... coal mining,ore exploration, 2,in construction drilling of railway,road,port,bridge 3,can be disambled if needy Drilling ... 4 ( 15KW) Applications of HGY-200 core drilling rig: 1.Construction drilling of the projects e.g. prospection, railway ... , road, port, bridge, water conservancy and hydropower, tunnel, well, industrial and civil construction2. Coal ...