"Measurements of thermophysical properties of Utah tar sands have been performed at the University of Wyoming, with support from the Department of Energy under Contract DE-AS20-81LC10534. Emphasis has been placed on measurements of relative permeability, specific heat, thermal conductivity and thermal diffusivity. The present report discusses results of measurements of specific heat (sand matrix and bitumen), thermal conductivity and thermal diffusivity of N.W. Asphalt Ridge, Utah tar sand. Thermal diffusivity is found to decrease with temperature almost linearly, with a sample-to-sample variation of plus or minus 10%. Over the same range, thermal conductivity remains a constant to plus or minus 5%, but is sample-specific, with variations of between 1.2 to 1.8 w/m degrees K. An apparatus designed to examine the details of two phase flow in porous media has been designed, built and tested. A description of the apparatus and some preliminary results are also discussed in this report."