Interpretation

Sector lens, proxy boundaries and caveats

Sector-relevant interpretation

The same 15 metrics are applied across all companies, but interpreted through a sector-relevant lens.

Marine dredging

Water and habitat metrics are interpreted through turbidity, seabed disturbance, dredged sediment, vessel emissions and marine permitting.

Construction materials

Emphasis on quarrying, aggregates, water, biodiversity, rehabilitation and circular materials.

Mining, potash and lithium

Emphasis on land disturbance, water, mineral residue / tailings, rehabilitation, closure planning and value-chain emissions.

Proxy and boundary notes

Where company-specific marine-asset data is unavailable, group-level or parent-company evidence is used as a proxy and is labelled as such. Proxy data is not presented as direct subsidiary-level performance.

Brett Aggregates data is used as Brett-level evidence for the wider Brett marine aggregates context. Britannia Aggregates and Volker Dredging do not appear to publish standalone sustainability disclosures.

Boskalis Group disclosure is used as group-level proxy evidence for Westminster Gravels where Westminster-Gravels-specific sustainability data is unavailable.

Group-level disclosure is used where company-specific marine-asset data is not separately reported.

Benchmark caveat

Scores are based on reviewed public sustainability evidence and are intended for comparative benchmarking. They should not be read as a definitive ESG rating. Higher scores generally indicate stronger quantified disclosure and more mature sustainability systems. Lower scores may reflect limited public disclosure, smaller company scale, proxy reporting boundaries or development-stage assets rather than weaker underlying sustainability performance.