SRK Consulting and TOMRA Mining pebble sorting: energy and throughput insights for mills
Reviewed by Tom Sullivan

First reported on International Mining – News
30 Second Briefing
Pebble recirculation, which can account for up to 30% of mill feed and significantly raise energy use, is being re‑examined by SRK Consulting and TOMRA Mining through sensor‑based ore sorting of the pebble stream. By treating pebbles as a heterogeneous feed and diverting barren or low-value fragments via TOMRA’s sorting units, operations can cut unnecessary regrinding and reduce circulating loads. The approach targets higher throughput and lower specific energy consumption in SAG and AG circuits without major changes to existing comminution layouts.
Technical Brief
- Pebble recirculation is standard practice in mining operations, even though it is a costly, energy-intensive and potentially plant performance-limiting process.
- In some operations, pebbles can represent up to 30% of the mill feed, increasing complexity and reducing efficiency.
Our Take
With pebbles accounting for up to 30% of mill feed, integrating TOMRA Mining’s sensor-based sorting—already being used to upgrade mineralised material at Soma Gold’s El Bagre mine—suggests a route to turn what is often a grinding bottleneck into a pre-concentration stage that can lift overall plant throughput.
SRK Consulting’s recent work on using sensor-based sorting to convert waste rock and tailings into construction aggregate indicates that similar thinking around pebble streams could support mine backfill and infrastructure materials strategies, not just energy savings in comminution.
Prepared by collating external sources, AI-assisted tools, and Geomechanics.io’s proprietary mining database, then reviewed for technical accuracy & edited by our geotechnical team.
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