Good charge distribution is fundamental to blasting. Good charge distribution significantly improves fragmentation efficiency, helps reduce energy consumption in downstream processes and improves safety. By optimising the spacing and concentration of explosives in blast holes, operators are able to better control rock fracture, with benefits for the entire mining value chain.
One of the primary outcomes of well-distributed charges is uniform particle size distribution after blasting. The appearance of oversized boulders is very often due to poor hole loading. For example, circumferential slit charges reduced average fragment sizes by 3–15 mm and lowered large block rates by 5.21%–27.44% compared to conventional methods (Zhang et al., 2023). Concentrated bottom charges (higher-density explosives at the hole base) also improve toe fragmentation, preventing hard toe issues and ensuring complete burden displacement (Drilling and Blasting Charge and Design • WipWare, n.d.).
By lowering the Bond Work Index (WI) by 20% to 30%, distributed charges immediately lessen the energy needed for grinding. Bond’s law simulations showed that optimised charge layouts improve the feed size (F80) to grinding circuits, reducing total comminution energy. According to research, energy transmission is improved by smaller drilling diameters and increased drilling density, which lowers the cost of electricity per tonne processed.
Proper energy distribution minimizes uncontrolled explosions at the blast collar, cutting fly rock risks (Drilling and Blasting Charge and Design • WipWare, n.d.). Decoupled charging structures (e.g., air/water gaps) lower seismic wave energy transmission by 15%–40%, mitigating vibration impacts on surrounding structures (Gu et al., 2015).
Reference
Drilling and Blasting Charge and Design • WipWare. (n.d.). Retrieved May 2, 2025, from https://wipware.com/drilling-and-blasting-charge-and-design/
Gu, W., Wang, Z., Chen, J., Liu, J., & Lu, M. (2015). Experimental and Theoretical Study on Influence of Different Charging Structures on Blasting Vibration Energy. Shock and Vibration, 2015(1), 248739. https://doi.org/10.1155/2015/248739
Zhang, Q., Wan, S., Huang, Y., Yan, T., Liu, B., & Liu, G. (2023). Study on the Influence of Circumferential Slit Charge on Blasting Fragmentation. In Advances in Frontier Research on Engineering Structures (pp. 558–566). IOS Press. https://doi.org/10.3233/ATDE230247
