铜陵有色：目前铜陵有色金属集团股份有限公司持有中铁建铜冠70%股权

Group 1 - The core point of the article is that Tongling Nonferrous Metals Group Co., Ltd. holds a 70% stake in China Railway Construction Copper Crown Investment Co., Ltd., which operates the Mirador copper mine through its overseas subsidiary Ecuacorriente S.A. [2] - The Mirador copper mine's phase II expansion project is scheduled to begin heavy load testing in July 2025 [2] - Investors are advised to refer to the company's announcements on the statutory information disclosure platform for specific details [2]