South32 Ltd. · ASX:S32
South32 — Corporate Update (November 2025)
37 slides from South32's corporate update, Nov 18, 2025
Slide 1: South32 Worsley Alumina Mine CLC Meeting
SOUTH32 WORSLEY ALUMINA MINE CLC MEETING 18 November 2025
Slide 2: Agenda
AGENDA Item Description Presenter 1 Open meeting and note apologies G Cavanagh 2 Acknowledgement of Country South32 Read and accept previous minutes 3 Review actions and responses G Cavanagh Acknowledge receipt of questions – 18 November Worsley Business Update • South32 Update • Boddington Bauxite
Slide 3: Acknowledgment of Country
Acknowledgment of Country I would like to acknowledge the Wilman people of the Noongar nation who are the Traditional Custodians of this land we meet on today. I would also like to pay my respect to all Elders past, present and emerging. 3
Slide 4: Worsley Business Update
WORSLEY BUSINESS UPDATE Quarterly Report September 2025 o Production highlights included a 12 per cent increase in payable copper equivalent production at Sierra Gorda and a 33 per cent uplift in manganese volumes, as we successfully executed the operational recovery plan at Australia Manganese. o A
Slide 5: Worsley Business Update
WORSLEY BUSINESS UPDATE Boddington CLC Meeting SLIDE 5
Slide 6: Operational Update
OPERATIONAL UPDATE
Slide 7: Operational Update
OPERATIONAL UPDATE o Production for the quarter progressed well – tracking above forecast for the period o Drilling exceeded forecast (metres drilled) and blasting activities exceeded budget (holes blasted). o Challenges throughout the quarter with grade, reactive silica levels and oxalate levels, p
Slide 8: Operational Update – Projects
OPERATIONAL UPDATE – PROJECTS Lower Hotham Road The works outlined below are currently scheduled to be completed by 15/01/2026. General Freight deliveries: coming from Perth over the next 2-3 weeks. Loads expected are single semi-trailers with minimal materials. Water Deliveries: > 6 Semi loads
Slide 9: Operational Update – Projects
OPERATIONAL UPDATE – PROJECTS • Newmont • - Low to no impact expected for neighbours in surrounding areas. • - Closest neighbour to current activities is 8.9km from the work front. • - Accommodating workers in the Newmont camp from 15th September. Approx 60 currently, not anticipating this to increa
Slide 10: HoN Mine Development
HON MINE DEVELOPMENT • The Hotham North Mine Development (HoN ) is a Life Extension project forming part of the Worsley Life of Operations Plan (LoOP) and is within the current Part IV Environmental Approval (MS1237). • The extension is business sustaining and not linked to a production increase, wi
Slide 11: HoN Ore Transport: Crusher & Conveyor
HON ORE TRANSPORT: CRUSHER & CONVEYOR • As part of the pre-feasibility study, a Crusher and Conveyor was endorsed as the preferred method of materials handling infrastructure • The OLC Conveyor is a single flight Conveyor, 14km in length (Similar to the existing Marradong OLC) • The OLC Conveyor wil
Slide 12: Environment Update
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Slide 13: Environment – Dust Deep Dive
ENVIRONMENT – DUST DEEP DIVE • BBM Licence - L5960/1983/11 Boddington CLC Meeting SLIDE 13
Slide 14: Dust Results
DUST RESULTS Dust logger feed into EQUiS - Alerts are generated for exceedances - Data is verified and validated by Benchmark - Daily reports Boddington CLC Meeting SLIDE 14
Slide 15: Update: Respirable Crystalline Silica (RCS) Exposure Trends
UPDATE: RESPIRABLE CRYSTALLINE SILICA (RCS) EXPOSURE TRENDS Notes: • This is an update of data shared at the August 2024 CLC. • RCS samples collected from 45 different workgroups (grouped into 8 SEGs) across BBM and the OBC. • All SEGS are currently below 8% of the RSC Occupational Exposure Level (O
Slide 16: Airborne BBM Dust Analysis by Occupational Hygienist
AIRBORNE BBM DUST ANALYSIS BY OCCUPATIONAL HYGIENIST • Data Sources: ⎯ BBM Dust Sampling and Analysis Report 2021 – GHD Group > 15 samples collected from Air Sampler adjacent to Crusher Building over a 3-month period in 2021 ⎯ Bauxite Ore Trace Elements Report - South32 Worsley Alumina Process Labor
Slide 17: Summary of Hygiene Dust Analysis Results
