Why should a blast design be drilled correctly?

Correct drilling of blast designs will ensure safety hazards such as over break, fly rock or air blast overpressure are significantly reduced. The drilling site should be prepared, and drill holes marked before drilling.

Why is mastering rock drilling & blasting important?

In conclusion, mastering rock drilling and blasting techniques is paramount for safe, efficient, and cost-effective rock excavation. By carefully planning, selecting appropriate drilling tools and explosives, and adhering to rigorous safety protocols, projects in mining, construction, and quarrying can achieve optimal results.

Should drilling and blasting be performed under the same supervisor?

Operations where drilling and blasting are performed under the same supervisor or by the same crews are highly recommended, in that this allows both crews to work closely to maintain efficient borehole drilling and loading. Drilling information can be conveyed from the drilling crew to the blasting crew by means of stakes placed at each blasthole.

What happens if a blasthole fires out of sequence?

Unfortunately, scatter in the delay times of the most commonly used open pit blasting systems can sometimes cause the blastholes to fire out of sequence, and this can produce poor fragmentation as well as severe damage to the rock which is to remain to form stable slopes.

How does blast damage affect the final wall?

The two areas that have the greatest impact on blast damage to the final wall are pre-splitting and trim blasting. Very often pre-splitting is not carried out in quarries, partly because of the cost, but mostly because the smaller-diameter holes and charges that are used in quarries tend not to be as damaging as larger-diameter blastholes.

How does a rock blast work?

These blasting methods, which involve the simultaneous detonation of a row of closely spaced, lightly charged holes, are designed to create a clean separation surface between the rock to be blasted and the rock which is to remain. When correctly performed, these blasts can produce very clean faces with a minimum of overbreak and disturbance.