Industrial Minerals & Powder Processing worked example

Particle Size Yield at 65% target yield rate: a worked example in industrial minerals & powder processing

Here is what the math looks like when conditions slip. We hold every other input steady and drop target yield rate to 65%, then walk the calculation through step by step. Calculate the percentage of milled mineral product that falls within the target particle size specification after screening or air classification.

The inputs for this scenario

On-spec product tonnage: 72 tons (held at the documented default)
Total production tonnage: 85 tons (held at the documented default)
Target yield rate: 65 % (the input this scenario stresses; the baseline uses 90)

Working through the calculation

The calculation starts from the formula this tool documents: Particle size yield = on-spec product tonnage / total production tonnage x 100.
Particle size yield works out to 84.71 % at these inputs, and this is the headline figure for the scenario.
Gap to target yield works out to -19.71 pp at these inputs.
On-spec product tonnage works out to 72 tons at these inputs.
Total production tonnage works out to 85 tons at these inputs.

How this compares with the baseline

Against the tool's baseline example, where target yield rate sits at 90% and the headline result is 84.71 %, this scenario lands almost exactly on the baseline at 84.71 %.
The practical read: the gap between this scenario and the baseline is entirely attributable to target yield rate, so recovering it is worth quantifying in dollars before considering equipment or staffing changes. It treats all on-spec tonnage as equal; it does not tell you whether you are failing on the oversize tail, the fines, or both, so confirm with a full sieve or laser-diffraction analysis.

Results at a glance

Particle size yield: 84.71 % (headline result)
Gap to target yield: -19.71 pp
On-spec product tonnage: 72 tons
Total production tonnage: 85 tons

Run it with your numbers

To rerun this with your own numbers, open the live Particle Size Yield calculator, set target yield rate to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.