"Whilst working on an alluvial claim that incorporated a Knelson concentrator, I was impressed with its catch ratio. This was ultra fine beach gold and was contained in a sand that contained a high percentage of ilmenite and various other heavy minerals. The Knelson rejected these associated heavy minerals and retained an exceptional percentage of the ultra fine gold. I set up a set of gold catching tables and treated the discharge from Knelson. From this I was able to ascertain the catch rate for the Knelson was close to 98%. I did get a bonus one day when there was a major malfunction with the water pressure and eight hours production somehow got flushed out the discharge pipe, ultimately to be caught on the table. So it was a case of a gold recovery process over a 100 years old working in conjunction with a modern system. The Knelson got its 98% and I got the other 2% on the table. Truly a 100 percent recovery system."
- Trevor Alty, Owner - Buller Gold Dredging, New Zealand
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