Abstract: An improved bottom grain bin auger discharge construction includes a hopper centrally disposed in the bottom of a grain storage bin. A grain tube extends from the hopper to the outside of the bin and includes a discharge auger for moving the grain in the tube. A separate transfer or sweep auger is positioned within the bin extending outward from the hopper. The sweep auger is driven through a linkage including a drive shaft extending from outside the bin to a gear box positioned within the hopper. The discharge auger associated with the grain tube is driven by the same motor through a separate linkage. The linkages are arranged for separate and sequential control of the sweep auger and the discharge auger.