Once the holes have been drilled, the next step is to carefully load them with explosives. Detonators are attached to each explosive and the explosive devices are also attached to each other. The quantity of explosives in a hole varies, but harder rocks require more explosives.
The holes are blasted sequentially, beginning in the center and then cascading outward. Although there can be hundreds of individual explosions, the entire blast sequence should take no more than a few seconds. It’s extremely important to ensure that the explosives don’t detonate at the same time, but go one after another in specified intervals.