Conventional single-feed coal flotation circuits do not efficiently recover coarse particles. Evidence is presented here that this loss of coarse coal is due to an inability to float coarse middlings material. Both flotation yield and selectivity are improved by replacing single feed flotation with split feed flotation incorporating the separate flotation of coarse and fine particles. While optimum yields from the coarse coal circuits are obtained at approximately the same values of aeration rate and impeller speed as for fine coal, coarse particles are much more sensitive to changes in these variables than fine particles. Froth mobility and froth structure are shown to be factors which limit the recovery of coarse coal. Mobile froths and close vanning are required for optimum coarse coal yields