A description is given of recent developments in flotation control strategy at Peak Downs Mine based on the ASHSCAN coal gauge.Addnl. tests undertaken to enhance this control strategy are detailed.Both short and long term behavior is outlined, particularly in relation to the concentrate froth.Simple empirical relationships are derived between concentrate ash % and several key operating parameters.Froth mobility is discussed in terms of a sharp transitional phenomenon between two different froth regimes.In the mobile regime, characterized by free flowing watery froth, concentrate ash can be readily controlled by manipulating pulp level.However, no such control is possible in the immobile regime, characterized by a viscous dry froth.Online data logging has also uncovered underlying long term plant cyclic behavior.