|Quadrangle map, 1:250,000-scale||BN|
|Quadrangle map, 1:63,360-scale||A-3|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||The Pargon Mountain mica mine is on the low, mountain front slopes between the two eastern headwater tributaries of Oregon Creek. It is estimated to be between 600 and 800 feet elevation. Oregon Creek is a west tributary to Boston Creek. The headwaters of Oregon Creekare on the flank of Pargon Mountain on the south side of the Bendeleben Mountains. This locality was not included by Cobb (1972; MF 417) but Cobb (1975; OFR 75-429) summarizes references under the name 'Pargon Mtn.'.|
Geologic descriptionGranite pegmatite with large muscovite crystals was first prospected here in 1901 (Anderson, 1943). Sheets of muscovite up to 20 inches long and 14 inches wide and commonly 6 inches across have been recovered and used by residents of Nome for stove windows and lamps. The pegmatite is poorly exposed and at least 6 shallow pits, 2 hand-dug trenches, and 4 dozer trenches are present. Imperfections in the muscovite are few and most unweathered crystals are clear and unstained; some strategic mica was recovered and processed in the laboratory during WW II (Anderson, 1943). Other minerals common in the pegmatite are quartz, feldspar (including albite), black tourmaline, and red garnet. Microscopic examination revealed a few small biotite crystals. Some inclusions of magnetite (in mica ?) were also observed. The host pegmatite is in high grade metamorphic rocks of the Bendeleben Mountains (Till and others, 1986).
|Geologic map unit||(-163.475631657715, 65.136280296214)|
|Mineral deposit model||Granite pegmatite|
|Age of mineralization||Probably mid-Cretaceous, the age of extensive crustal melting and granitic plutonism in this region (Hudson, 1994).|
|Alteration of deposit||Clay coatings on weathered muscovite crystals is present.|
|Workings or exploration||The pegmatite is poorly exposed and at least 6 shallow pits, 2 hand-dug trenches, and 4 dozer trenches are present (Anderson, 1943).|
|Indication of production||Yes; small|
Anderson, Eskil, 1943, Pargon Mountain Muscovite Prospect, Seward Peninsula, Alaska: Alaska Territorial Department of Mines Mineral Investigation 44-1, 9 p
Cobb, E.H., 1972, Metallic mineral resources map of the Bendeleben quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-417, 1 sheet, scale 1:250,000.
Cobb, E.H., 1975, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Bendeleben quadrangle, Alaska: U.S. Geological Survey Open-File Report 75-429, 123 p.
Gamble, B.M., 1988, Non-placer mineral occurrences in the Solomon, Bendeleben, and southern part of the Kotzebue quadrangles, western Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-1838-B, 13 p., 1 sheet, scale 1:250,000.
Hudson, T.L., 1994, Crustal melting events in Alaska, in Plafker, G., and Berg, H. C., eds., The Geology of Alaska: Geological Society of America, DNAG, The Geology of North America, Vol. G-1, p. 657-670.
|Reporters||Travis L. Hudson (Applied Geology)|
|Last report date||3/15/1999|