Described is a process for extracting bitumen from oil sands. Water is mixed with oil sands to form a slurry. The slurry and a hydrocarbon solvent are passed through a hydrotransport pipeline to form an extracted slurry. Dilution water is added to the extracted slurry to form a diluted extracted slurry to reduce the viscosity of the slurry to assist in subsequent bitumen separation. A flocculant may be added to assist subsequent separation or to reduce dilution water requirements.