Perennial Energy Holdings Limited, an investment holding company, engages in the exploration and mining of coking coal in the People's Republic of China. It offers clean, middling, sludge, and raw coal, as well as coalbed methane gas. The company also operates a coal refinery. In addition, it operates underground coal mines, comprising Hongguo Coal Mine, Baogushan Coal Mine, and Xiejiahegou Coal Mine, which are located in P