Investor Presentaiton

2025 Tailings and Site Water 29Metals is pursuing multiple levers to maintain tailings capacity to a planned life of mine Tailings Storage Facility ("TSF 3")1 Tailings Strategy² Tailings Timeline and Overview²,3 29Metals currently has ~6 months of remaining capacity in the existing Esperanza Tailings Storage Facility ("ETSF") Intention to move to TSF 3 in the medium term: Progressing options to accelerate to late 2024 / early 2025 with regulatory approval and long lead procurement the key drivers 1,2 Options to maintain tailings capacity until TSF 3 comes on-line:4 Reducing production rates and increased utilisation of tailings in paste fill Potential to return to deposition of tailings in the Esperanza Pit ("EPit") (~9 months tailings capacity) Lift of ETSF (Lift 2), subject to ongoing regulatory approval process (~6 months tailings capacity) Constructive engagement with the regulator is ongoing with respect to required approvals and above options Approvals confidence enhanced following Prescribed Project declaration Water Reduction Progressing 2023 Tailings Storage Options H2 H1 ETSF Reducing production rates / increased tailings in paste EPit ETSF Lift 2 TSF 3 Current Capacity 2024 H2 H1 12 Approval pending for increased wet season discharge if required 18 installed evaporators progressing stored water reduction H2 12 Accelerated Operation 1. 2. TSF 3 is expected to have initial capacity for approximately 6 years of operations, with potential to expand tailings deposition capacity with further regulatory approvals. Refer to important information at the beginning of this presentation regarding forward looking statements. 3. 4. Timeline is for indicative purposes only and is subject to assumptions with regard to production rates, paste utilisation, wet season weather conditions and regulatory approvals. Refer to risk factors in this presentation regarding risks associated with regulatory approvals. Subject to regulatory approvals. 29 M 12

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