Abstract: In a mill drum provided with wear protective linings and ore lifting and carrying means in the form of longitudinal wings comprising an elastomeric material and extending radially inwardly from the lining of the mill drum an arrangement for securely attaching the wings to the walls of said mill drum, comprising at least two contiguous anchoring rods extending in the longitudinal direction of the bases of the wings through longitudinal holes made through the material of the wings, said anchoring rods passing through yoke means, which are recessed in the bases of the wings at a desired pitch or distribution along said bases and being connected to means for pressing the complete wing units against the drum of the mill and for retaining said wings in their mounted position.

Abstract: A grinding plant for autogenous or semi-autogenous grinding of ores in particular, in separate mills in two steps. The second step uses material from the first step, which is provided with two outlets. The first outlet has holes for discharging relatively finely ground material to be further ground in the second step, and the second outlet has holes for discharging material containing relatively coarse pieces forming grinding media in the second step. A device is provided between the stages to control the flow of coarser material to the second step. Connected to the discharge side of the second step, which is provided with outlet holes as large as the holes for fine material in the first step, there is a means to separate material removed from the second step into a finely ground portion, which is led away, and a portion returned to the first and second steps in proportions adjustable by said means.