The objective of this paper is to present friction loss results for coarse and high density industrially comminuted mineral products. The aim is also to compare pilot scale and full scale experimental results with the slurry friction loss model proposed by Wilson et al. [ 1 ] for partially-stratified flows. The comparison focuses on flow conditions where the velocity clearly exceeds velocities for which there are risks of deposition. Complementary comparisons with the fully-stratified friction loss model proposed by Wilson et al. [1] is also made. The solids used in this study are quartz products, tailings and ores taken directly from in-plant crushing and milling processes, which in most cases provide broad particle size
distributions. Experimental results in pipes of 0.1-0.44 m i.d. for these products and a mixture of granite rock and tar sand tailings in mass proportions 1:9 were obtained for volumetric solids concentrations of up to 40%. Particle size distributions and relative solids densities are shown in Fig. 2.