Bulk Solids, Mining, Aggregates & Material Processing worked example

Screening Reject Rate at 99% target screening efficiency: a worked example

This scenario runs the screening reject rate calculation on the strong side: 99% target screening efficiency, with every other input held at its documented default. a plant team is reviewing screening reject rate for bulk solids, mining, aggregates, and material processing and needs a clear screening reject rate for production, quality, capacity, maintenance, purchasing, or costing decisions

The inputs for this scenario

  • On-spec material passing the screen: 850 tons (unchanged)
  • Total screen feed in the same period: 1,000 tons (unchanged)
  • Target screening efficiency: 99 % (raised for this scenario; the documented default is 95)

Working through the calculation

  • Applying the documented formula (Screening Reject Rate = screening reject rate accepted or affected material ÷ total screen feed, oversize, undersize, fines, or saleable aggregate in same period × 100) to the inputs above produces each figure below.
  • At this operating point the engine returns 85 % for screening reject rate, the number this scenario is built around.
  • At this operating point the engine returns 14 points for screening reject rate gap to target.
  • At this operating point the engine returns 850 count for screening reject rate accepted or affected material.
  • At this operating point the engine returns 1,000 count for total screen feed, oversize, undersize, fines, or saleable aggregate in same period.

How this compares with the baseline

  • Against the tool's baseline example, where target screening efficiency sits at 95% and the headline result is 85 %, this scenario lands almost exactly on the baseline at 85 %.
  • Use it during screen audits, after media changes, or when product gradation drifts and you need to quantify deck performance. Treat this as a target state: the delta against the baseline quantifies what the improvement is worth before you commit to chasing it.

Results at a glance

  • Screening Reject Rate: 85 % (headline result)
  • Screening Reject Rate gap to target: 14 points
  • Screening Reject Rate accepted or affected material: 850 count
  • Total screen feed, oversize, undersize, fines, or saleable aggregate in same period: 1,000 count

Run it with your numbers

  • Every input above is editable in the live Screening Reject Rate calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.