Compared to surface blasting, underground mining blasting is characterised by confined working spaces, smaller scales but more frequent blasts, and greater influence from geological conditions. Compared to underground roadway blasting, underground mining blasting typically involves more than two free faces, a larger number of blastholes, and more complex blast designs and initiation s... https://www.handarblasting.com/news/industry-knowledge/blasting-engineering-applications-safety/