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Excellent Results on Polymetallic Ore Types

Excellent Results on Polymetallic Ore Types

Gekko Systems | 01 October 2013

There is an increasing demand from customers to test the capability of the continuous IPJ gravity device to pre-concentrate polymetallic ores.

There is an increasing demand from customers to test the capability of the continuous IPJ gravity device to pre-concentrate polymetallic ores. In many cases the test work combines fine crushing (eg VSI) with the IPJ.

Excellent Results on Polymetallic Ore Types
Gravity recovery yield curve at the -8mm +4mm size fraction showing high amenability for gangue rejection

The uniqueness of the IPJ allows it to be used in applications where there is a broad range of particle sizes. Polymetallics have not been a target for traditional batch gravity separation devices. However, they have shown excellent results with continuous coarse gravity separation.

For example, at Silver Standard’s Pirquitas mine in Argentina, a modular nest of IPJs was installed in 2011 for pre-concentration of silver, tin and zinc ahead of the milling circuit. At a coarse crush size of ~12mm, the ore was upgraded by 100% using the IPJ. 

at Silver Standard’s Pirquitas mine in Argentina, a modular nest of IPJs was installed in 2011 for pre-concentration of silver, tin and zinc ahead of the milling circuit

The graph (right) indicates the gravity recovery performance for a polymetallic sample tested at Gekko’s metallurgical facility in Central Victoria, Australia.

The results reflect up to 40% of the mass could be rejected at -8mm +4mm and still retain 90-96% of the polymetallics.

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