Underground magazines shall not be located within how many meters from shafts or other underground magazines?

• A. 50
• B. 100
• C. 150
• D. 200

Answer: (B)

Underground magazines store blasting materials, so keeping them a safe distance from shafts and from other underground magazines is crucial to prevent blast effects, heat, or fumes from reaching critical passages or equipment. The required minimum separation is 100 meters, meaning a magazine must be located at least 100 meters away from any shaft or from another underground magazine. If it were closer than that, the risk of a propagating blast or hazardous conditions spreading to nearby areas increases. Being farther away than 100 meters also meets the rule, but 100 meters is the threshold the regulation sets.