The exceptional physical and mechanical properties of steel-fiber shotcrete make this material valuable in the mining industry. It has proved to offer a safe, low-cost and effective means of: providing supplemental support to both roof and ribs; reducing oxygen and moisture attack on rock; constructing stoppings, overcasts and explosion proof bulkheads; and fireproofing timber, urethane foam, belt-drive areas, mine stops and storage facilities. It has also saved 40 percent in energy for ventilation. Where there is air leakage between hallways it partially short-circuits the total air path and deprives the farthermost point of adequate ventilation. Unless such leakage is eliminated the exhaust fan must be made to move more air. By comparison with other cementious mixtures used in mines steel-fiber concrete is greater in: resistance to cracking, toughness, fatigue endurance limit and fire endurance. At the present time benefits of steel-fiber shotcrete in foreign mines are far greater than they ever can be in the United States. Those benefits come from the high cost for support in roadways in foreign mines. In Europe, for example, roadways are supported by steel arches with timber and steel lagging. Those supports generally contact from 10 to 30 percent of the roadway surface. Ground movements cause pont loading and uneven stresses in such arches and it becomes necessary to install additional arches. Steel-fiber shotcrete can be sprayed against the arches and onto the surfaces between them, however, so that contact support approaches 100 percent.