A mixer attachment for use with a skid steer. In one embodiment, the mixer attachment includes a mixing tub with a circumferential wall extending between a floor and a rim to define an interior compartment for holding a quantity of material. An auger may be provided that mixes the materials and is driven by a hydraulic drive unit. In some embodiments, one or more material retarders extend into the interior compartment to impede movement of the material within the interior compartment. A discharge chute allows discharge of material from the interior compartment. The mixing tub is movable between a scooping position and a mixing position.