Blasting is the process of breaking of bulk rock masses into loose forms, using explosive compounds. Here, the primary role is played by the explosives. Keeping the powder factor and number of choices of explosives available as constant and by varying the parameters like drill hole diameter, number of holes can compare the explosive performance and accordingly helps taking a decision to select the proper type of explosives for blasting. The explosives are used to produce a volume of rapidly expanding gas that exerts sudden pressure on its surroundings and break the mass into pieces. Only permitted explosive & approved detonators are to be used.
The objective of this course is to improve the safety, knowledge and skill of persons engaged in Blasting operation. Main purpose and objective of blasting energy in the rock-breaking process is to reduce blasting cost through less explosive consumption and less wastage of explosive energy in blasting, less throw of materials, and reduction of blast vibration resulting in greater degrees of safety and stability to the nearby structures. Selection of proper explosive in any blasting round is an important aspect of optimum blast design foe safe and effective blasting.
In this module the following topics are covered:
1.Introduction on blasting?.
2. Explosives – Types, Class, Group of permitted explosive used in open cast mine?.
3. Initiating System- Detonators.
4. Transportation,Storage and handeling of explosive.
5. Shot firing tools.
6.Method of blasting in Open cast mines
7. Precautions of blasting .
8. Dealing Misfire.
9. Precautions against Fly Rock.
10.Statutory provision regarding Open cast blasting.
