|Quadrangle map, 1:250,000-scale||SK|
|Quadrangle map, 1:63,360-scale||A-2|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||This occurrence is near the southeast corner of section 35, T. 32 S., R. 59 E, of the Copper River Meridian. It is at an elevation of about 1,600 feet about 0.2 miles southeast of hill '2015'. The location is from pages 3 and 4 of Herbert and Race (1965) and is considered accurate. This location apparently corresponds to location 9 in Cobb (1972 [MF 424] which is located, probably less accurately, approximately 0.5 miles to the southeast.|
Geologic descriptionThe following description is summarized from Herbert and Race, 1965. Rocks in the area are metasediments, including marble and gneiss, that strike northwesterly; there is also some east-west faulting. The prospect is located on a steep cliff at the head of a talus slope that contains float of magnetite in marble and chalcopyrite with hematite in an impure schistose marble that has been partially altered to skarn. The deposit is considered to be low-grade mineralization in metamorphic rocks close to an east-west fault. Only stream sediment sample values are reported. Copper values in the vicinity of the prospect do not exceed 90 ppm copper, but 3 samples to the south varied between 120 and 130 ppm copper. The age of the mineralization is not well established, but is probably Cretaceous based on the age of the nearby intrusive rocks (Gilbert , 1988).
|Geologic map unit||(-135.451838669616, 59.0496767463388)|
|Mineral deposit model||Skarn; disseminated, contact metasomatic (Cox and Singer, 1986; model 18d or 18b).|
|Mineral deposit model number||18d or 18b|
|Age of mineralization||The age is not well established but the deposit is probably Cretaceous based on the age of nearby intrusive rocks (Gilbert , 1988).|
|Alteration of deposit||Limestone partly altered to skarn (Herbert and Race, 1965).|
|Workings or exploration||Very little information is available.|
|Indication of production||None|
Berg, H.C., and Cobb, E.H., 1967, Metalliferous lode deposits of Alaska: U.S. Geological Survey Bulletin 1246, 254 p.
Brew, D.A., and Ford, A.B., 1985, Preliminary reconnaissance geologic map of the Juneau, Taku River, Atlin, and part of the Skagway 1:250,000 quadrangles, southeastern Alaska: U.S. Geological Survey Open-File Report 85-395, 23 p., 2 sheets, scale 1:250,000.
Cobb, E.H., 1972, Metallic mineral resources map of the Skagway quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-424, 1 sheet, scale 1:250,000.
Cobb, E.H., 1978, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Mt. Fairweather and Skagway quadrangles, Alaska: U.S. Geological Survey Open-File Report 78-316, 123 p.
Gilbert, W.G., 1988, Preliminary geology and geochemistry of the northern Chilkat Range: Alaska Division of Geological and Geophysical Surveys Report of Investigations 88-8, 2 sheets, scale 1:36,200.
Herbert, C.F., and Race, W.H., 1964, Geochemical investigations of selected areas in southeastern Alaska, 1964: Alaska Division of Mines and Minerals Geochemical Report 1, 75 p.
|Reporters||T.C. Crafford (T. Crafford & Associates, Anchorage)|
|Last report date||2/4/2001|