From introduction: Mining began in the Black Hawk (Bullard Peak) district in 1881 when high-grade silver ore was found at the Alhambra mine. Most of the silver produced was native silver, associated with nickel and cobalt arsenides and sulfides. In 1920 pitchblende was recognized on the dumps of some of the old mines, and since 1949 the district has been of interest as a possible source of ores that contain uranium, nickel, and cobalt.

Abstract: Uranium-bearing copper deposits occur in steeply dipping beds of the Sangre de Cristo formation of Pennsylvanian and Permian age south of Coyote, Mora County, N. Mex. Mapping and sampling of these deposits indicate that they occur in lenticular carbonaceous zones in shales and arkosic sandstones. Samples from these zones contain as much as 0.067 percent uranium and average 3 percent copper. Metatyuyamunite is disseminated in some of the arkosic sandstone beds, and uraninite was identified in some of the copper sulfide nodules occurring in the shale. In polished section these sulfide nodules were found to be composed principally of chalcocite with some bornite and covellite, as well as pyrite and malachite. Most of the samples were collected near the surface from the weathered zone. The copper and uranium were probably deposited with the sediments and concentrated into zones during compaction and lithification. Carbonaceous material in the Sangre de Cristo formation provided the environment that precipitated uranium and copper from mineral-charged connate waters forced from the clayey sediments.

Report discussing investigations seeking uranium in deposits of black shale around the geographical areas of the Western States

Report discussing geological investigations of the uranium-bearing nickel-cobalt-native silver deposits in the Black Hawk district of Grant County, New Mexico. Details of the area's geology are presented, and topographic and geologic maps are presented.

Report discussing the geological details of uranium-bearing copper deposits in the Sangre de Cristo formation, located south of Coyote, Mora County, New Mexico.

Abstract: Reconnaissance for uranium in coal and black shale in New Mexico during 1952 was largely an extension of work initiated during the 1951 field season. No uranium deposits of economic interest were found, although minor amounts of uranium were noted at several localities.

Report discussing the U.S. Geological Survey's investigation of uranium-bearing coal, carbonaceous shale, and carbonaceous sandstone occurring around La Ventana Mesa in New Mexico.

A report regarding uranium-bearing coal and carbonaceous shale in La Ventana Mesa Area, in Sandoval County, New Mexico. This report concerns work done on behalf of the division of raw materials of the U.S. Atomic Energy Commission.