Abstract: A combination portable horizontal grinder mixer for processing a variety of grains includes a housing that includes an upwardly opening lid and which defines and encloses therein a mixing chamber having a horizontally disposed reel-type mixer extending therethrough for simultaneously tumbling and mixing the grains and a spiraled auger that pushes the grain toward the rear of the housing for conveyance through a discharge auger that communicates with the mixing chamber and thence into a storage bin and interconnected to the housing is an infeed chute for delivering grain to a hammer mill that processes grain that requires milling before the grain can be fed into the mixing chamber with the reel-type mixer within the housing being horizontally oriented so that the mixer has greater capacity, eliminates bridging and has a low center of gravity for stable transport.