SUPPLEMENTAL NOTICE OF 2023 ANNUAL GENERAL MEETING

Hong Kong Exchanges and Clearing Limited and The Stock Exchange of Hong Kong Limited take no responsibility for the contents of this notice make no representation as to its accuracy or completeness and expressly disclaim any liability whatsoever for any loss howsoever arising from or in reliance upon the whole or any part of the contents of this notice.SUPPLEMENTAL NOTICE OF 2023 ANNUAL GENERAL MEETING References are made to the notice (the “Notice”) and the circular (the “Circular”) of 2023 Annual General Meeting of Aluminum Corporation of China Limited* (the “Company”) dated 10 May 2024 which set out the time and venue of the 2023 Annual General Meeting of the Company (the “AGM”) and contain the details of the resolutions to be proposed at the AGM for the consideration and approval of the shareholders of the Company (the “Shareholders”).Pursuant to the provisions of the Articles of Association of the Company when a general meeting is held the Shareholders who individually or together hold more than 3% of the Shares of the Company are entitled to put forward extraordinary proposals to the Company pursuant to which Aluminum Corporation of China* (中 国 铝 业 集 团 有 限 公 司 ) the controlling Shareholder of the Company who directly and indirectly holds approximately 32.42% of the Shares of the Company as at the date of this supplemental notice put forward certain extraordinary proposals and submitted them in writing to the convener of the AGM. According to the relevant provisions of relevant laws and regulations and the Articles of Association of the Company the abovementioned extraordinary proposals will be submitted at the AGM of the Company for consideration.SUPPLEMENTAL NOTICE IS HEREBY GIVEN that the AGM which will be convened as originally scheduled at the Company’s conference room No. 62 North Xizhimen Street Haidian District Beijing the People’s Republic of China at 2:00 p.m.on Tuesday 25 June 2024 will consider and if thought fit pass the resolutions set out in the Notice as well as the following newly-added resolutions proposed by Aluminum Corporation of China* (中国铝业集团有限公司 ) the controlling Shareholder of the Company (unless the context requires otherwise terms used in this supplemental notice have the same meanings as defined in the Circular): – 1 –ORDINARY RESOLUTION 1. To consider and approve the resolution in relation to the proposed renewal of liability insurance for the year 2024–2025 for the Directors Supervisors and senior management members of the Company; SPECIAL RESOLUTION 2. To consider and approve the resolution in relation to the amendments to the Articles of Association the Rules of Procedures for Shareholders’ Meeting the Rules of Procedures for the Board Meeting and the Rules of Procedures for the Supervisory Committee Meeting; ORDINARY RESOLUTIONS (CUMULATIVE VOTING) 3. To consider and approve the resolution in relation to the election of Mr. Shi Zhirong as an executive Director of the eighth session of the Board of the Company; 4. To consider and approve the resolution in relation to the election of Mr. Zhang Wenjun as a shareholder representative Supervisor of the eighth session of the Supervisory Committee of the Company.By order of the Board Aluminum Corporation of China Limited* Ge Xiaolei Joint Company Secretary Beijing the PRC 7 June 2024 As at the date of this notice the members of the Board comprise Mr. Dong Jianxiong Mr. Zhu Runzhou Mr. Ou Xiaowu and Mr. Jiang Tao (Executive Directors); Mr. Zhang Jilong and Mr. Chen Pengjun (Non-executive Directors); Mr. Qiu Guanzhou Mr. Yu Jinsong and Ms. Chan Yuen Sau Kelly (Independent Non-executive Directors).Notes: (a) Details of the above-mentioned resolutions are set out in the supplemental circular of the Company dated 7 June 2024.(b) The revised form of proxy of AGM (the “Revised Form of Proxy of AGM”) has been published on the website of the Hong Kong Stock Exchange (www.hkexnews.hk) and the website of the Company (www.chalco.com.cn).– 2 –IMPORTANT NOTICE: The Revised Form of Proxy of AGM shall supersede the form of proxy of AGM published on the website of the Hong Kong Stock Exchange (www.hkexnews.hk) andthe website of the Company (www.chalco.com.cn) on 9 May 2024 (the “Original Form of Proxyof AGM”). Shareholders who have duly completed and returned the Original Form of Proxy of AGM shall note that the Original Form of Proxy of AGM is no longer applicable to the AGM.Shareholders who intend to appoint a proxy to attend the AGM and vote on the resolutions set out in the Notice and this supplemental notice are requested to complete and return the Revised Form of Proxy of AGM in accordance with the instructions printed thereon not less than 24 hours before the time appointed for the holding of the AGM or any adjournment thereof (as the case may be). Completion and return of the Revised Form of Proxy of AGM will not prevent you from attending and voting in person at the AGM or any adjournment thereof if you so wish.(c) For particulars of other resolutions proposed at the AGM eligibility for attending the AGM registration procedures for attending the AGM closure of register of members and other matters regarding the AGM please refer to the Notice and Circular of the AGM of the Company dated 10 May 2024. * For identification purposes only –3–