|Quadrangle map, 1:250,000-scale||LH|
|Quadrangle map, 1:63,360-scale||C-1|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||This occurrence is at an elevation of about 6,200 feet on a ridge along the east side of the southeast headwater tributary of South Fork Kuskokwim River. The map site is 0.4 mile south-southwest of peak 6980, in the northeast corner of section 17, T 17 N, R 22 W, of the Seward Meridian. This is locality Cobb (1972 [MF 412]; 1976 [OF 76-485]). The location is probably accurate to within a quarter of a mile.|
Geologic descriptionReed and Elliott (1970) reported that sparse fractures as much as 1 cm wide in quartz monzonite are filled with quartz, chalcopyrite, pyrite, and traces of other sulfide minerals. Pyrite and chalcopyrite are also disseminated in the quartz monzonite. A sample of a vein contained greater than 20,000 ppm copper, 100 ppm silver, and anomalous lead. The mineralized quartz monzonite is Tertiary; it intrudes upper Mesozoic slate and graywacke as well as older, probably Cretaceous, granitic rocks (Cobb and Reed, 1981).
|Geologic map unit||(-153.32232559308, 61.5680694593986)|
|Mineral deposit model||Polymetallic veins (Cox and Singer, 1986, models 22c)|
|Mineral deposit model number||22c|
|Age of mineralization||Tertiary. Quartz veins and mineralization crosscut Tertiary intrusive rocks.|
|Alteration of deposit||Quartz veining.|
|Workings or exploration||Reconnaissance sampling has been completed in this area (Reed and Elliott, 1970).|
|Indication of production||None|
Cobb, E.H., 1972, Metallic mineral resources map of the Lime Hills quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-412, 1 sheet, scale 1:250,000.
Cobb, E.H., 1976, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Iliamna, Lake Clark, Lime Hills, and McGrath quadrangles, Alaska: U.S. Geological Survey Open-File Report 76-485, 101 p.
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.
|Reporters||Travis L. Hudson and Madelyn A. Millholland|
|Last report date||6/10/2001|