Gold-Mining and Assaying; A Scientific Guide for Australian Emigrants
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Gold-Mining and Assaying; A Scientific Guide for Australian Emigrants

Gold-Mining and Assaying; A Scientific Guide for Australian Emigrants


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Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: METHOD OF EXAMINING AURIFEROUS DEPOSITS. When a country is suspected to contain gold, the points to be most carefully examined are the sands of the rivers and streams flowing through it, as well as the particles of disintegrated rock which often accumulate in the eddies of ravines formed on the sides of hills by the action of water during great floods. The sections of rock thus laid bare are also to be examined, with a view to the discovery of veins of auriferous quartz, from which specimens must be broken, and afterwards carefully assayed. In examining the sands brought down by rivers, such portions should be selected for experiment as have, from local causes, been subjected to the action of rapid currents and eddies; since, from the great density of the metal sought, it invariably accumulates in those situations. It is usually found, and particularly in the Australian gold fields, that if a river or creek produces fine scaly gold in those parts of its course which lie through a flat, open country, it will, if followed into the mountainous districts in the direction of its source, become more productive, and yield gold in the form of nuggets and less finely-divided grains. The METHOD OF EXAMINING AURIFEROUS DEPOSITS. 39 most productive localities hitherto found have been the bends or curves of rivers, and in these places the conformation of the banks on the convex and concave sides of the stream are found to be materially different. On the convex side, the banks in these cases consist of long slopes, opposite to which are nearly perpendicular bluffs. These slopes appear to have been formed by the reverberation of the stream from the opposite perpendicular cliff, and on all such slopes the gold is found to be much more plentiful than on the banks of the same river, wher...


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Product Details
  • ISBN-13: 9781459096707
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 52
  • Spine Width: 3 mm
  • Width: 189 mm
  • ISBN-10: 1459096703
  • Publisher Date: 01 Jun 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 109 gr


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