Bitumen recovery from thin oil sand reservoirs was modeled on a 150:1 scale, two-dimensional apparatus based on the theory of steam assisted gravity drainage. Injections of only steam and of steam and organic solvent were compared at high temperature (180 °C) and high pressure (686–882 kPa). Oil sand was simulated using homogeneously mixed extra heavy oil (<10 mPa s at 200 °C) and glass beads (diameter 1.5 mm) to achieve a porosity of 0.3. Steam temperatures, pressures, flow rates, and the evolution of steam chambers were monitored during the extractions. Recovery factor and steam chamber growth rate were compared. Extraction using steam with 3.0–7.4 vol% hexane improved the bitumen recovery factor by at least 30%. The added solvent resulted in the steam chamber reaching its greatest area 1200 s sooner than when using steam alone, equivalent to 0.9 year in the field. The extra heavy oil …​