Announcement PDF 29 September 2026 Appendix 4G & Corporate Governance Statement The Board of Castle Minerals Limited (ASX: CDT) (“Castle” or the “Company”) is responsible for the corporate governance of the Company and its subsidiaries and has implemented policies, procedures and systems of control to provide a strong framework and practical means for ensuring good governance outcomes which meet the expectations of all stakeholders. The Company’s Board is committed to upholding a high standard of corporate governance practices, ensuring that the Company complies with the Corporations Act 2001 (Cth), the ASX Listing Rules, the Company Constitution, and other applicable laws and regulations. This Corporate Governance Statement discloses the extent to which the Company has followed the recommendations set out by the ASX Corporate Governance Council (“Recommendations”) in its publication Corporate Governance Principles and Recommendations 4th Edition, and best practice. The Recommendations are not mandatory; however, where the Company has departed from a Recommendation, the Board has offered full disclosure and reason for adoption of its own practice. The Board approved this Company’s Governance Statement on 29 September 2026. The Company’s Board has also reviewed the Company’s Corporate Governance Plan, which outlines the terms of reference for the Company’s corporate governance responsibilities. The Company’s Corporate Governance Plan and other corporate governance policies and available on the Company’s website at www.castleminerals.com/governance.php. Please find attached an Appendix 4G ‘Key to Disclosures Corporate Governance Council Principles and Recommendations’ and the Corporate Governance Statement. By the order of the Board Jade Styants Company Secretary - END - This announcement was authorised for release to the ASX by the Board of Castle Minerals Limited. For further information please contact: Steve Zaninovich Managing Director enquiries@castleminerals.com Rules 4.7.3 and 4.10.3 ASX Listing Rules Appendix 4G (current at 17/7/2020) Page 1 Appendix 4G Key to Disclosures Corporate Governance Council Principles and Recommendations Name of entity CASTLE MINERALS LIMITED ABN Financial year ended: 83 116 095 802 30 June 2026 Our corporate governance statement1 for the period above can be found at: ☐ These pages of our annual report: ☒ This URL on our website: www.castleminerals.com/governance.php The Corporate Governance Statement is accurate and up to date as at 29 September 2026 and has been approved by the board. The annexure includes a key to where our corporate governance disclosures can be located. Date: 26 September 2026 Name of authorised officer authorising lodgement: Jade Styants Company Secretary 1 “Corporate governance statement” is defined in Listing Rule 19.12 to mean the statement referred to in Listing Rule 4.10.3 which discloses the extent to which an entity has followed the recommendations set by the ASX Corporate Governance Council during a particular reporting period. Listing Rule 4.10.3 requires an entity that is included in the official list as an ASX Listing to include in its annual report either a corporate governance statement that meets the requirements of that rule or the URL of the page on its website where such a statement is located. The corporate governance statement must disclose the extent to which the entity has followed the recommendations set by the ASX Corporate Governance Council during the reporting period. If the entity has not followed a recommendation for any part of the reporting period, its corporate governance statement must separately identify that recommendation and the period during which it was not followed and state its reasons for not following the recommendation and what (if any) alternative governance practices it adopted in lieu of the recommendation during that period. Under Listing Rule 4.7.4, if an entity chooses to include its corporate governance statement on its website rather than in its annual report, it must lodge a copy of the corporate governance statement with ASX at the same time as it lodges its annual report with ASX. The corporate governance statement must be current as at the effective date specified in that statement for the purposes of Listing Rule 4.10.3. Under Listing Rule 4.7.3, an entity must also lodge with ASX a completed Appendix 4G at the same time as it lodges its annual report with ASX. The Appendix 4G serves a dual purpose. It acts as a key designed to assist readers to locate the governance disclosures made by a listed entity under Listing Rule 4.10.3 and under the ASX Corporate Governance Council’s recommendations. It also acts as a verification tool for listed entities to confirm that they have met the disclosure requirements of Listing Rule 4.10.3. The Appendix 4G is not a substitute for, and is not to be confused with, the entity's corporate governance statement. They serve different purposes and an entity must produce