|Quadrangle map, 1:250,000-scale||NB|
|Quadrangle map, 1:63,360-scale||A-4|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||This occurrence is along the west side of lower Nabesna Glacier. It is at an elevation of about 3,400 feet and about 700 feet west of the glacier. The occurrence is about 0.4 mile north-northwest of the center of section 7, T. 4 N., R. 14 E. of the Copper River Meridian. This is locality 10 of Richter (1973), locality 20 of Richter and others (1975), and National Park Service locality WRST-27 (unpublished data). Cobb and Richter (1980) included this locality as an 'Unnamed occurrence'. It is located to within a few hundred feet.|
Geologic descriptionA 10- to 20-cm-wide calcite vein contains gold and cobaltite (Richter and others, 1975). The vein contains up to 10 ounces of gold per ton (Richter and others, 1975). The vein is in highly altered and limonite-stained Triassic, Nikolai Greenstone(?) near the contact with a Tertiary porphyry intrusion (Richter, 1973).
|Geologic map unit||(-142.926024400906, 62.1464050087253)|
|Mineral deposit model||Vein|
|Age of mineralization||Tertiary? The age of the nearby porphyry is inferred to be Tertiary.|
|Alteration of deposit||The host rock to the vein is strongly hydrothermally altered (Richter, 1973).|
|Indication of production||None|
Additional commentsThe occurrence is in the Wrangell-St. Elias National Preserve.
Cobb, E.H., and Richter, D.H., 1980, Summaries of data on and list of references to metallic and selected nonmetallic mineral deposits in the Nabesna quadrangle, Alaska: U.S. Geological Survey Open-File Report 80-927, 117 p.
|Reporters||Travis L. Hudson (Applied Geology)|
|Last report date||11/24/2002|