The suitability of several minimum fluidization velocity correlations has been investigated for fine zinc slime, iron ore tailings, both pre and post hydro-cyclone uranium tailings, and a relatively coarse grade of fly ash. it has been found that most of the published correlations significantly underestimate the value of minimum fluidization velocity for the four different tailings materials. Predictions due to Van Heerden et al. (1951) [45], Noda et al. (1986) [76], Coltters and Rivas (2004) [39], and Xu and Zhu (2009) [93], agree reasonably with the experimental data, whereas the fly ash, which belongs to Geldart Group B materials, has shown a large deviation. Thus these correlations could be used for the fine tailings materials that comprise a variety of constituents and possess a degree of cohesiveness. A modification of Coltters and Rivas correlation has also been suggested to assess the combined effect of particle size and density on minimum fluidization velocity. (C) 2009 Elsevier B.V. All rights reserved.