MSHA Explosives and Blasting 1

Question 1

Under MSHA regulations, who is authorized to handle and use explosives in underground mines?

Accepted Answer

A certified blaster who holds a valid blaster's certificate

Answer

MSHA 30 CFR Part 57 requires that only certified blasters who hold a valid blaster's certificate are authorized to handle and use explosives in underground metal and nonmetal mines.

Question 2

What is the minimum distance that must be maintained between detonators (blasting caps) and other explosives during transportation in a mine?

Accepted Answer

Detonators must be transported separately from other explosives

Answer

MSHA regulations require that electric detonators and other explosives be transported separately to prevent accidental initiation.

Question 3

Before loading explosives into a borehole, MSHA requires that the hole be checked with which of the following?

Accepted Answer

A wooden or non-sparking loading stick

Answer

MSHA requires the use of a non-conductive, non-sparking wooden or plastic loading stick to prevent accidental detonation when loading explosives.

Question 4

According to MSHA standards, what must be done if a misfire (failed blast) is suspected in an underground coal mine?

Accepted Answer

Wait at least 30 minutes before returning and follow specific misfire procedures

Answer

MSHA regulations require miners to wait at least 30 minutes before re-entering an area with a suspected misfire and to follow strict procedures to safely handle the unexploded charge.

Question 5

What type of container is required by MSHA for storing electric detonators (blasting caps) at a mine site?

Accepted Answer

A separate locked magazine, apart from other explosives

Answer

MSHA regulations require that electric detonators be stored in a separate locked magazine away from other explosives to reduce the risk of sympathetic detonation.

MSHA - Mine Safety and Health Administration Practice Test

MSHA - Mine Safety and Health Administration Practice Test

MSHA Explosives and Blasting 1