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GEOREF RECORD

A tungsten-rich porphyry molybdenum occurrence at Bear Mountain, Northeast Alaska

James C. Barker and R. C. Swainbank
A tungsten-rich porphyry molybdenum occurrence at Bear Mountain, Northeast Alaska (in Mineral deposits in northern Alaska, Anonymous)
Economic Geology and the Bulletin of the Society of Economic Geologists (November 1986) 81 (7): 1753-1759

Abstract

Molybdenum and tungsten porphyry mineralization occurs near Bear Mountain in northeast Alaska within a regional zone of small domes and intrusions. This zone can be traced 80 km to the west and easterly into Canada.A 50-ha (approximately 100 acres) mineralized area, defined by soil samples containing greater than 600 ppm Mo and 500 ppm W, is underlain by an altered complex of probable early Tertiary age consisting of rhyolite porphyry, quartz porphyry, intrusive breccia, and rhyolite porphyry dikes. The complex has intruded upper Paleozoic metasedimentary rocks.Surface exposures of rubble and limited outcrop are extensively leached; molybdenum occurs as molybdite oxides and tungsten occurs in both ferberite and huebnerite end members of the wolframite series. There is an apparent zonation from an upper tungsten-topaz zone capped by massive silica to a lower oxidized molybdenum-rich zone. A lead-rich halo surrounds the complex.


ISSN: 0361-0128
EISSN: 1554-0774
Coden: ECGLAL
Serial Title: Economic Geology and the Bulletin of the Society of Economic Geologists
Serial Volume: 81
Serial Issue: 7
Title: A tungsten-rich porphyry molybdenum occurrence at Bear Mountain, Northeast Alaska
Title: Mineral deposits in northern Alaska
Author(s): Barker, James C.Swainbank, R. C.
Author(s): Anonymous
Affiliation: U. S. Bur. Mines, Fairbanks, AK, United States
Pages: 1753-1759
Published: 198611
Text Language: English
Publisher: Economic Geology Publishing Company, Lancaster, PA, United States
References: 7
Accession Number: 1987-018090
Categories: Economic geology, geology of ore depositsGeochemistry of rocks, soils, and sediments
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. geol. sketch map
N68°19'60" - N68°25'00", W142°15'00" - W142°00'00"
Secondary Affiliation: Geoprize, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, Society of Economic Geologists
Update Code: 1987
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