This project is located in Sanshan Island Industrial Park, Laizhou City, Shandong Province. It is the first underwater mining project of Zhaojin Group and currently the largest single gold deposit in China. It is also the largest single gold deposit discovered globally in the past two decades. The intake shaft is 1530m deep and has a net diameter of 6.5m, making it one of the deepest vertical shafts completed in China. At the same time, our company also undertook the construction of the main shaft of Ruihai Mine (under the general contracting of mining, soil and safety, with a depth of 1417m and a net diameter of 6.3m; the height of the well tower is 100.2m, the highest completed in China), and the No. 3 measure well (with a depth of 1087m and a net diameter of 9m).