During the late 1970's, the Laramie Energy Technology Center operated two in-situ combustion projects in the Northwest Asphalt Ridge tar sand deposit of Utah. Some of the heavy oils produced were observed to have high pour points, which resulted in handling problems in cold weather. These heavy oils contain waxes, which were found to be n-alkane homologues ranging past carbon number 60. These alkanes seem to have been derived from what are probably Ozokerite veins, which are found in the tar sand deposit. Samples from these veins and waxes derived from produced heavy oils were studied using /sup 13/C NMR, IR, and chemical ionization mass spectrometry.