|Quadrangle map, 1:250,000-scale||NB|
|Quadrangle map, 1:63,360-scale||B-4|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||This occurrence is on the creek draining the northwest side of Devils Mountain. It is at an elevation of about 3,100 feet, about 6,000 feet southwest of the summit of Devil Mountain. This is locality 11 of Richter and others (1975) and National Park Service locality WRST-5 (unpublished data). It was included as an 'Unnamed occurrence' by Cobb and Richter (1980). It is located to within several hundred feet.|
Geologic descriptionLarge boulders up to 6 feet or more in diameter of massive pyrrhotite, chalcopyrite, actinolite, and garnet occur at this locality (Richter and others, 1975). The source of these boulders is unknown. Quaternary deposits cover much of the lower areas of this drainage but a Cretaceous hornblende quartz diorite and diorite stock that intrudes upper Paleozoic metavolcanic rocks makes up most of the bedrock in the headwaters of the drainage (Richter, 1971 [I-656]; 1976).
|Geologic map unit||(-142.941936366947, 62.4167249739459)|
|Mineral deposit model||Cu skarn (Cox and Singer, 1986; model 18b)|
|Mineral deposit model number||18b|
|Age of mineralization||Cretaceous? The parent deposit may be a skarn related to a hornblende quartz diorite and diorite stock in the headwaters of this drainage. This pluton is though to be mid-Cretaceous in age like the Nabesna pluton several miles to the south (Richter, Lanphere, and Matson, 1975).|
|Alteration of deposit||Calc-silicate and sulfide replacement.|
|Workings or exploration||The source of the mineralization has not been identified.|
|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.
Richter, D.H., 1976, Geologic map of the Nabesna quadrangle, Alaska: U.S. Geological Survey Miscellaneous Investigations Series Map I-932, 1 sheet, scale 1:250,000.
Richter, D.H., Lanphere, M.A., and Matson, N.A., Jr., 1975, Granite plutonism and metamorphism, eeastern Alaska Range, Alaska: Geological Society of American Bulletin, v. 86, p. 819-820.
|Reporters||Travis L. Hudson (Applied Geology)|
|Last report date||11/24/2002|