each of them separately. Page 2 ANNEXURE – KEY TO CORPORATE GOVERNANCE DISCLOSURES Corporate Governance Council recommendation Where a box below is ticked,2 we have followed the recommendation in full for the whole of the period above. We have disclosed this in our Corporate Governance Statement: Where a box below is ticked, we have NOT followed the recommendation in full for the whole of the period above. Our reasons for not doing so are:3 PRINCIPLE 1 – LAY SOLID FOUNDATIONS FOR MANAGEMENT AND OVERSIGHT 1.1 A listed entity should have and disclose a board charter setting out: (a) the respective roles and responsibilities of its board and management; and (b) those matters expressly reserved to the board and those delegated to management. ☒ and we have disclosed a copy of our board charter at: www.castleminerals.com/governance.php ☐ set out in our Corporate Governance Statement OR ☐ we are an externally managed entity and this recommendation is therefore not applicable 1.2 A listed entity should: (a) undertake appropriate checks before appointing a director or senior executive or putting someone forward for election as a director; and (b) provide security holders with all material information in its possession relevant to a decision on whether or not to elect or re-elect a director. ☒ and we have disclosed in our Corporate Governance Statement. ☐ set out in our Corporate Governance Statement OR ☐ we are an externally managed entity and this recommendation is therefore not applicable 1.3 A listed entity should have a written agreement with each director and senior executive setting out the terms of their appointment. ☒ and we have disclosed in our Corporate Governance Statement. ☐ set out in our Corporate Governance Statement OR ☐ we are an externally managed entity and this recommendation is therefore not applicable 1.4 The company secretary of a listed entity should be accountable directly to the board, through the chair, on all matters to do with the proper functioning of the board. ☒ and we have disclosed in our Corporate Governance Statement. ☐ set out in our Corporate Governance Statement OR ☐ we are an externally managed entity and this recommendation is therefore not applicable 2 Tick the box in this column only if you have followed the relevant recommendation in full for the whole of the period above. Where the recommendation has a disclosure obligation attached, you must insert the location where that disclosure has been made, where indicated by the line with “insert location” underneath. If the disclosure in question has been made in your corporate governance statement, you need only insert “our corporate governance statement”. If the disclosure has been made in your annual report, you should insert the page number(s) of your annual report (eg “pages 10-12 of our annual report”). If the disclosure has been made on your website, you should insert the URL of the web page where the disclosure has been made or can be accessed (eg “www.entityname.com.au/corporate governance/charters/”). 3 If you have followed all of the Council’s recommendations in full for the whole of the period above, you can, if you wish, delete this column from the form and re-format it. Page 3 Corporate Governance Council recommendation Where a box below is ticked,2 we have followed the recommendation in full for the whole of the period above. We have disclosed this in our Corporate Governance Statement: Where a box below is ticked, we have NOT followed the recommendation in full for the whole of the period above. Our reasons for not doing so are:3 1.5 A listed entity should: (a) have and disclose a diversity policy; (b) through its board or a committee of the board set measurable objectives for achieving gender diversity in the composition of its board, senior executives and workforce generally; and (c) disclose in relation to each reporting period: (1) the measurable objectives set for that period to achieve gender diversity; (2) the entity’s progress towards achieving those objectives; and (3) either: (A) the respective proportions of men and women on the board, in senior executive positions and across the whole workforce (including how the entity has defined “senior executive” for these purposes); or (B) if the entity is a “relevant employer” under the Workplace Gender Equality Act, the entity’s most recent “Gender Equality Indicators”, as defined in and published under that Act. If the entity was in the S&P / ASX 300 Index at the commencement of the reporting period, the measurable objective for achieving gender diversity in the composition of its board should be to have not less than 30% of its directors of each gender within a specified period. ☒ Items (a) and (b) and we have disclosed a copy of our diversity policy at: www.castleminerals.com/governance.php ☒ Item (c) set out in our Corporate Governance Statement why we have not complied with item 1.5(c). OR ☐ we are an externally managed entity and this recommendation is