Mine roof supports

A mining installation comprising an armoured conveyor made up of a plurality of pans articulated together end-to-end, a plurality of hydraulically powered, self-advancing mine roof supports located side by side along a goaf side of said conveyor, one or more double-acting advancing rams connecting each roof support to one of said pans, each of said roof supports having a base means, a pair of spaced apart, elongate base members being incorporated in said base means and seating on a mine floor, each of said supports having a forward end intended to be located, in use, adjacent said goaf side of said conveyor and a rearward end intended to be remote from said conveyor, a rail located between said spaced apart base members and attached at a forward end thereof to one of said pans of said conveyor, and a lifting jack carried by said base members at or near said front end thereof and operable on said rail to lift said front ends of said base members from said mine floor and in this condition be advanced towards said conveyor by operation of said one or more double-acting advancing rams.