Fine (<20 µm) valuable mineral particles are difficult to recover in conventional flotation circuits. (trahar and warren, 1976; jameson, nguyen and ata, 2007; kohmuench et al, 2018). this leads to a loss of valuable fine mineral particles to tailings. recovering these particles would be of economic benefit. novel reagents, including temperature responsive polymers, for example, are being developed to improve recovery of fine valuable mineral particles by froth flotation (ng et al, 2018a, 2018b). the approach involves selectively aggregating the valuable fine particles and making these aggregates hydrophobic, resulting in hydrophobic aggregates of appropriate size (in order of 100 microns) being amenable to recovery by froth flotation. the polymers developed have been produced at laboratory scale but not a full scale yet. the exact cost of producing such novel polymers is currently unknown, but they are likely to be more expensive than conventional reagents.>