Pro practiceMineral Processing Engineer practice interview
Plant performance, mass balance, recovery and product quality, bottleneck diagnosis and controlled process improvement. Practise the 6 questions interviewers ask for this role with follow-ups. Paid plans add scored feedback on every answer.
A Pro practice interview, on the Pro plan from ₦5,000 a month billed yearly, or on Premium.
- Mid level
- 20 minutes
- 6 questions
- Scored feedback on paid plans
About the role
This interview tests whether you can understand a processing circuit as a connected system rather than a set of isolated machines. The panel will look for reliable metallurgical accounting, structured troubleshooting and safe control of plant changes. Good answers connect ore variability and operating conditions to throughput, recovery, product quality and losses.
How to prepare
- Review the major unit operations in the relevant commodity circuit and the variables that control them.
- Practise building and checking a mass balance from plant measurements and assays.
- Prepare an example of a bottleneck or recovery loss you investigated using operating data and sampling.
- Revise how you design a controlled plant trial and decide whether a change should be retained.
- Think through safe shutdown and restart decisions after power, water or equipment interruptions.
Common mistakes
- Recommending set-point changes before confirming that measurements and samples are reliable.
- Treating recovery, grade and throughput as independent targets with no trade-offs.
- Running an uncontrolled plant trial that cannot separate the effect of the change from ore variability.
- Ignoring safe isolation, stored energy or chemical hazards during troubleshooting.
What to expect
A real first-round interview
6 questions the way interviewers ask for this role, with follow-ups when an answer needs more.
Spoken, like the real thing
Speak your answers in your browser or the free desktop app, with live captions. You can ask the interviewer to repeat anything.
Scored on 5 areas
The things this interview weighs most. With a paid plan, your report shows how you did on each one.
A private report
On Plus, Pro and Premium: every answer scored, your strongest lines quoted and what to say differently next time. Interview creators never see it.
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