Useful and Precious Minerals; How to Find Them, How to Test Them and How to Estimate Their Value by Simple Methods and Easily Obtained Appliances

Useful and Precious Minerals; How to Find Them, How to Test Them and How to Estimate Their Value by Simple Methods and Easily Obtained Appliances : Intended for the Use of Non-Experts

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1902 edition. Excerpt: ... by the heat of the best furnaces fed only with common air. It fuses readily, however, before the oxyhydrogen blowpipe, and may be easily melted on charcoal if the blowpipe be fed with oxygen gas instead of air. Platinum ore is a most complex mixture of mineralogical-species, including, besides platinum, a number of heavy metals--osmiridium, iron-platinum, platiniridium, palladium, gold, etc. It also contains a number of nonmetallic minerals, notably chrome-iron ore, magnetic oxide of iron, zircon, corundum and, occasionally, a diamond, The metallic components always form detached granules, which are generally small--less than the size of linseed. although in some cases they equal hempseed and even peas. Occasionally, however, a large one is found. the largest being that in the Demidoff Museum; this is a native platinum lump weighing 21 lbs troy. The ore was first discovered in South America; it is found there chiefly in the Provinces of Choco and Barbacos, New Granada, and also in Brazil. It occurs besides in San Domingo, in California, at the Rogue River in Oregon, in Canada and in the Island of Borneo. But the richest deposits are those of the Ural Mountains; these were discovered about 1823, and since 1828 have been extensively worked by the Russian Government. Platinum has also been found in paying quantities in British Columbia, associated with gold, and those who go prospecting in the Klondike region would do well to keep a sharp look-out for it. ' It is more than probable that tons of platinum have been thrown aside as useless waste by the gold miners on our Western coast owing to the fact that they did not know what it was. It is therefore well to say that any deposit of great specific gravity should always be carefully examined, ...show more

Product details

  • Paperback | 26 pages
  • 189 x 246 x 1mm | 68g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236870948
  • 9781236870940