Uranium in the Santa Fe area, New Mexico
— William L. Chenoweth

The Colorado Plateau prospecting boom of the early 1950s spread eastward into the Rio Grande trough and the Sangre de Cristo Mountains in the mid-1950s. In the Santa Fe area, uranium occurrences are located in pegmatites, shear zones and quartz veins in Precambrian rocks, in sandstones of Triassic, Cretaceous and Tertiary age, and in Tertiary volcanic and instrusive rocks. Some 8,754 metric tons of ore have been mined from a vein-type deposit in the Espinaso Volcanics of Oligocene age, and a significant low-grade deposit has been developed in the Galisteo Formation of Eocene age. The occurrences described in this paper are within an area bounded by T12N, T25N, the Rio Grande and R14E. Figure 1 shows all of the known occurrences of material containing 0.02 percent U308 or greater.