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MEI Online: Plant Operation News: Australasia: February 13th 2004


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:: Knelson Concentrators and ConSep ACACIA Work in Harmony

Harmony Hill 50, located at Mount Magnet in Western Australia, managed to pull of a coup when it successfully purchased the ex-Union Reefs Transportable ConSep ACACIA, and the ex-Browns Creek CD30 Knelson Concentrator.

The Hill 50 plant was reporting spotty, slow leaching gold within the tails stream, and it was thought that the combination of a Knelson Concentrator and a ConSep ACACIA would stabilise the tails, and as a result improve recoveries.

ConSep were involved in the test work and design stage, assisting with prediction of gravity system recovery performance, and with general arrangement layout drawings.

The system was installed in May 2002, and consisted of a DSM screen, KC-CD30 Knelson Concentrator and a CS2000M ConSep ACACIA. The gravity circuit produced a significant boost to the plants performance. Recovery increased by a measured 1.48%, and solids tails standard deviation, as a measure of spotty gold, reduced by 30%. Gravity recovery has averaged 24% since installation and through further circuit optimisation, has been steadily increasing to the low 30's.

Given the low cost installation, with second hand equipment and site fabrication and management of the installation, the installation has been a great success for the Harmony site. It is just unfortunate for other sites wishing to repeat their success, that the ex-Union Reef's transportable ACACIA pilot plant was the only second hand plant available worldwide, and so such a success is unlikely to be repeated elsewhere in the world in the near future.




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