Authors : M.A. Saliu and J.M. Akande
Abstract: The main objective of this research is to design the most economic blast design the will give good fragmentation in aggregate and economical. The structural geological investigation of the deposit is carried out with combination of both window mapping and scanline mapping. The dip and dip direction of the two main joint sets as observed in this area are, 84/318 and 84/025, respectively. Investigation into the best method of breaking in-situ rock from this site show that the rock can only be broken by fragmented (i.e. drilling and blasting) because the deposit is having very large in-situ block size which can not economical break by other breaking methods (e.g. Ripper, Bull Dozer etc). The classification of the deposit shows that the rock falls in-group of very good rock using RMR and Q- system. The drilling and blasting pattern being used in Ore quarry is adapted using Langerford formula and some limit of application were suggested for various design above which poor fragmentation should be expected.
M.A. Saliu and J.M. Akande , 2007. Drilling and Blasting Pattern Selection for Fragmentation Optimization in Raycon Quarry Ore, Ondo State . Journal of Engineering and Applied Sciences, 2: 1768-1773.