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Cyanide Processes: (English)

Cyanide Processes: (English)

          
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About the Book

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: CHAPTER II. AMALGAMATION. REFRACTORY ORES?TAILINGS AND CONCENTRATES. Under the heading of refractory ores come those parts of free-milling ores which cannot be delivered of their gold by mercury. With good stamp-mill practice, there will float away in the slimes or tailings a percentage of gold if wet stamping is followed, and the same percentage of loss occurs when dry crushing is practised. The cause of this loss will be stated later on. Ores containing the precious metals, free-milling at the surface very often become refractory when they reach a depth where the elements cannot obtain access to them; this depth is usually water-level. The cyanide process is particularly adapted to this class of ores. To obtain the gold from free-milling ores mercury is placed in the mortar of the stamp-mill batteries, and amalgamated copper plates placed so that the gold going over them with slimes may be captured by the mercury on the plates. This amalgamation, as it is called, will recover by good mill-work 60$ of the gold in the ore. The various reasons advanced why more gold is not recovered are that the particles are too fine, and that others are covered with a film of oxide, sulphide, or tarnish which prevents the mercury from coming in contact with the gold, thus preventing its uniting with it. These fine particles and tarnished gold are virtually then refractory. After they have left the stamps they are termed tailings. It has been customary to grind these tailings in a pan with mercury, or to concentrate them by vanners, bumping-tables, or other means. The cyanide process acts very readily and completely on most tailings, so that its introduction has been the means of recovering -immense quantities of gold from tailings. Those ores which carry sulphides, tellurides, a...


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Product Details
  • ISBN-13: 9781459064942
  • Publisher: General Books
  • Publisher Imprint: General Books
  • Height: 246 mm
  • No of Pages: 26
  • Series Title: English
  • Weight: 68 gr
  • ISBN-10: 1459064941
  • Publisher Date: 01 Jan 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Spine Width: 1 mm
  • Width: 189 mm


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