Abstract: The uranium resources of the Socorro 1° x 2° Quadrangle, New Mexico were evaluated to a depth of 1,500 m using surface and subsurface information where available. Uranium occurrences reported in the literature were located, described, and sampled. Geochemical data from rock, stream-sediment, and water samples as well as radiometric data from aerial, ground, and drill-hole surveys were used in the evaluation. Sulfate concentrations in ground water have a highly significant correlation with uranium in the quadrangle, and may be used as a pathfinder for uranium. Interpretation of the results of this investigation suggests that the following environments are favorable for uranium deposits containing at least 100 tons of uranium present in a mineable configuration in rock having an average grade of not less than 100 ppm U₃O: (1) epigenetic deposits in sandstones (class 240) of the Baca Formation and uppermost part of the underlying Crevasse Canyon Formation; (2) epigenetic deposits in the Todilto Limestone (class 230) and in sandstone of the uppermost part of the underlying Entrada Sandstone; and (3) vein-type deposits in sedimentary rocks (class 730) in the Popotosa Formation, San Andres Limestone, and Madera Group. The area around the Jeter mine, along the fault contact between the Popotosa Formation and the Precambrian, appears from uranium and sulfate anomalies in the hydrogeochemical and stream-sediment surveys to have the greatest potential for undiscovered vein-type uranium deposits. Environments considered unfavorable for uranium deposits containing 100 tons of uranium are: (1) all carbonaceous shales, lignites, and coals; (2) all limestone except the Todilto Limestone of the Laguna mining district, or the San Andres Limestone and limestone of the Madera Group where cut by faults of the Joyita and southern Manzano Mountains uplifts; (3) all sandstones except those of the Baca Formation and uppermost part of the Crevasse Canyon Formation, or sandstone of the Popotosa Formation just above the Jeter fault in the Ladron Mountains area; and (4) all plutonic, volcanic, and metamorphic rocks in the Socorro quadrangle.
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