Gold and Silver occur natively here and there but much more commonly they occur with Sulfides and Tellurides. In order to separate the Gold and Silver from say a sulfide ore one of the methods used is known as Roasting. The process involves heating up the ores with certain salts in order to burn off the sulfides allowing you to recover the precious metals. There are many different charges and salts you may need to use depending on whether the ore is a Gold Telluride, A Gold-Silver Telluride, or a Copper-Silver Sulfide etc. This book discusses the different temperatures and mixtures that you need based on the type of ore you roasting. These methods are still used today in a lot of process plants. Once the ore is roasted the Gold and Silver can be recovered more easily by leaching and precipitation or by gravity methods which are all discussed in this book. Long out of print this book is now available again from Miningbooks.com.

The gold processing industry is experiencing change. As free-milling and oxide ores become depleted, more complex polymetallic and refractory ores are being processed, coupled with increasing pressure for stricter environmental compliance. Recent years have also seen a steady reduction in mineral processing and metallurgy graduates and a gradual loss of older operating experience. A contribution to documenting current and future best practice in gold ore processing seems timely.The focus of this volume is on advances in current gold plant operation, from conception to closure; chapters also cover innovations at the bench and pilot-scale level that would be expected to find commercial application at some stage. Sufficient coverage is also given to the chemistry and engineering aspects. The general principle behind the structure of the volume is that of flowsheeting based on unit operations and applied to a mineralogical classification of gold ore types. From concept to closure, this book covers all unit operations, mineralogies and processes that are relevant to dealing with today's complex orebodies.Practical experience is vital to the successful development, operation and closure of any operation. The 42 chapters have been contributed by a total of 66 authors and co-authors who are experts from countries spanning the globe, and representing exhaustive practical knowledge covering many disciplines relevant to gold processing.* Current best practice as elucidated by a select panel of experts in the field* Innovations at the bench and pilot-scale level that would be expected to find commercial application at some stage* Mineralogical-based approach to flowsheeting

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