Uranium deposits in the eastern San Juan Basin, Cibola, Sandoval and Rio Arriba Counties, New Mexico
Virginia T. McLemore and William L. Chenoweth
Although the first report of uranium in New Mexico was from volcanic rocks in the Jemez Mountains, very little uranium has been produced (<20,000 lbs of U308) from the eastern San Juan Basin. Uranium occurs in Morrison Formation sandstones, other sandstones, the Todilto Formation, other sedimentary rocks, epithermal veins, and disseminated deposits in igneous and metamorphic rocks. Uranium deposits in the Morrison and Todilto Formations were deposited during the Jurassic, although Tertiary-Quaternary oxidation and remobilization of some deposits may have occurred. Deposits in the Precambrian rocks in the Tusas Mountains are magmatic and related to granitic and pegmatitic rocks. Other uranium deposits in the eastern San Juan Basin may have been derived from devitrification and leaching from the Bandelier Tuff. The potential for near-future development of uranium deposits in this area is nil because of lack of demand, low uranium prices and low grade.
- McLemore, Virginia T.; Chenoweth, William L., 1992, Uranium deposits in the eastern San Juan Basin, Cibola, Sandoval and Rio Arriba Counties, New Mexico, in: San Juan Basin IV, Lucas, Spencer, G.; Kues, Barry S.; Williamson, Thomas E.; Hunt, Adrian P., New Mexico Geological Society, Guidebook, 43rd Field Conference, pp. 341-349.