This paper reports the measured froth zone (R-f) and collection zone (R-c) recoveries in the flotation of pure quartz, pure hematite, and a quartz-hematite mixture with one of three corn starches with different mass ratios of amylose to amylopectin: waxy starch (0:100), normal starch (27:73), and Gelose 50 (50:50). The flotation tests were carried out at continuous mode using a three-product column at different pHs and starch concentrations with sodium oleate as collector and calcium chloride as activator. It was found that both R-f and R-c were significantly affected by pH and starch type and concentration. In the flotation of pure quartz or hematite, addition of each of the corn starches tested would decrease the R-f and R-c, with the effects following the order of waxy starch > normal starch > Gelose 50. The decreases in R-f and R-c coincided with the increase in the aggregate size caused by addition of these starches. Possible correlations between R-f, solid flux at the pulp-froth interface and R-c were examined. In the flotation of the quartz-hematite mixture, the changes in R-f and R-c of Fe caused by varying starch type and dosage were consistent with those in the flotation of pure hematite.