SUMMARY OF HYGIENE DUST ANALYSIS RESULTS Maximum Results VS. DWER Maximum results VS. Maximum Results VS. Average Results Maximum Results Maximum Results VS. SWA Constituent Ambient Air Quality Australian Freshwater Quality Australian/WHO Drinking (ug/m3) (ug/m3) Workplace Exposure Limits Guidelines
Slide 18: Conclusions
CONCLUSIONS • Three elements had maximum dust concentrations greater than 50% of the DWER Ambient Air Quality Guidelines: Aluminium, Manganese, and total PM10 particulates. ⎯ Aluminium is extremely abundant in the earth’s crust and has very low toxicity. Therefore, no health-based guideline value ha
Slide 19: Hygienist's Rainwater Harvesting Recommendations
HYGIENIST’S RAINWATER HARVESTING RECOMMENDATIONS • Rainwater is usually safe to drink unless it has been contaminated or stored improperly. ⎯ Worsley’s Occupational Hygienist shared information about keeping rainwater collection systems clean and safe. Refer to: https://www.healthywa.wa.gov.au/Artic
Slide 20: Environment – Orchid Update
ENVIRONMENT – ORCHID UPDATE Boddington CLC Meeting SLIDE 20
Slide 21: Aluminium Stewardship Initiative
ALUMINIUM STEWARDSHIP INITIATIVE • BIODIVERSITY & ECOSYSTEM SERVICES ASI Performance Standard: 8.1 a & b The entity shall: • a. Assess the risk to and potential impacts on Biodiversity & Ecosystem Services • b. Undertake a systematic review, in consultation with and with the participation of Affecte
Slide 22: Aluminium Stewardship Initiative
ALUMINIUM STEWARDSHIP INITIATIVE • Affected Populations ASI Performance Standard: 9.1c • A mapping of Affected Populations and Organisations to ensure Affected Populations and Organisations are: ⎯ I. Engaged by the Entity ⎯ II. Consulted about operational activities and potential significant Human R
Slide 23: Aluminium Stewardship Initiative
ALUMINIUM STEWARDSHIP INITIATIVE • Phase 1 – Project Initiation & Knowledge Gap Assessment • Phase 2 – Baseline Assessment • Phase 3 – Stakeholder Engagement • The purpose of this phase is to identify and validate PES through structured engagement with affected communities. Engagement will build on
Slide 24: Community Update
COMMUNITY UPDATE , YW
Slide 25: Community Update
COMMUNITY UPDATE • COMMUNITY COMPLAINTS - OPT IN FOR NOTIFICATIONS - Advertisement in Boddington News October edition inviting community members who want to opt-in to receive community 15 complaints FY26 - July/August 2025 • notifications via text or email. 15 complaints related to BBM: o 3 x Dust o
Slide 26: Community Investment
COMMUNITY INVESTMENT o Shire of Boddington 2025 Boddington Careers Expo o Boddington District High School - Faction Athletics Day - RUOk Day o BBM Rehabilitation Tours o Boddington Golf Club Men’s Open o Boddington Lion's Rodeo o Peel District Cycling Club SLIDE 26
Slide 27: Community Update
COMMUNITY UPDATE • Local Voices Pulse Survey has now closed. • Survey advertising was promoted in the Boddington News, SouthWest Times, Collie News Bulletin, and social media. Boddington CLC Meeting SLIDE 27
Slide 28: Local Voices – Preliminary Data
LOCAL VOICES – PRELIMINARY DATA N = 712 N = 272 N = 265 Boddington CLC Meeting SLIDE 28
Slide 29: Local Voices – Preliminary Data
LOCAL VOICES – PRELIMINARY DATA N = 39 Boddington CLC Meeting SLIDE 29
Slide 30: Local Voices – Preliminary Results
LOCAL VOICES – PRELIMINARY RESULTS Boddington CLC Meeting SLIDE 30
Slide 31: Local Voices – Preliminary Results
LOCAL VOICES – PRELIMINARY RESULTS Boddington CLC Meeting SLIDE 31
Slide 32: Local Voices – Preliminary Results
LOCAL VOICES – PRELIMINARY RESULTS Boddington CLC Meeting SLIDE 32
Slide 33: Local Voices – Preliminary Results
LOCAL VOICES – PRELIMINARY RESULTS Boddington CLC Meeting SLIDE 33
Slide 34: Local Voices – Preliminary Data
LOCAL VOICES – PRELIMINARY DATA Boddington CLC Meeting SLIDE 34
Slide 35: Local Voices – Preliminary Data
LOCAL VOICES – PRELIMINARY DATA Boddington CLC Meeting SLIDE 35
Slide 36: Community – CLC Profiling
COMMUNITY – CLC PROFILING Why o Sharing who the members are demonstrates openness and accountability. o It shows the committee is made up of real, local people who represent community interests rather than being a “closed group.” o Public profiles help validate that members have relevant experience
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