The distribution performance of a flotation bank, consisting of a number of cells in a series is determined for different purposes such as process design, scale up, diagnosis, operation and control, and optimization. Traditionally in plant operation mass balances around the whole flotation bank is developed in order to characterize the overall recovery typically in rougher flotation. However, carrying out experiments to fit flotation rate models are seldom undertaken on industrial flotation banks due to laborious sampling, preparation and analysis. In this work, in order to investigate the effect of particle size distribution of the feed of rougher cells on metallurgical characteristics at Sungun copper plant, the kinetics of different size fractions through rougher bank was studied by using both traditional and Yianatos methods. The Yianatos method depends on collecting samples from only five locations. It is indicated that the Yianatos method can be beneficial in kinetic rate constant determination for the whole size range and the results were compared with the traditional method. (C) 2012 Elsevier B.V. All rights reserved.