therefore not applicable Page 4 Corporate Governance Council recommendation Where a box below is ticked,2 we have followed the recommendation in full for the whole of the period above. We have disclosed this in our Corporate Governance Statement: Where a box below is ticked, we have NOT followed the recommendation in full for the whole of the period above. Our reasons for not doing so are:3 1.6 A listed entity should: (a) have and disclose a process for periodically evaluating the performance of the board, its committees and individual directors; and (b) disclose for each reporting period whether a performance evaluation has been undertaken in accordance with that process during or in respect of that period. ☒ Item (a) and we have disclosed the evaluation process referred to in paragraph (a) at: www.castleminerals.com/governance.php ☒ Item (b) set out in our Corporate Governance Statement why we have not complied with item 1.6(b). OR ☐ we are an externally managed entity and this recommendation is therefore not applicable 1.7 A listed entity should: (a) have and disclose a process for evaluating the performance of its senior executives at least once every reporting period; and (b) disclose for each reporting period whether a performance evaluation has been undertaken in accordance with that process during or in respect of that period. ☒ Item (a) and we have disclosed the evaluation process referred to in paragraph (a) at: www.castleminerals.com/governance.php ☒ Item (b) set out in our Corporate Governance Statement why we have not complied with item 1.7(b). OR ☐ we are an externally managed entity and this recommendation is therefore not applicable Page 5 Corporate Governance Council recommendation Where a box below is ticked,2 we have followed the recommendation in full for the whole of the period above. We have disclosed this in our Corporate Governance Statement: Where a box below is ticked, we have NOT followed the recommendation in full for the whole of the period above. Our reasons for not doing so are:3 PRINCIPLE 2 - STRUCTURE THE BOARD TO BE EFFECTIVE AND ADD VALUE 2.1 The board of a listed entity should: (a) have a nomination committee which: (1) has at least three members, a majority of whom are independent directors; and (2) is chaired by an independent director, and disclose: (3) the charter of the committee; (4) the members of the committee; and (5) as at the end of each reporting period, the number of times the committee met throughout the period and the individual attendances of the members at those meetings; or (b) if it does not have a nomination committee, disclose that fact and the processes it employs to address board succession issues and to ensure that the board has the appropriate balance of skills, knowledge, experience, independence and diversity to enable it to discharge its duties and responsibilities effectively. ☐ [If the entity complies with paragraph (a):] and we have disclosed a copy of the charter of the committee at: [insert location] and the information referred to in paragraphs (4) and (5) at: [insert location] [If the entity complies with paragraph (b):] and we have disclosed the fact that we do not have a nomination committee and the processes we employ to address board succession issues and to ensure that the board has the appropriate balance of skills, knowledge, experience, independence and diversity to enable it to discharge its duties and responsibilities effectively at: [insert location] ☒ set out in our Corporate Governance Statement OR ☐ we are an externally managed entity and this recommendation is therefore not applicable 2.2 A listed entity should have and disclose a board skills matrix setting out the mix of skills that the board currently has or is looking to achieve in its membership. ☒ and we have disclosed our board skills matrix at: www.castleminerals.com/governance.php ☐ set out in our Corporate Governance Statement OR ☐ we are an externally managed entity and this recommendation is therefore not applicable Page 6 Corporate Governance Council recommendation Where a box below is ticked,2 we have followed the recommendation in full for the whole of the period above. We have disclosed this in our Corporate Governance Statement: Where a box below is ticked, we have NOT followed the recommendation in full for the whole of the period above. Our reasons for not doing so are:3 2.3 A listed entity should disclose: (a) the names of the directors considered by the board to be independent directors; (b) if a director has an interest, position, affiliation or relationship of the type described in Box 2.3 but the board is of the opinion that it does not compromise the independence of the director, the nature of the interest, position or relationship in question and an explanation of why the board is of that opinion; and (c) the length of service of each director. ☒ and we have disclosed the names of the directors considered by the board to be independent directors