Announcement PDF Appendix 3Y Change of Director’s Interest Notice Rule 3.19A.2 Appendix 3Y Change of Director’s Interest Notice Information or documents not available now must be given to ASX as soon as available. Information and documents given to ASX become ASX’s property and may be made public. Introduced 30/09/01 Amended 01/01/11 Name of entity West Coast Silver Limited (previously Errawarra Resources Ltd) ABN 95 155 472 834 We (the entity) give ASX the following information under listing rule 3.19A.2 and as agent for the director for the purposes of section 205G of the Corporations Act. Name of Director Thomas Reddicliffe Date of last notice 21 May 2025 Part 1 - Change of director’s relevant interests in securities In the case of a trust, this includes interests in the trust made available by the responsible entity of the trust Note: In the case of a company, interests which come within paragraph (i) of the definition of “notifiable interest of a director” should be disclosed in this part. Direct or indirect interest (a) Direct (b) Indirect Nature of indirect interest (including registered holder) (b) Thomas Reddicliffe <Tredex Trust A/C> Mr Reddicliffe is a trustee and beneficiary of the trust Note: Provide details of the circumstances giving rise to the relevant interest. Date of change No. of securities held prior to change 26 September 2025 Interest (a) (b) Shares 315,185 – Options 1,750,000 400,000 PR^ 1,000,000 – Options 1,250,000 400,000 PR^ 1,000,000 – ^ PR = Performance rights Class (a) Options Number acquired N/A Number disposed (a) 500,000 Value/Consideration N/A Note: If consideration is non-cash, provide details and estimated valuation No. of securities held after change Interest (a) (b) Shares 315,185 – ^ PR = Performance rights Nature of change Example: on-market trade, off-market trade, exercise of options, issue of securities under dividend reinvestment plan, participation in buy-back + See chapter 19 for defined terms. 01/01/2011 Expiry of unlisted options exercisable at $0.25 each on or before 25 September 2025. Appendix 3Y Page 1 Appendix 3Y Change of Director’s Interest Notice Part 2 – Change of director’s interests in contracts Note: In the case of a company, interests which come within paragraph (ii) of the definition of “notifiable interest of a director” should be disclosed in this part. Detail of contract Nature of interest Name of registered holder (if issued securities) Date of change No. and class of securities to which interest related prior to change Note: Details are only required for a contract in relation to which the interest has changed Interest acquired Interest disposed Value/Consideration Note: If consideration is non-cash, provide details and an estimated valuation Interest after change Part 3 – +Closed period Were the interests in the securities or contracts detailed above traded during a +closed period where prior written clearance was required? If so, was prior written clearance provided to allow the trade to proceed during this period? No If prior written clearance was provided, on what date was this provided? N/A Date: N/A 26 September 2025 + See chapter 19 for defined terms. Appendix 3Y Page 2 01/01/2011