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Geological Survey Professional Paper Volume 162-163

Geological Survey Professional Paper Volume 162-163


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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. 1987* Excerpt: ...2-ton samples were collected, broken, and quartered for assay. The average of the 32 samples was 0.073 ounce of gold to the ton, or if one sample containing 0.41 ounce to the ton is omitted, the average of the remaining 31 samples was 0.06 ounce. These results are too discordant to permit an assured conclusion concerning the probable average content of gold in the dike but leave no doubt that it is higher than the average in such rocks. CLEMENTINA MINE The Clementina mine (No. 23, pl. 30) lies about 3,000 feet southeast of the Keystone. The claim was one of several located early in 1892, when it became apparent that there was high-grade gold ore in the Keystone mine. The workings include a shaft 75 feet deep and a tunnel 110 feet long, with a shaft 75 feet deep near the entrance. In this area the dark dolomites about 2,000 ieet below the top of the Goodsprings formation strike northwest and dip 5 to 10 SW. The principal source of the gold produced is a shear zone that trends N. 50 W. and dips steeply southwest, along which there were lenses and irregular masses of gold-bearing ferruginous chert, slightly stained with malachite and chrysocolla. This deposit is credited with having shipped 13 tons of material to the smelter which yielded a total of 10 ounces of gold, 8 ounces of silver, and 522 pounds of copper. GOLDEN CHARIOT CLAIM The Golden Chariot claim (No. 24, pl. 30) lies half a mile west of the Keystone mine. The principal exploration is a tunnel that trends generally southeast for about 200 feet. The workings explore several iron-stained shear zones that trend northwest and dip northeast and are wholly in a sill of granite porphyry. There are two small stopes above the tunnel level, one of which extends to the surface. Several hundred tons of materi...


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Product Details
  • ISBN-13: 9781231241875
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 164
  • Spine Width: 9 mm
  • Width: 189 mm
  • ISBN-10: 123124187X
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 304 gr


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