in our Corporate Governance Statement. and, where applicable, the information referred to in paragraph (b) at Corporate Governance Statement. and the length of service of each director at: 2026 Annual Report. ☐ set out in our Corporate Governance Statement 2.4 A majority of the board of a listed entity should be independent directors. ☒ and set out in our Corporate Governance Statement. ☐ set out in our Corporate Governance Statement OR ☐ we are an externally managed entity and this recommendation is therefore not applicable 2.5 The chair of the board of a listed entity should be an independent director and, in particular, should not be the same person as the CEO of the entity. ☐ and set out in our Corporate Governance Statement. ☒ set out in our Corporate Governance Statement OR ☐ we are an externally managed entity and this recommendation is therefore not applicable 2.6 A listed entity should have a program for inducting new directors and for periodically reviewing whether there is a need for existing directors to undertake professional development to maintain the skills and knowledge needed to perform their role as directors effectively. ☐ ☒ set out in our Corporate Governance Statement OR ☐ we are an externally managed entity and this recommendation is therefore not applicable Page 7 Corporate Governance Council recommendation Where a box below is ticked,2 we have followed the recommendation in full for the whole of the period above. We have disclosed this in our Corporate Governance Statement: Where a box below is ticked, we have NOT followed the recommendation in full for the whole of the period above. Our reasons for not doing so are:3 PRINCIPLE 3 – INSTIL A CULTURE OF ACTING LAWFULLY, ETHICALLY AND RESPONSIBLY 3.1 A listed entity should articulate and disclose its values. ☒ and we have disclosed our values at: www.castleminerals.com/governance.php ☐ set out in our Corporate Governance Statement 3.2 A listed entity should: (a) have and disclose a code of conduct for its directors, senior executives and employees; and (b) ensure that the board or a committee of the board is informed of any material breaches of that code. ☒ and we have disclosed our code of conduct at: www.castleminerals.com/governance.php ☐ set out in our Corporate Governance Statement 3.3 A listed entity should: (a) have and disclose a whistleblower policy; and (b) ensure that the board or a committee of the board is informed of any material incidents reported under that policy. ☒ and we have disclosed our whistleblower policy at: www.castleminerals.com/governance.php ☐ set out in our Corporate Governance Statement 3.4 A listed entity should: (a) have and disclose an anti-bribery and corruption policy; and (b) ensure that the board or committee of the board is informed of any material breaches of that policy. ☒ and we have disclosed our anti-bribery and corruption policy at: www.castleminerals.com/governance.php ☐ set out in our Corporate Governance Statement Page 8 Corporate Governance Council recommendation Where a box below is ticked,2 we have followed the recommendation in full for the whole of the period above. We have disclosed this in our Corporate Governance Statement: Where a box below is ticked, we have NOT followed the recommendation in full for the whole of the period above. Our reasons for not doing so are:3 PRINCIPLE 4 – SAFEGUARD THE INTEGRITY OF CORPORATE REPORTS 4.1 The board of a listed entity should: (a) have an audit committee which: (1) has at least three members, all of whom are non-executive directors and a majority of whom are independent directors; and (2) is chaired by an independent director, who is not the chair of the board, and disclose: (3) the charter of the committee; (4) the relevant qualifications and experience of the members of the committee; and (5) in relation to each reporting period, the number of times the committee met throughout the period and the individual attendances of the members at those meetings; or (b) if it does not have an audit committee, disclose that fact and the processes it employs that independently verify and safeguard the integrity of its corporate reporting, including the processes for the appointment and removal of the external auditor and the rotation of the audit engagement partner. ☐ [If the entity complies with paragraph (a):] and we have disclosed a copy of the charter of the committee at: ………………………………………………………………… ………….. [insert location] and the information referred to in paragraphs (4) and (5) at: ………………………………………………………………… ………….. [insert location] [If the entity complies with paragraph (b):] and we have disclosed the fact that we do not have an audit committee and the processes we employ that independently verify and safeguard the integrity of our corporate reporting, including the processes for the appointment and removal of the external auditor and the rotation of the audit engagement partner at: ………………………………………………………………… ………….. [insert location] ☒ set out in our