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From that work the entire flotation circuits were replaced with higher conventional cell capacities on both the Pb and Zn circuits, additional flotation columns were installed on both the Pb and Zn circuits, Pb and Zn unit cells were installed and cleaner scavenger circuits were installed.

Results and metallurgical observations made during the froth sprinkling evaluations lead to followup Qem Scan mineralogical analyses that showed significant metallurgical opportunities could be obtained through flowsheet optimization.

Subsequent plant flowsheet modifications were tested on the existing old circuit by actually redirecting flows to simulate different flowsheets and circuit residence times to assess metallurgical impact.

A significant USA Pb-Zn-Ag mill had process improvement opportunities to capture and equipment obsolescence issues to contend.

Bill Hancock developed a practical plan for froth washing to improve lead concentrate grades that offered significant shipping cost reductions.