NOVELTY - The method involves combining biodiluent with bitumen to form diluted bitumen, where the biodiluent includes a liquid pyrolysis oil obtained from biomass pyrolysis, the liquid pyrolysis oil includes a portion of an organic phase of a liquid produced during the biomass pyrolysis and the biodiluent is soluble with the bitumen at a processing temperature from about 40 degree Celsius to about 90 degree Celsius. A diluent (126) is recovered from the diluted bitumen and recycled. The diluted bitumen is introduced to a unit for refining, upgrading or chemical conversion.    USE - Method for incorporating bio-derived materials into oil sand processing to reduce carbon footprint and produce chemicals, materials, and fuels.    ADVANTAGE - The method performs water-rich fraction so as to reduce fresh water use and biochar to improve stability of tailing ponds and sequester carbon, and enables integration of fast pyrolysis and multi-stage separation process into the oil sands refining process, thus reducing greenhouse gas emission profile. The method performs oil sands extraction operation with a fast pyrolysis process that produces renewable bio-oil fractions and biochar for improved sustainability of oil sands processing. The method enables reduces carbon footprint, and improves environmental image of oil sands bitumen. The method enables liquid pyrolysis fractions to serve as a flotation agent so as to enhance separation of water and fine solids from the bitumen. The method enables the biochar to be introduced to an oil sands tailing pond to stabilize or thicken solids contained in the tailing pond so as to reduce the reclamation time associated with the tailing pond, thus improving the quality of water that is recyclable from the tailing pond and removing contaminants and toxic materials in the tailing pond, and hence improving the quality of the soil produced following reclamation of the tailing pond.    DETAILED DESCRIPTION - The biodiluent is a liquid product. The liquid is a water-rich pyrolysis liquid or a low-water pyrolysis liquid. The diluent is a petroleum-derived diluent or a biomass derived diluent. An INDEPENDENT CLAIM is also included for a process for refining oil sand and biomass.    DESCRIPTION OF DRAWING(S) - The drawing shows a block diagram illustrating oil sands mining extraction process coupled with a fast pyrolysis process that converts biomass into biodiluent to modify bitumen viscosity.    Crusher (105)    Diluent (126)    Thickener (135)    Storage (150)    Refinery (155)