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Gravity Leaching - The ACACIA Reactor
Barrie Watson - ConSep Pty., Western Australia Office
Grant Steward - ConSep Pty., New South Wales Office
May 14th, 2002
Gravity Leaching of high grade gravity gold concentrates, such as Knelson Concentrates, with the ConSep ACACIA Reactor represents a new generation of concentrate treatment methods. The ConSep ACACIA Reactor is a complete packaged plant for the maximising of gold recoveries from gravity gold concentrates. This paper will introduce the process technology and provide process results from the Porgera ConSep ACACIA Reactor installation.
The advantages of the ConSep ACACIA Reactor are many, and justification for installation has been varied. The typical advantages of the process include:
- Increased recovery of gold from the Knelson Concentrate
- No return of high grade table tails, often grading several thousand g/t, into the mill circuit
- Reduction in tails grades of slow leaching gold
- Reduction in the requirement for operations staff by the removal of the manual tabling process and replacing with a fully automated treatment system
- Improved security by removing the tabling step where operations staff come into direct contact with visible gold
- Improved health and safety, by the removal of the treatment steps for the table concentrate, which often include operators handling corrosive chemicals and the production of sulphur and arsenic compound fumes
- Improved metallurgical accounting, by allowing daily head grade calculations
The ConSep ACACIA Reactor was developed by Anglogold for Union Reef's Gold Plant and has been in production for over two years, and has proven to be a low cost, high recovery, mechanically reliable method for the processing of gold concentrates. Such has been the success of the plant, there are now four full installations of the processing plant, including Anglogold Union Reef's, Anglogold Sunrise Dam, PACMIN Carosue Dam and Porgera Joint Venture.
For further information on the ConSep ACACIA Reactor, click here.
Download the full paper here.
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"The first time I used a Knelson concentrator was back in 1994 when working for an alluvial evaluation project in eastern Senegal for Anglo American Corp. (now AngloGold). Our work was made easier and the downstream local gold panners were amazed. Thanks to all of you."
- Babacar Diouf, Project Geologist - Randgold Resources, Senegal
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