|Quadrangle map, 1:250,000-scale||VA|
|Quadrangle map, 1:63,360-scale||D-1|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||This prospect is on the east slope of the valley of a small north tributary of the Cheshnina River. The map site is at an elevation of about 4,500 feet near the northeast boundary of section 36, T. 1 N., R. 6 E., of the Copper River Meridian. This prospect is approximately located, perhaps to within a half-mile. It is locality 111 of Winkler and others (1981 [OFR 80-892-B]).|
Geologic descriptionThis prospect is near the basal contact of the Triassic Nikolai Greenstone, which unconformably overlies carbonate rocks of the Skolai Group (Winkler and others, 1981 [OFR 80-892-B]; Winkler and others,1981 [OFR 80-892-A). Native copper has been observed in Nikolai Greenstone nearby; it partly to completely fills amygdules and other open spaces in the host basalt. This copper may have been mobilized and deposited as part of the main copper mineralizing event in the region. This event is interpreted to be related to Late Jurassic or Early Cretaceous deformation and metamorphism (MacKevett and others 1997, p. 88).
|Geologic map unit||(-144.225105371342, 61.8293389028823)|
|Mineral deposit model||Native copper filling amygdules and other open spaces in basalt?|
|Age of mineralization||Native copper in Nikolai Greenstone may have been mobilized and deposited as part of the main copper mineralizing event in the region. This event is interpreted to be related to Late Jurassic or Early Cretaceous deformation and metamorphism (MacKevett and others 1997, p. 88).|
|Alteration of deposit||Oxidation.|
|Workings or exploration||There are three patented mining claims at this location (Winkler and others, 1981[OFR 80-892-B]). At least some surface prospecting has probably taken place here.|
|Indication of production||None|
Additional commentsThis prospect is within the Wrangell-St. Elias National Preserve.
MacKevett, E.M., Jr., Cox, D.P., Potter, R.W., III, and Silberman, M.L., 1997, Kennecott-type deposits in the Wrangell Mountains, Alaska--High-grade copper ores near a basalt-limestone contact, in Goldfarb, R.J., and Miller, L.D., eds., Mineral deposits of Alaska: Economic Geology Monograph 9, p. 66-89.
Winkler, G.R., Miller, R.J., MacKevett, E.M., Jr., and Holloway, C.D., 1981, Map and summary table describing mineral deposits in the Valdez quadrangle, southern Alaska: U.S. Geological Survey Open-File Report 80-892-B, 2 sheets, scale l:250,000.
|Reporters||Travis L. Hudson|
|Last report date||12/14/2001|