What can happen if the charge is separated by drillings left in the hole?

When drillings are left in a borehole that contains explosive charges, it can lead to a situation where the charge does not detonate properly. This may happen because the residual materials, such as drill cuttings, can obstruct the propagation of the explosive wave or interfere with the uniform distribution of the explosive material, causing what’s known as an incomplete explosion.

An incomplete explosion can leave portions of the charge unexploded, which poses a significant hazard, including the possibility of these remaining explosives igniting or burning afterwards. This scenario highlights the critical importance of ensuring a clean drilling process and thorough maintenance of the borehole to achieve safe, effective blasting. Understanding these risks underlines the need for proper charging techniques and adherence to safety protocols within explosive operations.