Liaoning Iron Mine: Cross-section of 4×3.8 meters, rock hardness F10, using a roof bolter equipped with a WOSERLD hydraulic rock drill. Bolt hole depth is 2 meters, with an average drilling time of 1 minute and 30 seconds per hole.
Liaoning Iron Mine: Cross-section of 4×3.8 meters, rock hardness F10, using a roof bolter equipped with a WOSERLD hydraulic rock drill. Bolt hole depth is 2 meters, with an average drilling time of 1 minute and 30 seconds per hole.