National Uranium Resource Evaluation, Glens Falls Quadrangle: New York, Vermont, and New Hampshire

Technical Report · Tue Jun 01 04:00:00 EDT 1982

OSTI ID:5368911

McHone, J G; Wagener, H D

Grenville anatectic pegmatites of the Adirondack Mountains of New York are a favorable environment for the occurrence of uranium deposits of not less than 100 tons U/sub 3/O/sub 8/ at an average grade of not less than 100 ppM U/sub 3/O/sub 8/. The pegmatites have local high concentrations of U/sub 3/O/sub 8/ in uraninite and lesser concentrations in allanite, uranothorite, and rare-earth minerals. Metamorphosed anatectic pegmatites of the Mt. Holly Complex in the Green Mountains of Vermont are a favorable environment for uranium deposits. Allanite is prominent in thorium-rich pegmatites, but intergranular pitchblende is the principal ore mineral of uranium-rich pegmatites. Mt. Holly pegmatite appears to be Grenville pegmatite with part of the uranium removed by Paleozoic metamorphism. The Mt. Holly Complex is a favorable environment for vein-type deposits of uranium in biotite gneisses, mica schists, and quartzites. Pitchblende is concentrated along minor thrust faults and steeply dipping fault zones. Disseminations of pitchblende occur along biotite lamellae in gneissoid and schistose rocks in the vicinity of faults, and in pods and lenses of biotite-rich schist in both highly contorted rocks and interlayered gneisses and schists. Carnotite and torbernite commonly occur along faults, fractures, and biotite lamellae in uraniferous rocks. The two-mica granite of the small Sunapee pluton in New Hampshire contains authigenic favorable areas consisting of closely spaced Mesozoic fractures filled with hexavalent uranium minerals. The uranium is being leached from the granite by ground water.

• Research Organization: Bendix Field Engineering Corp., Grand Junction, CO (USA). Grand Junction Operations; Chiasma Consultants, Inc., South Portland, ME (USA)
• DOE Contract Number: AC13-76GJ01664
• OSTI ID: 5368911
• Report Number(s): PGJ/F-025-82; ON: DE82017080
• Country of Publication: United States
• Language: English

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DATA ANALYSIS
EVALUATION
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