Announcement PDF 605 GUIDE page 1/2 28th August 2025 Form 605 Corporations Act 2001 Section 671B Notice of ceasing to be a substantial holder To: Company Name/Scheme WEST COAST SILVER LIMITED ACN/ARSN 155 472 834 1. Details of substantial holder (1) Name ACN/ARSN (if applicable) Mr Jason Peterson N/A The holder ceased to be a substantial holder on The previous notice was given to the company on previous notice was dated The 28 28 28 / / / 08 05 05 / / / 2025 2025 2025 2. Changes in relevant interest Particulars of each change in, or change in nature of, a relevant interest (2) of the substantial holder or an associate (3) in voting securities of the company or scheme, since the substantial holder was last required to give a substantial holding notice to the company or scheme are as follows: Date of change Person whose relevant interest changed Nature of change (4) 28/08/2025 Celtic Finance Corp Pty Ltd Ceased to be substantial shareholder following dilution due to Share Issue 28/08/2025 Celtic Finance Corp Pty Ltd <Income A/C> Ceased to be substantial shareholder following dilution due to Share Issue 28/08/2025 CPS Capital No 5 Pty Ltd Ceased to be substantial shareholder following dilution due to Share Issue 28/08/2025 Fat Hog Pty Ltd Ceased to be substantial shareholder following dilution due to Share Issue 28/08/2025 Celtic Capital Pty Ltd <Celtic Capital No 2 A/C> Ceased to be substantial shareholder following dilution due to Share Issue 28/08/2025 Celtic Capital Foundation Pty Ltd <Celtic Foundation A/C> Ceased to be substantial shareholder following dilution due to Share Issue 28/08/2025 Sunset Capital Management Pty Ltd <Sunset Superfund A/C> Ceased to be substantial shareholder following dilution due to Share Issue Consideration given in relation to changes (5) Class (6) and number of securities affected Person’s votes affected 3. Changes in association The persons who have become associates (3) of, ceased to be associates of, or have changed the nature of their association (7), with, the substantial holder in relation to voting interests in the company or scheme are as follows: Name and ACN/ARSN (if applicable) Nature of association Celtic Finance Corp Pty Ltd Director Celtic Finance Corp Pty Ltd <Income A/C> Director CPS Capital No 5 Pty Ltd Director Fat Hog Pty Ltd Director Celtic Capital Pty Ltd <Celtic Capital No 2 A/C> Director Celtic Capital Foundation Pty Ltd <Celtic Foundation A/C> Director Sunset Capital Management Pty Ltd <Sunset Superfund A/C> Director/Trustee 605 GUIDE page 2/2 28th August 2025 4. Addresses The addresses of persons named in this form are as follows: Name Address Celtic Finance Corp Pty Ltd PO Box Z5467, St Georges Terrace, PERTH WA 6831 Celtic Finance Corp Pty Ltd <Income A/C> PO Box Z5467, St Georges Terrace, PERTH WA 6831 CPS Capital No 5 Pty Ltd PO Box Z5467, St Georges Terrace, PERTH WA 6831 Fat Hog Pty Ltd PO Box Z5467, St Georges Terrace, PERTH WA 6831 Celtic Capital Pty Ltd <Celtic Capital No 2 A/C> PO Box Z5467, St Georges Terrace, PERTH WA 6831 Celtic Capital Foundation Pty Ltd <Celtic Foundation A/C> PO Box Z5467, St Georges Terrace, PERTH WA 6831 Sunset Capital Management Pty Ltd <Sunset Superfund A/C> PO Box Z5467, St Georges Terrace, PERTH WA 6831 Signature print name sign here Mr Jason Peterson capacity Director date 28 / 08 / 2025