A mineral mining installation with a multi-section conveyor on which is guided a plough provided with a sword plate. The conveyor channel sections each have two E-shaped members attached to a barrier plate which is in turn connected to the goaf side of the conveyor. A narrow gap is produced between these two members: which members define upper and lower guide passages for a chain used to drive the plough. The sword plate extends through a gap formed between the lower ends of the conveyor and the members. The outer face of each of the members has ribs thereon for connection with shifting rams and the central limb of each member projecting towards the conveyor is of hollow reinforced construction. These webs can be detachable from the remainder of the members.