"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 ...more > >