Corporate Governance Statement Page 9 Corporate Governance Council recommendation Where a box below is ticked,2 we have followed the recommendation in full for the whole of the period above. We have disclosed this in our Corporate Governance Statement: Where a box below is ticked, we have NOT followed the recommendation in full for the whole of the period above. Our reasons for not doing so are:3 4.2 The board of a listed entity should, before it approves the entity’s financial statements for a financial period, receive from its CEO and CFO a declaration that, in their opinion, the financial records of the entity have been properly maintained and that the financial statements comply with the appropriate accounting standards and give a true and fair view of the financial position and performance of the entity and that the opinion has been formed on the basis of a sound system of risk management and internal control which is operating effectively. ☒ as we have disclosed in our Corporate Governance Statement. ☐ set out in our Corporate Governance Statement 4.3 A listed entity should disclose its process to verify the integrity of any periodic corporate report it releases to the market that is not audited or reviewed by an external auditor. ☒ as we have disclosed in our Corporate Governance Statement. ☐ set out in our Corporate Governance Statement PRINCIPLE 5 – MAKE TIMELY AND BALANCED DISCLOSURE 5.1 A listed entity should have and disclose a written policy for complying with its continuous disclosure obligations under listing rule 3.1. ☒ and we have disclosed our continuous disclosure compliance policy at: www.castleminerals.com/governance.php ☐ set out in our Corporate Governance Statement 5.2 A listed entity should ensure that its board receives copies of all material market announcements promptly after they have been made. ☒ and we have disclosed in our Corporate Governance Statement. ☐ set out in our Corporate Governance Statement 5.3 A listed entity that gives a new and substantive investor or analyst presentation should release a copy of the presentation materials on the ASX Market Announcements Platform ahead of the presentation. ☒ and we have disclosed in our Corporate Governance Statement. ☐ set out in our Corporate Governance Statement Page 10 Corporate Governance Council recommendation Where a box below is ticked,2 we have followed the recommendation in full for the whole of the period above. We have disclosed this in our Corporate Governance Statement: Where a box below is ticked, we have NOT followed the recommendation in full for the whole of the period above. Our reasons for not doing so are:3 PRINCIPLE 6 – RESPECT THE RIGHTS OF SECURITY HOLDERS 6.1 A listed entity should provide information about itself and its governance to investors via its website. ☒ .and we have disclosed information about us and our governance on our website at: www.castleminerals.com/governance.php ☐ set out in our Corporate Governance Statement 6.2 A listed entity should have an investor relations program that facilitates effective two-way communication with investors. ☒ and we have disclosed in our Corporate Governance Statement. ☐ set out in our Corporate Governance Statement 6.3 A listed entity should disclose how it facilitates and encourages participation at meetings of security holders. ☒ and we have disclosed how we facilitate and encourage participation at meetings of security holders at: www.castleminerals.com/governance.php ☐ set out in our Corporate Governance Statement 6.4 A listed entity should ensure that all substantive resolutions at a meeting of security holders are decided by a poll rather than by a show of hands. ☒ and we have disclosed in our Corporate Governance Statement. ☐ set out in our Corporate Governance Statement 6.5 A listed entity should give security holders the option to receive communications from, and send communications to, the entity and its security registry electronically. ☒ and we have disclosed in our Corporate Governance Statement. ☐ set out in our Corporate Governance Statement Page 11 Corporate Governance Council recommendation Where a box below is ticked,2 we have followed the recommendation in full for the whole of the period above. We have disclosed this in our Corporate Governance Statement: Where a box below is ticked, we have NOT followed the recommendation in full for the whole of the period above. Our reasons for not doing so are:3 PRINCIPLE 7 – RECOGNISE AND MANAGE RISK 7.1 The board of a listed entity should: (a) have a committee or committees to oversee risk, each of which: (1) has at least three members, a majority of whom are independent directors; and (2) is chaired by an independent director, and disclose: (3) the charter of the committee; (4) the members of the committee; and (5) as at the end of each reporting period, the number of times the committee met throughout the period and the individual attendances of the members at those meetings; or (b) if it does not have a risk committee or committees that satisfy (a) above, disclose that fact and the processes it employs for overseeing the entity’s risk management framework. ☐ [If the entity complies with paragraph (a):] and we have disclosed a copy of the charter of the committee at: [insert location] and the information referred to in paragraphs (4) and (5) at: [insert location] [If the entity complies with paragraph (b):] and we have disclosed the fact that we do not have a risk committee or committees that satisfy (a) and the processes we employ for overseeing our risk management framework at: [insert location] ☒ set out in our Corporate Governance Statement. 