Disclosure relating to Boliden's compliance with GISTM

In addition to following the Global Industry Standard on Tailings Management (GISTM) developed by ICMM, UNEP and PRI, Boliden also follows the SASB-standard (EM-MM-540a.1-3) as well as national standards such as the Swedish GruvRIDAS. To comply with all the above, Boliden is obliged to make information on each tailings facility under its control publicly available. Depending on each tailings facility’s consequence classification, the extent of this information may vary.

Boliden is fully committed to implement the GISTM standard and as part of this commitment has published on 5 August 2025 an update of the conformance level for all its tailings facilities. Boliden has achieved full conformance for its extreme and very high consequence facilities, as well as for all the active facilities with a high consequence. For the inactive facilities, the current status is partial conformance as further work is required at these facilities to achieve safe closure as defined in GISTM.