KPIs & Benchmarks

Aggregate and Bulk Handling KPIs: Benchmark Ranges and How to Hit Them

The KPIs that actually move a crushing and screening plant, with world-class versus typical benchmark ranges and the specific levers that close the gap.

Mechanical availability is the headline KPI: run time divided by scheduled time. World-class fixed plants sustain 90 to 95 percent; typical operations sit at 78 to 85 percent, and portable spreads often live below 75 percent. The gap is usually unplanned crusher and conveyor stops. Track mean time between failures and mean time to repair separately, because a plant at 85 percent availability with 20 short stops per shift has a different fix (feed control, blockages) than one with 2 long stops (component reliability). Chasing availability past 92 percent almost always means solving conveyor and chute plugging first.

Overall throughput utilization compares actual tons per productive hour against demonstrated plant capacity. A plant capable of 500 t/h that averages 380 t/h runs 76 percent utilization; world-class is 88 to 94 percent. The common thief is starving and surging: an unlevel feed swinging between 300 and 600 t/h averages low and trips overloads. A variable-speed feeder holding within plus or minus 5 percent of target lifts utilization several points. Confirm the ceiling with Crusher Throughput and Conveyor Capacity so you benchmark against real capacity, not an optimistic nameplate.

Screen efficiency benchmarks at 90 to 95 percent for a well-set single deck and 85 to 92 percent for stacked decks; below 80 percent you are sending saleable product to the wrong pile. Measure it by sieving feed, oversize, and product streams, not by eye. The levers are stroke and speed matched to aperture, correct deck angle (usually 18 to 25 degrees for inclined), bed depth under 4 times aperture at discharge, and controlling near-size and moisture. Wet sticky sub-3 percent moisture feed blinds panels fast; a spray bar or heated deck can recover 5 to 10 points.

Yield, the saleable fraction of feed, is the KPI that pays. Good hard-rock plants convert 88 to 94 percent of feed to saleable product; poorly balanced circuits drop to 70 to 80 percent as excess fines. Benchmark each product size against its market demand, not just total yield, because making 96 percent yield of a size nobody buys is worse than 85 percent of the right split. Adjust crusher setting, add a tertiary stage, or blend to shift the gradation. Aggregate Yield quantifies the split so you can target the crusher setting that maximizes value, not tonnage.

Energy per ton benchmarks by product coarseness. Primary and secondary crushing to coarse aggregate runs 0.5 to 1.5 kWh/t; full circuits producing manufactured sand reach 3 to 6 kWh/t. World-class plants track kWh per saleable ton and trend it, because a rising number signals dull wear parts or a tightening feed before it shows in production. The levers are keeping crushers choke-fed, staging reduction so no single machine takes too high a ratio, and pulling out fines early so you do not re-crush material that is already at size.

Bulk density and load accuracy underpin every silo and truck KPI. A silo run at 92 percent of geometric capacity versus a target 95 percent, or trucks loaded to 96 percent of legal payload versus 99 percent, quietly cost throughput and freight efficiency. World-class loadout hits within 1 percent of target payload. The lever is consistent measured density: use Bulk Density Conversion and Silo Capacity to reconcile geometric volume against actual weighed mass, and recalibrate when material or moisture changes, because a 5 percent density drift silently misreports inventory by hundreds of tons.

Conveyor and transport KPIs center on loading and belt utilization. Belts running at 60 to 70 percent of rated cross-sectional load waste capital and energy; well-balanced systems sit at 80 to 90 percent, leaving surge headroom. Spillage and carryback below 0.1 percent of throughput is world-class; poorly maintained systems lose 0.5 percent or more to spillage and cleanup labor. Use Belt Load to verify running mass against idler and drive ratings, and set the feed rate so the belt sits in the efficient band without tripping on surges.

Blending and homogeneity matter wherever spec consistency is sold. For blended products, coefficient of variation of the key parameter should sit under 3 to 5 percent for a good bed-blending or in-line system, versus 8 to 12 percent for naive stockpiling. Measure it by sampling the discharge stream over a run and computing standard deviation over mean. Blending Time helps size the mix cycle to hit the target CV. The improvement levers are more layers in a chevron stack, reclaim across the full bed face, and steady feed, all of which trade a little time for tighter, saleable consistency.

Published 2026-07-01.