING IN CARDIGANSHIRE. 207 surface the lode traverses dark soapy shale, and it is not very productive, the lode being filled with clay and occasional stones of ore. From this point down to 75 fathoms, as the lode traverses blue slaty rock, the upper part of the lode is also filled with clay (flucan), and the lower part is more solid and contains ore. The flucan thins out li...


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Product Details
  • ISBN-13: 9781130217209
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 126
  • Spine Width: 7 mm
  • Width: 189 mm
  • ISBN-10: 1130217205
  • Publisher Date: 01 Mar 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 240 gr


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