bucket elevator

Bucket elevator in a factory wants to lift a material with the following characteristics: material to be transported = bituminous coal. specific weight (?)=50 lb/?ft?^3. angle of repose (?)=40°. abrasiveness = non-abrasive corrosiveness = non-corrosive. maximum size = 1/32 in. working temperature =86 ? ?30?. capacity =16 ton/hour. distance between centers of the pulleys (h)=28 m.?82 feet. operating conditions (service) = 8 hours/day.