In the continuing characterization studies of Utah oil sands, this article was focused on the Circle Cliffs deposits which occur in the southeastern region of Utah. The bitumen was separated from the oil sand using a toluene extraction method. The extracted bitumen was fractionated using the modified SARA method and its fractional composition was compared to the other bitumens obtained from the Uinta Basin deposits. This comparison indicated that Circle Cliffs bitumen was unique among the Utah oil sand bitumens, particularly with respect to the chemical composition of its resin fraction, but showed resemblance with the Canadian Athabasca bitumen in some features. The effect of resin composition on the bitumen viscosity is discussed. Mineralogical analysis was performed on the solids, which indicated relatively large proportions of carbonate and kaolinite minerals. The undesirable effect of these minerals in the modified hot-water processing of Circle Cliffs oil sands is briefly discussed. © 1994.
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