Is Dachai Mining Co., Ltd. a state-owned enterprise?

No, according to official website, Qinghai Dachaidan Mining Co., Ltd., it is a Chinese-foreign cooperative enterprise approved by Qinghai Provincial People's Government, not a state-owned enterprise. Founded in 2000, Qinghai Dachaidan Mining Co., Ltd. is located in Haixi Mongolian and Tibetan Autonomous Prefecture, Qinghai Province, and is a professional and technical service-oriented enterprise.