7.2 The board or a committee of the board should: (a) review the entity’s risk management framework at least annually to satisfy itself that it continues to be sound and that the entity is operating with due regard to the risk appetite set by the board; and (b) disclose, in relation to each reporting period, whether such a review has taken place. ☒ and we have disclosed whether a review of the entity’s risk management framework was undertaken during the reporting period in our Corporate Governance Statement. ☐ set out in our Corporate Governance Statement Page 12 Corporate Governance Council recommendation Where a box below is ticked,2 we have followed the recommendation in full for the whole of the period above. We have disclosed this in our Corporate Governance Statement: Where a box below is ticked, we have NOT followed the recommendation in full for the whole of the period above. Our reasons for not doing so are:3 7.3 A listed entity should disclose: (a) if it has an internal audit function, how the function is structured and what role it performs; or (b) if it does not have an internal audit function, that fact and the processes it employs for evaluating and continually improving the effectiveness of its governance, risk management and internal control processes. ☐ [If the entity complies with paragraph (a):] and we have disclosed how our internal audit function is structured and what role it performs at: [insert location] [If the entity complies with paragraph (b):] and we have disclosed the fact that we do not have an internal audit function and the processes we employ for evaluating and continually improving the effectiveness of our risk management and internal control processes at: [insert location] ☒ set out in our Corporate Governance Statement. 7.4 A listed entity should disclose whether it has any material exposure to environmental or social risks and, if it does, how it manages or intends to manage those risks. ☒ and we have disclosed whether we have any material exposure to environmental and social risks in our Corporate Governance Statement. ☐ set out in our Corporate Governance Statement Page 13 Corporate Governance Council recommendation Where a box below is ticked,2 we have followed the recommendation in full for the whole of the period above. We have disclosed this in our Corporate Governance Statement: Where a box below is ticked, we have NOT followed the recommendation in full for the whole of the period above. Our reasons for not doing so are:3 PRINCIPLE 8 – REMUNERATE FAIRLY AND RESPONSIBLY 8.1 The board of a listed entity should: (a) have a remuneration committee which: (1) has at least three members, a majority of whom are independent directors; and (2) is chaired by an independent director, and disclose: (3) the charter of the committee; (4) the members of the committee; and (5) as at the end of each reporting period, the number of times the committee met throughout the period and the individual attendances of the members at those meetings; or (b) if it does not have a remuneration committee, disclose that fact and the processes it employs for setting the level and composition of remuneration for directors and senior executives and ensuring that such remuneration is appropriate and not excessive. ☐ [If the entity complies with paragraph (a):] and we have disclosed a copy of the charter of the committee at: [insert location] and the information referred to in paragraphs (4) and (5) at: [insert location] [If the entity complies with paragraph (b):] and we have disclosed the fact that we do not have a remuneration committee and the processes we employ for setting the level and composition of remuneration for directors and senior executives and ensuring that such remuneration is appropriate and not excessive: [insert location] ☒ set out in our Corporate Governance Statement OR ☐ we are an externally managed entity and this recommendation is therefore not applicable 8.2 A listed entity should separately disclose its policies and practices regarding the remuneration of non- executive directors and the remuneration of executive directors and other senior executives. ☒ and we have disclosed separately our remuneration policies and practices regarding the remuneration of non-executive directors and the remuneration of executive directors a