"Pasminco's Rosebery Mine installed one of the earliest manual discharge KC-25's in the secondary grinding circuit to recover free-milling gold. A second automatic discharge was installed in the primary grinding stage in the early 1990s. The performance of this unit was so good that it rendered the first installed unit redundant. In 1998, we added a second unit to the primary grinding stage to increase gold recovery further. We also purchased a laboratory size 6" Knelson, which we used extensively in our Ore Characterisation programmes. Gold recovery to dore improved from a mere 10% to almost 30% in 1999-2000."
- Christopher Mwaba, Senior Projects Metallurgist - Pasminco Ltd., Australia
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The advent of continuous gravity technology affords the opportunity to capture not only the free liberated gold, but also the gold carrying species into a small, high-grade concentrate. This concentrate can then be treated under more intensive conditions in a small, dedicated plant for maximum recovery. 
