Jinchengxin Mining Management Co., Ltd.

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Stock Code: 603979 Stock Abbreviation: Jin Chengtong Announcement No.: 2026-020

Convertible Bond Code: 113615 Convertible Bond Abbreviation: Jin Cheng Convertible Bond

Convertible Bond Code: 113699 Convertible Bond Abbreviation: Jin 25 Convertible Bond

Jin Chengtong Mining Management Co., Ltd.

Announcement on the Redemption of Idle Raised Funds for Cash Management and Continuing Cash Management

The board of directors and all directors of the company guarantee that this announcement does not contain any false records, misleading statements, or major omissions, and bear legal responsibility for the truthfulness, accuracy, and completeness of its content.

Important Content Reminder:

● Investment Type: Structured Deposit

● Amount of Cash Management: 400,000,000 yuan

● Procedures Completed: The company held the 29th meeting of the 5th board of directors on November 28, 2025, and approved the proposal on the use of part of the idle raised funds for cash management. This proposal was reviewed and approved by the Audit and Risk Management Committee before being submitted to the board of directors for approval.

● Special Risk Reminder: Although the cash management products purchased with idle raised funds are safe, highly liquid, and principal-protected products, which belong to low-risk investment categories, the financial market is greatly influenced by macroeconomic, fiscal, and monetary policies, and the investment may be affected by market fluctuations. Investors are advised to pay attention to investment risks.

Jin Chengtong Mining Management Co., Ltd. (hereinafter referred to as “the Company”) held the 29th meeting of the 5th board of directors on November 28, 2025, and unanimously agreed that the company and its subsidiaries use no more than 800,000,000 yuan (including principal) of idle raised funds for cash management, with a usage period of within 12 months from the date of approval by the board of directors. Within the above limits and time frame, funds can be rolled over for use, and the investment balance at any point in time shall not exceed the aforementioned investment limit. The product duration shall not exceed the internal decision-making authorization usage period and shall not exceed 12 months; the investment types are safe, highly liquid, principal-protected products or other compliant products (including structured deposits, agreed deposits, notice deposits, time deposits, large certificates of deposit, and other cash management products), and shall not be used for pledge and investment behavior for the purpose of securities investment. The use of idle raised funds for cash management is within the approval authority of the company’s board of directors and does not require submission to the shareholders’ meeting for approval. The sponsoring institution, China Galaxy Securities Co., Ltd., issued a clear and uncontroversial verification opinion. For specific details, please refer to the announcement titled “Jin Chengtong’s Announcement on the Use of Part of the Idle Raised Funds for Cash Management” disclosed by the company on November 29, 2025, on the Shanghai Stock Exchange website (www.sse.com.cn).

I. Redemption of Previous Idle Raised Funds Cash Management Products

Based on the above resolution, the company used temporarily idle raised funds to purchase structured deposit products amounting to 400,000,000 yuan on December 10, 2025. The specific content can be found in the “Announcement on Opening a Special Settlement Account for Cash Management Products and the Progress of Using Idle Raised Funds for Cash Management” disclosed by the company on December 13, 2025, on the Shanghai Stock Exchange website (www.sse.com.cn).

Recently, the aforementioned structured deposit products have matured and been redeemed, and the relevant principal and interest have been returned to the special account for raised funds. The specific situation is as follows:

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The cash management special settlement account used for the above products has been canceled, and the canceled account information is as follows:

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II. Situation of This Cash Management

(1) Purpose of Cash Management

Due to the need for a certain period for the construction of projects invested with raised funds, there is a temporary idle situation with some raised funds. To improve the efficiency of the use of raised funds and reasonably utilize some temporarily idle raised funds, while ensuring that it does not affect the construction of the investment projects and the safety of the raised funds, to increase the company’s income and provide more returns for the company and its shareholders.

(2) Amount of This Cash Management: 400,000,000 yuan

(3) Source of Funds

All sourced from the temporarily idle portion of the raised funds from the company’s issuance of convertible corporate bonds to unspecified objects in 2025.

(4) Situation of Opening a Special Settlement Account for Cash Management Products with Raised Funds

To meet the needs of this cash management of raised funds, the company has opened a special settlement account for cash management products with raised funds, as follows:

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The special settlement account opened by the company for cash management products will not store non-raised funds or be used for other purposes. The cash management principal and accumulated income stored in this account will be returned to the company’s special raised funds account after which the account will be canceled.

(5) Basic Situation of This Cash Management Product

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Note: The above products do not involve structured arrangements.

The income and principal obtained from the company’s use of temporarily idle raised funds for cash management will be promptly returned to the special account for raised funds after the maturity of the cash management products and will be managed and used in strict accordance with the regulations of the China Securities Regulatory Commission and the Shanghai Stock Exchange regarding the supervision measures for raised funds.

III. Cash Management Risk Analysis and Risk Control Measures

(1) Investment Risk

Although the cash management products purchased with idle raised funds are safe, highly liquid, and principal-protected products, which belong to low-risk investment categories, the financial market is greatly influenced by macroeconomic, fiscal, and monetary policies, and the investment may be affected by market fluctuations.

(2) Risk Control Measures

1. The company will strictly handle related cash management businesses in accordance with the “Regulations on the Supervision of Raised Funds by Listed Companies,” “Self-Disciplinary Supervision Guidelines No. 1 for Listed Companies on the Shanghai Stock Exchange,” and other relevant regulations, and standardize the use of raised funds.

2. To control risks, the company will choose principal-protected products that are highly safe and liquid, with the maximum duration of individual products not exceeding 12 months when conducting cash management.

3. The financial management center will establish a ledger, analyze and track the operation of funds in a timely manner, strengthen risk control and supervision, and strictly control fund safety.

4. Independent directors and the Audit and Risk Management Committee have the right to supervise and inspect the use of funds, and if necessary, may hire professional institutions for auditing. The internal audit institution of the company is responsible for conducting a comprehensive inspection of the products, reasonably estimating possible risks and returns.

5. The company will strictly perform information disclosure obligations in a timely manner in accordance with relevant regulations of the China Securities Regulatory Commission and the Shanghai Stock Exchange.

IV. Impact of Investment on the Company

The use of idle raised funds for cash management by the company and its subsidiaries is conducted on the premise of ensuring the necessary funds for the company’s investment projects and guaranteeing the safety of raised funds, and does not affect the normal turnover needs of the company’s daily funds, nor the normal operation of projects using raised funds, and will not affect the normal development of the company’s main business. At the same time, through appropriate cash management of idle raised funds, to reasonably utilize idle raised funds and obtain certain investment returns, it is beneficial to realize the maximization of shareholder interests.

The products for cash management conducted by the company and its subsidiaries will be strictly processed in accordance with accounting standards and reported in the financial statements, subject to the annual audit results.

V. As of the date of this announcement, the situation of the company’s use of idle raised funds for cash management in the last 12 months

As of the date of this announcement, the balance of the company’s and subsidiaries’ use of part of the temporarily idle raised funds for cash management is 800,000,000 yuan (including this time). The highest single-day balance of cash management using idle raised funds and the usage period have not exceeded the board of directors’ authorized range.

The situation of using idle raised funds for cash management in the last 12 months is as follows:

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This announcement is hereby made.

Board of Directors of Jin Chengtong Mining Management Co., Ltd.

March 17, 2026

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