This paper describes the methods and equipment developed at the Bureau’s Experimental Oil-Shale mine near Rifle, Colo. for placing men in position to scale loone rock from the walls, pillars, and roofs of high atopen or rooms. The equipment developed at Rifle han application not only in oil-shale mining but in most of the country’s underground limestone mines and in the exploitation of other mineral deposits mined in high stones by room-and-pillar methods.