Hydrometallurgy: Leaching in Heap, Vat, CIL, CIP, Merrill–Crowe, SX Solvent Extraction

Hydrometallurgy: Leaching in Heap, Vat, CIL, CIP, Merrill–Crowe, SX Solvent Extraction2017-04-04T06:57:36-04:00
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Gold Heap Leaching Metallurgy (2 replies)

Nyasha Jawanda
4 years ago
Nyasha Jawanda 4 years ago


What are the metallurgical issues considered when planning the construction of a heap leach for gold in oxide ores.

4 years ago
Jorge 4 years ago


There are several points to keep in mind, some of them are listed below,

  • Clay content. Make sure the clay content in the ore was determined properly in the testing program, otherwise there will be percolation problems. As a consequence, the gold extraction will be lower than expected.
  • Cyanicides. They can be dissolved and consume more cyanide. The gold extraction will be lower. The presence of copper oxides could be a problem.
  • The testing program should evaluate the optimum particle size. Gold extraction has an economic and metallurgical optimum point.
  • Pregnant solution should be as clean as possible, otherwise there will be some problems in the recovery system (activated carbon, Merrill-Crowe)
  • Cyanide strength, make sure to use the right one


4 years ago
David 4 years ago

Hi Nyasha and Welcome,

to complement to Jorge's comment, please see:

http://technology.infomine.com/reviews/heapleachpads/welcome.asp?view=full and https://www.911metallurgist.com/blog/heap-leaching

Hope this helps.

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