Progress Announcement on Financial Assistance to Subsidiary and Related Party Transaction

Securities Code: 000878 Securities Abbreviation: Yunnan Copper Announcement Number: 2026-044 Yunnan Copper Co., Ltd. Progress Announcement on Financial Assistance to Subsidiary and Related Party Transaction The Company and the Board of Directors guarantee the content of the information disclosure is true, accurate, and complete, and there is no false record, misleading statement or major omission. I. Overview of Financial Assistance Matter Yunnan Copper Co., Ltd. (hereinafter referred to as the Company) held the 11th meeting of the 10th Board of Directors on March 25, 2026, and the 2025 Annual Shareholders' Meeting on April 17, 2026, respectively. The "Proposal on Financial Assistance to Subsidiaries and Related Party Transactions for 2026" was deliberated and approved. It was agreed that the subsidiary China Copper International Trade Group Co., Ltd. (hereinafter referred to as China Copper International Trade) would provide a RMB 1 billion or equivalent USD internal loan to another subsidiary of the Company, Yunnan Copper Hong Kong Co., Ltd. (hereinafter referred to as Yunnan Copper Hong Kong). For specific details, please refer to the "Announcement of Resolutions of the 11th Meeting of the 10th Board of Directors of Yunnan Copper Co., Ltd." (Announcement No.: 2026-010) disclosed by the Company on the designate