Ground Control & Highwall Safety
What must be checked during highwall inspections?
Cracks, loose material, and water infiltration.
What determines the correct PPE for a task?
The specific hazards present.
What three elements make up the fire triangle?
Heat, fuel, oxygen.
What is a common sign of potential arc flash risk?
Corroded or damaged electrical enclosures.
What should miners do if their primary escape route is blocked?
Use the secondary escape route.
What environmental factor most affects slope stability?
Water saturation.
Why is housekeeping critical in mines?
It prevents slips, trips, and fire hazards.
What conditions require immediate evacuation?
Fire, explosion risk, toxic atmosphere.
What must lockout devices be able to do?
Withstand accidental removal.
What is the first step when equipment malfunctions?
Shut it down safely.
Why must benches be kept clear of loose material?
To prevent falling‑material hazards.
What may help with noise exposure?
Ear plugs, mufs, and caps
What is the backup method if radios fail?
Audible signals or visual signals.
What must be done before testing a circuit?
Verify de‑energization with a meter.
What should miners do if ground appears unstable?
Stay clear and report immediately.
What is a sign of potential rockfall?
Bulging or separating rock layers.
What is the main hazard of confined spaces?
Oxygen deficiency or toxic atmospheres.
What must first aid kits contain?
Supplies adequate for likely injuries.
Why are household extension cords prohibited?
They lack proper insulation and grounding.
What should miners do if they smell a strong chemical odor?
Move to fresh air and notify a supervisor.
What is the purpose of a ground control plan?
To outline methods for maintaining wall and slope stability.
How quickly must a fatal accident be reported to MSHA?
Within 15 minutes.
When is a fire watch required?
After hot work until area is cool and safe.
What must electrical enclosures remain free of?
Dirt, moisture, and obstructions.
What must miners do if required PPE is unavailable?
Do not perform the task until PPE is provided.