Heavy Engineering & Wear Parts: composite SAG liners in practice for mill teams
Reviewed by Joe Ashwell
First reported on International Mining – News
30 Second Briefing
ME PolyFIT® composite feed head liners are extending wear life on a 34 ft (10.4 m) SAG mill at an open-pit copper-molybdenum mine in Britain, directly supporting higher mill uptime and reduced liner change frequency. The engineered liner system replaces conventional steel designs in the feed end, targeting high-impact zones where premature failure typically drives unplanned shutdowns. For mine maintenance and process teams, the case points to composite liner retrofits as a route to longer inspection intervals and more stable grinding performance without major mill modifications.
Technical Brief
- Composite construction combines steel backings with moulded wear-resistant polymer to absorb high-energy impacts.
- Liner segments are mechanically fastened to existing bolt patterns, avoiding drilling or shell welding.
- Reduced liner mass versus full steel designs lowers handling loads during change-out and crane utilisation.
- Modular liner segments allow selective replacement of highest-wear panels instead of full feed-end relines.
- Lower noise levels around the mill are reported due to the damping behaviour of the composite sections.
Our Take
A 34 ft (10.4 m) SAG mill sits at the larger end of what our database shows for greenfield copper–molybdenum concentrators, signalling that the wear-part strategies discussed here are likely aimed at very high-throughput, low- to mid-grade ore bodies where liner life and changeout planning materially affect unit costs.
With International Mining also involved in convening senior decision-makers at the World Mining Congress 2026 in Peru, insights from this UK-based heavy engineering feature are likely to feed into global discussions on standardising large-SAG-mill designs and liner specifications for next-generation copper projects.
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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