National Uranium-Resource Evaluation: genesis of the Bokan Mountain, Alaska uranium-thorium deposits

Technical Report · Tue Jan 01 00:00:00 EST 1980

DOI:https://doi.org/10.2172/5365043· OSTI ID:5365043

Thompson, T. B.; Lyttle, T.; Pierson, J. R.

The objective of this research project is to develop a model that can be used in evaluating peralkaline granitic-syenitic rocks for uranium potential. The deposits at Bokan Mountain (also known as Kendrick Bay) were studied to generate a specific model as to their mode of formation. To achieve the objective several types of data have been obtained: (1) Distinction by mapping and core logging of multiple intrusive phases within the Bokan Mountain Granite complex; (2) Detailed chemical and petrographic data on each igneous phase; (3) Extent of and mineralogical/chemical characteristics of the associated wallrock alteration; (4) Radiometric dates on magmatic and hydrothermal products; (5) Fluid inclusion analysis of quartz, calcite, and fluorite from mineralized rock; (6) Ore and sulfide mineralogy; (7) C, O, and S isotope analyses of minerals from mineralized rock; (8) Trace element dispersion with respect to mineralized zones; and (9) Structural data for interpretation of emplacement mechanisms as well as post-magmatic events important to ore localization. The U/Th mineralization is localized in shear zones as vein-like bodies or in irregular cylindrical bodies formed by concentrations of microfractures. The ore zones are localized within or on top of syenitic masses and have intense albitization and chloritization, with subordinate amounts of calcite, fluorite, quartz, sulfides, and tourmaline. Hematite occurs peripherally to the higher-grade ore zones. Uranothrorite and uraninite are the main ore minerals.

• Research Organization: Colorado State Univ., Fort Collins (USA). Dept. of Earth Resources
• DOE Contract Number: EY-76-C-13-1664
• OSTI ID: 5365043
• Report Number(s): GJBX-38(80); TRN: 80-010383
• Country of Publication: United States
• Language: English

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GEOCHEMICAL SURVEYS
THORIUM RESERVES
URANIUM DEPOSITS
DRILL CORES
GEOCHEMISTRY
MINERALOGY
ORIGIN
CALCITE
CARBON ISOTOPES
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URANINITES
URANOTHORITE
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ALKALINE EARTH METAL COMPOUNDS
CALCIUM CARBONATES
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CALCIUM FLUORIDES
CALCIUM HALIDES
CARBON COMPOUNDS
CARBONATES
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HALIDES
HALOGEN COMPOUNDS
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RESERVES
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SILICATES
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