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Uranium occurrences in the Northern Darby Mountains, Seward Peninsula, Alaska.
Fairbanks, AK: U.S. Department of the Interior, Bureau of Mines, IC 9103, 1986 Jan; :1-27
In 1980, the Bureau of Mines investigated the Northern Darby Mountains on the Seward Peninsula, Alaska, for radioactive mineral deposits. Uranium is concentrated in silicified shear zones in biotite quartz monzonite of the darby pluton. The shear zones are best exposed in steep, narrow, avalanche gullies; they are characterized by radiometric anomalies and by uranium and thorium geochemical anomalies. Radiometric and geochemical anomalies are also found over altered biotite quartz monzonite where there are no visible shear zones. The radiometric and uranium anomalies are often spatially, but apparently not genetically, associated with alkaline Mafic and Felsic dikes. Similar geochemical and radiometric anomalies over disclosed altered zones and geochemical anomalies in sediments downstream from the altered zones indicate that additional areas may also be favorable targets for uranium deposits. Analyses of panned, heavy mineral concentrates show no significant concentrations of uranium or thorium in resistant heavy minerals. This indicates that radioactive elements in the darby pluton are concentrated in soluble, nonresistant minerals that may constitute a recoverable uranium resource.
Geochemistry; Mineral-deposits; Mineralogy; Darby-Mountains; Alaska; Uranium-ore-deposits
IH; Information Circular
NTIS Accession No.
Fairbanks, AK: U.S. Department of the Interior, Bureau of Mines, IC 9103
Page last reviewed: September 2, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division