In the drop weight test, a known mass falls through a given height onto a single particle providing an event that allows characterisation of the ore under impact breakage. Although, the drop weight test has advantages in terms of statistical reliability and the potential use of the data from the analysis, it has a number of disadvantages, including necessity a special apparatus, tiring and particularly the length of time taken to carry out a test. For each drop weight test, 15 samples are tested in five size fractions at three levels of energy input [10], [11], [12] and [13].