Uranium resources of New Mexico
Uranium deposits in New Mexico occur in rocks of many geologic ages and lithologic types. Bedded deposits in continental, fluvial sandstones of the Morrison Formation of Jurassic age are the most important. A cluster of large deposits in McKinley and Valencia Counties, comprises the Grants Mineral Belt, the largest uranium area in the United States. During the period 1948-1975, 52,250,000 tons of ore with an average grade of 0.22 percent U3O8 and containing 112,684 tons of uranium oxide have been produced in New Mexico, almost entirely from the Grants mineral belt. This amounts to 40 percent of ...