A belt conveyor has an upward sloping tube and a hopper extending outward from the lower intake end of the tube. A belt has an upper run passing along a hopper floor of the hopper then over a top S-roller of an S-roller assembly, under a bottom S-roller thereof, and up through the tube. Resilient bottom seal strips each extend along each side of the hopper with lower edges thereof bearing against the belt adjacent to side edges of the belt and resilient top seal strips are fastened on top of the corresponding bottom seal strips such that a lower edge of each top seal strip bears against the belt beside the lower edge of the corresponding bottom seal strip. Roller seals seal edges of the S-rollers and the belt passing therethrough, and a support surface supports the belt between the bottom S-roller and the intake end of the tube.
