In October 1980 the two existing flotation circuits were combined into a single new circuit. This circuit used modern 11.3 m3 flotation cells which replaced 1.4 m3 units._x000D_
Sometime after this change, a significant deterioration in metallurgical performance occurred. This paper describes the work done to discover the causes of deterioration in performance and actions taken. The program implemented to prevent a future occurrence is also presented. The work included analysis of routine plant data, analysis of surveys to obtain element and mineral flows on both a sized and unsized basis, some quantitative mineralogy, and analysis of some external factors.