Question

Insufficient stemming causes

• A. Over breakage of coal
• B. Excessive vibration
• C. Blown out shot
• D. High powder factor

Hint:

Proper stemming prevents gas escape and ensures effective blasting.

Answer 1

The Correct Option is C

Stemming is the process of compacting inert material into a blast hole above the explosive charge. Insufficient stemming allows gases to escape, causing blown out shots.