Guocheng Mining Co., Ltd. Progress Announcement on External Guarantee

Stock Code: 000688 Stock Short Name: Guocheng Mining Announcement No.: 2026-023

Guocheng Mining Co., Ltd.

Progress Announcement on External Guarantees

The Company and all members of the board of directors warrant that the contents of this announcement are true, accurate, and complete, and that there are no false records, misleading statements, or material omissions.

I. Overview of the Guarantee

Guocheng Mining Co., Ltd. (hereinafter referred to as the “Company” or “Guocheng Mining”) convened the 49th meeting of the 12th session of the board of directors and the 2026 Second Extraordinary General Meeting on February 10, 2026, and February 27, 2026, respectively. The meeting deliberated and approved the “Proposal on the Expected Amount of External Guarantee Limits for 2026,” agreeing that the Company and its wholly consolidated subsidiaries within the scope of the consolidated statements will provide guarantee limits for新增 (incremental) total amounts not exceeding RMB 556,000 million, under which the guarantee limits to the subsidiaries with an asset-liability ratio of 70% or above (inclusive) shall not exceed RMB 180,000 million, and the guarantee limits to the subsidiaries with an asset-liability ratio below 70% shall not exceed RMB 376,000 million. Within the total guarantee limit, the guarantee limits between the Company and its subsidiaries may be adjusted for use as needed based on actual circumstances. When an adjustment occurs, for the guaranteed parties with an asset-liability ratio of 70% or above, the guarantee limit can only be obtained from guaranteed parties with an asset-liability ratio of 70% or above. The above guarantee limits may be used on a revolving basis, and the final outstanding guarantee balance will not exceed the guarantee limits approved this time. The authorization validity period for the expected guarantee limits will be one year from the date on which the 2026 Second Extraordinary General Meeting approves the proposal. For details, please refer to the “Announcement on the Expected Amount of External Guarantee Limits for 2026” (Announcement No.: 2026-010) and the “Announcement on Resolutions of the 2026 Second Extraordinary General Meeting” (Announcement No.: 2026-013) disclosed by the Company in designated media on February 11, 2026, and February 28, 2026, respectively.

Recently, Guocheng Mining’s controlling subsidiary Sichuan Guocheng Lithium Industry Co., Ltd. (hereinafter referred to as “Guocheng Lithium Industry”) signed a financing lease contract with Bank of China Financial Leasing Co., Ltd., carrying out financing lease business by way of direct leasing. The financing amount is RMB 50,97.2340 million. The Company provides a joint and several liability guarantee for the above business.

The above guarantee constitutes a specific guarantee matter occurring within the scope of guarantees approved by the 49th meeting of the 12th session of the board of directors and the 2026 Second Extraordinary General Meeting, and therefore does not require submitting again to the board of directors and the general meeting for consideration. This guarantee matter does not constitute a related-party transaction.

II. Basic Information of the Guaranteed Party

1. Company name: Sichuan Guocheng Lithium Industry Co., Ltd.

2. Date of establishment: February 13, 2023

3. Registered address: De’yang–Aba Ecological Economic Industrial Park, Mianzhu City, Sichuan Province

4. Legal representative: Deng Ziping

5. Registered capital: RMB 100,000 million

6. Unified social credit code: 91510683MAC86XF20Q

7. Scope of business: General projects: production of basic chemical raw materials (excluding the manufacturing of licensed chemical products such as hazardous chemicals); manufacturing of non-ferrous metal alloys; sale of non-ferrous metal alloys; processing of renewable resources; technology services, technology development, technology consulting, technology exchange, technology transfer, and technology promotion; import and export of goods. (Except for projects subject to approval according to law, business activities shall be conducted independently in accordance with the business license.) Licensed projects: road freight transportation (excluding dangerous goods); inspection and testing services. (After obtaining approval for projects subject to approval according to law, business activities may be carried out; the specific business projects shall be subject to the approval documents or permits issued by the relevant departments)

8. Equity structure: Guocheng Mining holds 75%, De’yang Investment Holding Xingchan Investment Co., Ltd. holds 25%, and the actual controller is Mr. Wu Cheng.

9. Key financial indicators:

Unit: RMB 10,000

■

10. Guocheng Lithium Industry has good credit status and is not a person subject to enforcement for breach of trust.

III. Main Contents of the Guarantee Agreement

1. Guarantee method: joint and several liability guarantee.

2. Guarantee scope: all debts in favor of the creditor under the principal contract held by the creditor against the lessee (regardless of whether such debts arise based on the financing lease relationship), including but not limited to the rent pre-interest payable by the lessee (if any) and rent, liquidated damages, guarantee deposit, early termination payment, use fees, capital usage fees, purchase price for remaining purchase, and other payable amounts that the lessee shall pay pursuant to the principal contract; as well as other obligations of the lessee other than the obligation to pay money. If the interest rate as agreed under the principal contract changes, the amounts adjusted accordingly due to such change shall also be included. All costs and expenses paid by the creditor for maintaining and realizing the principal debt and the guarantee rights (including but not limited to litigation fees, arbitration fees, notarization fees, preservation fees, fees for preservation guarantee, insurance fees for preservation, execution fees, audit fees, appraisal fees, inspection fees, government fees, lawyers’ fees, travel expenses, and fees collected by third parties that are legally to be borne by the lessee, etc.); other amounts payable by the lessee under the principal contract.

3. Guarantee period: from the effective date of this contract until the date on which the performance period of all debts of the lessee under the principal contract expires, plus three years. If the principal debt is to be performed in installments, the guarantee period is from the effective date of this contract until the date on which the performance period of the last installment of debt expires, plus three years. If the performance period of the lessee’s debts under the principal contract is changed, the guarantee period is from the effective date of this contract until the date on which the performance period of all changed debts expires, plus three years.

IV. Impact of This Provision of Guarantee

This guarantee provided by the Company to Guocheng Lithium Industry will help the development of Guocheng Lithium Industry and its demand for funds. Other shareholders of Guocheng Lithium Industry did not provide guarantees on a pro-rata basis and no counter-guarantee is set. Guocheng Lithium Industry is a controlling subsidiary of the Company, and the Company can promptly grasp its creditworthiness and financial position, making the guarantee risk controllable. There is no circumstance in which this guarantee undermines the interests of the Company and its shareholders, and it will not have any adverse impact on the Company’s normal operations and business development.

V. Cumulative Amount of External Guarantees and Amount of Guarantees with Overdue Status

As of the date of disclosure of this announcement, the actual outstanding external guarantee balance of the Company and its controlling subsidiaries is RMB 222,858.06 million, accounting for 85.66% of the Company’s latest audited net assets. After providing this guarantee, the actual outstanding external guarantee balance of the Company and its controlling subsidiaries will not exceed RMB 227,955.29 million, accounting for 87.62% of the latest audited net assets of the listed company. Except for the guarantee provided to Malkang Jinxin Mining Co., Ltd., the Company and its controlling subsidiaries have not provided guarantees to entities outside the consolidated financial statements. The Company and its controlling subsidiaries have no guarantees with overdue status, no guarantee-related litigation, and no situation where losses should be borne due to敗诉 (loss in a lawsuit) being determined as a result of the guarantee.

This announcement is hereby given.

Board of Directors of Guocheng Mining Co., Ltd.

March 27, 2026