Mineral Resources Volume 9-13

Mineral Resources Volume 9-13

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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. 1901 edition. Excerpt: ...caps and upper portions in almost every example yield rich values of copper glance, copper pyrites, native silver, silver sulphides, and gold, but apparently decrease markedly in value with increase of depth. Small crosscourses apparently have been decidedly influential in enriching reefs. The majority of the reefs possess a quartz gangue, containing from 10 to 15 per cent. pyrites. Exceptions are the Adeline and No. 9 lines, which contain considerably larger pyritic percentages. Zinc (as also lead) admixtures are common. Recovery of gold from the ores by ordinary crushing methods has proved insufficient on this field. Various concentrating schemes for saving copper have been adopted, such as crushing and treatment on Wilfley tables and Frue vanners. In many cases these have also proved unsatisfactory, owing to the exceedingly fine state of division in which the rich sooty copper glance occurs. ' When concentrated the ore is forwarded to various smelting companies for treatment. But seeing that a great portion of the rich oxidised and sulphuret masses have already been won, leaving the leaner and more complex pyritic ores, the expense of concentrating, with subsequent carriage to smelting works (about 2 per ton), has proved prohibitive to the great majority of the local miners. V Several attempts at local smelting (as the Adeline and White Rock ventures) have already been made, but without success. It has been suggested that the erection of a smelter at Drake would cause a revival in mining, and several years since an application was made for a Government smelter. The application was refused. Ore apparently does not here exist in quantity sufficient to warrant the erection of a water-jacket capable of dealing with from 10,000 to...show more

Product details

  • Paperback | 118 pages
  • 189 x 246 x 6mm | 227g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236743202
  • 9781236743206