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Geologic map of bastnaesite deposits, Birthday claims, San Bernardino County, California
W. N. Sharp, L.C. Pray
1952, Miscellaneous Field Studies Map 4
In April 1949 a deposit containing considerable quantities of the rare mineral bastnaesite - the fluorocarbonate of cerium, lanthanum, and other rare earths - was discovered near Mountain Pass, San Bernardino County, Calif.  Small quantities of bastnaesite have been found in several places in the United States, but this area...
Uranium-bearing deposits west of Clancey, Jefferson County, Montana
Wayne Arthur Roberts, Arthur J. Gude
1952, Open-File Report 52-129
Nine uranium deposits occur in a small area vest of Clancey,Jefferson County, Mont. These deposits are all in or near silicifiedfracture zones in quarts monsonite and related rocks of the Boulderbatholith. The deposits contain pockets of uranium minerals in cavities in brecciated silicified rock. The primary uranium mineral pitch-blende has...