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Unnamed (east of Stony River)

Occurrence, Inactive

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Commodities and mineralogy

Main commodities Cu
Other commodities Ag
Ore minerals chalcopyrite; pyrite; pyrrhotite
Gangue minerals epidote; quartz

Geographic location

Quadrangle map, 1:250,000-scale LH
Quadrangle map, 1:63,360-scale B-2
Latitude 61.2993
Longitude -153.6655
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is at an elevation of about 5,000 feet on the south flank of a ridge on the east side of Stony River valley. The map site is near the southeast corner of section 13, T 14 N, R 25 W, of the Seward Meridian. This is location 17 of MacKevett and Holloway (1977), location 6 of Resource Associates of Alaska (1976), and location 44 of Gamble and others (1989). It is included as an unnamed occurrence by Cobb and Reed (1981). It is approximately located, perhaps to within one-half mile.

Geologic setting

Geologic description

Cobb and Reed (1981) reported that chalcopyrite, pyrite, and pyrrhotite occur as blebs and disseminations in Cretaceous(?) metasedimentary rocks adjacent to a Tertiary granitic pluton. The mineralization is localized in metasiltstone and metaconglomerate adjacent to and in roof pendants of the quartz diorite to quartz monzonite pluton. The metasedimentary rocks contain blebs and vugs of epidote, quartz, and feldspar. The area is crosscut by a regional northwest-trending fault. A 1,500-foot-diameter gossan containing 20 percent pyrite lies to the north of the occurrence. Rock samples contain as much as 2,700 ppm copper and 7 ppm silver (Resource Associates of Alaska, 1976).
Geologic map unit (-153.667771921955, 61.2986397704817)
Mineral deposit model Disseminated sulfides in contact zone of granitic pluton
Age of mineralization Tertiary. Mineralization is in the altered zone around a Tertiary pluton.
Alteration of deposit Silicification and epidote replacement.

Production and reserves

Workings or exploration Reconnaissance sampling has been completed in this area.
Indication of production None

References

MRDS Number A013076

References

Cobb, E.H., and Reed, B.L., 1981, Summaries of data on and lists of references to metallic and selected nonmetallic mineral occurrences in the Iliamna, Lake Clark, Lime Hills, and McGrath quadrangles, Alaska; Supplement to Open-File Report 76-485; Part A, Summaries to January 1, 1981: U.S. Geological Survey Open-File Report 81-1343-A, 25 p.
Gamble, B.M., Bailey, E.A., and Reed, B.L., 1989, Gold occurrences near Snowcap Mountain, Lime Hills B-2 quadrangle, Alaska: U.S. Geological Survey Open-File Report 89-0646, 8 p.
MacKevett, E.M., Jr., and Holloway, C.D., 1977, Map showing metalliferous and selected non-metalliferous mineral deposits in the eastern part of southern Alaska: U.S. Geological Survey Open-File Report 77-169-A, 99 p., 1 sheet, scale 1:1,000,000.
Resource Associates of Alaska, Inc., 1976, Geology and geochemistry of certain land within the Lake Clark National Park: Contract report for U.S. Bureau of Mines, Contract JO166108, 7 v.
Reporters Travis L. Hudson and Madelyn A. Millholland
Last report date 6/10/2001