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Blaster interview questions, and what the answers should cover

A blaster interview is really a safety audit with a handshake. The person across the table is picturing you alone on a bench with a loaded shot and a road full of pickups, and every question is a way of checking what you'd do there. Expect fewer questions about ambition and more about misfires, paperwork and the time you told somebody no.

11 questions7 minute read

Part 1

1.Walk me through how you'd plan and fire a typical bench shot, start to finish.

Why they ask

It's the whole job in one answer. They want to hear sequence, and whether you skip the dull steps.

How to answer

  • Start with the drill log and a walk of the face: burden, spacing, hole depth, water, cracks or voids
  • Explain how you pick product and load per hole, including stemming height and decking around seams
  • Describe laying out the delay timing so the rock moves toward the free face
  • Cover guarding, warning signals, clearing the area and the all-clear before firing
  • Finish with the post-shot inspection, seismograph readings and the blast log

2.You've fired a shot and one hole didn't go. What do you do?

Why they ask

Misfire handling is where people get hurt, and it's the question every blasting manager asks.

How to answer

  • Keep the guards up and nobody enters the area until the waiting period in your site's plan has passed
  • Inspect from a safe position and identify the misfired hole from the pattern and tie-in
  • Follow the company and regulatory misfire procedure, whether that's re-priming, washing out stemming or re-shooting
  • Report it, record it in the blast log and figure out the cause before the next shot

3.How do you keep vibration and airblast down on a job near houses?

Why they ask

Complaints and lawsuits cost them more than rock does. They want a blaster who shoots for the neighbors.

How to answer

  • Reduce the charge fired per delay by decking holes or adding delays
  • Use enough stemming, with crushed stone rather than drill cuttings where you can
  • Watch detonating cord on the surface and avoid shooting in low cloud or with wind toward homes
  • Place seismographs at the closest structures and review every reading
  • Mention pre-blast surveys and calling neighbors before shots
4.Tell me about a time flyrock went somewhere it shouldn't have, or nearly did.

Why they ask

Every experienced blaster has a close call. Honesty about it tells them more than a clean record does.

How to answer

  • Describe the shot and what went wrong, such as short burden in the front row or a mud seam
  • Say what you did right away to secure the area and report it
  • Explain what you changed afterward, like profiling the face or adjusting front row loads
  • Show that you own the result instead of blaming the driller
5.Electronic detonators, shock tube or electric caps: what have you tied in, and what do you prefer?

Why they ask

Crews run different systems, and they want to know how much training you'll need.

How to answer

  • Name the systems you've actually used and on what kind of shots
  • Describe testing an electronic or electric circuit before firing and what you check for
  • Give an honest preference with a reason, such as precise timing near homes
  • Say you're comfortable learning their system from the manufacturer's rep

Part 2

6.What goes in your blast log, and why does it matter?

Why they ask

The log is the legal record. A sloppy one can sink the company if something goes wrong.

How to answer

  • List the basics: location, date and time, pattern, hole depths, product per hole and per delay
  • Include stemming, initiation system, delay timing and weather
  • Add seismograph locations and readings, and any misfires
  • Explain that you fill it in at the site, not from memory at the end of the week
7.How do you handle magazine inventory and product on the truck?

Why they ask

Lost explosives are a federal problem. They need someone who counts every time.

How to answer

  • Describe checking product in and out of the magazine against the daily record
  • Keep detonators and bulk product separated as the rules require
  • Return unused product the same day and reconcile the count
  • Report any discrepancy immediately instead of trying to fix it quietly
8.A foreman is pushing you to fire before lunch, but a storm is building. What do you do?

Why they ask

The blaster is the one person who can stop the job. They want proof you'll use that authority.

How to answer

  • Say plainly that lightning near a loaded shot means clearing the area, not rushing
  • Explain how you'd use a lightning detector or weather check
  • Describe telling the foreman the reason and the new plan calmly
  • Show you'd hold that line even if it costs the schedule
9.What does your license cover, and what's current on your clearance and training?

Why they ask

They can't put you on a shot without it, and license classes differ by state.

How to answer

  • Name the state and class of your license and what work it allows
  • Confirm your employee possessor status and who holds it
  • State your mine safety training and refresher status if the job is at a mine
  • Mention a hazmat endorsement on your CDL if you have one
10.Tell me about a time you disagreed with a driller or a supervisor about a shot.

Why they ask

Drillers and blasters depend on each other. They want to see you can argue about a pattern without starting a feud.

How to answer

  • Set up the real disagreement, like holes drilled off pattern or a rushed schedule
  • Explain how you raised it with facts from the drill log or the face
  • Describe how you reached a decision and who made the final call
  • Say what happened on the shot and what you learned

Part 3

11.Why do you want to work for a drill and blast contractor rather than stay at one quarry, or the other way around?

Why they ask

Contract work means travel and new rock every week. A quarry means the same bench for years. They want you to know what you're signing up for.

How to answer

  • Show you understand the difference in schedule and travel
  • Tie it to something concrete you want, such as variety of shots or a steady home life
  • Mention what you've already done that fits their setup

Questions to ask them

Ask at least two. It shows you're picking them too.

  • What initiation systems and bulk products do your crews run, and who's the supplier rep I'd work with?
  • How close are your typical shots to homes or other structures, and who handles neighbor complaints?
  • Who does the drilling, and how do blasters and drillers settle pattern problems here?
  • Will you support my next license class or a hazmat endorsement if I don't have it yet?
  • What does a normal week look like for travel and overnight stays?

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