This contributed report represents a re-release of a major study of the uranium favorability of Cordilleran metamorphic core complexes. It was funded by the US Department of Energy (DOE) through a subcontractor (Bendix) to Principal Investigators Peter J. Coney and Stephen J. Reynolds, then at the University of Arizona. The report was released in 1980 as DOE report GJBX-258 (80). The availability of DOE reports generated during this time period is variable, so the Arizona Geologic Survey graciously provided the opportunity to include this report in its Contributed Report series. I scanned the original paper version of the report, not an easy task since in those days we taped and pasted photos and other figures directly onto sheets of paper, making use of a sheet-fed scanner a bit of a challenge. But all the pages were eventually scanned successfully.Originally published by the U.S. Dept of Energy as part of their National Uranium Resource Evaluation program, ca. 1980.