1. Mineral Resources
  2. Online Spatial Data
  3. Alaska Resource Data File (ARDF)

Unnamed (north of Upper Copper Lake)

Occurrence, Inactive

Map
KML
XML
GeoJSON

Commodities and mineralogy

Main commodities Cu; Mo
Other commodities Ag
Ore minerals chalcopyrite; molybdenite; pyrite

Geographic location

Quadrangle map, 1:250,000-scale IL
Quadrangle map, 1:63,360-scale C-4
Latitude 59.61
Longitude -154.1378
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is at an elevation of about 800 feet on an unnamed north tributary of Upper Copper Lake. The site is in the NE1/4 SW1/4 sec. 36, T. 6 S., R. 29 W., Seward Meridian. The location is accurate within about 0.5 mile. It is locality 12 of Detterman and Cobb (1972).

Geologic setting

Geologic description

An unnamed north tributary to Upper Copper Lake drains a Tertiary, pyrite-rich granitic pluton that also contains disseminated flakes of molybdenite and chalcopyrite(?) (Reed, 1967). Stream-sediment samples collected by Reed in the area contained anomalous concentrations of copper, molybdenum, and silver, but he apparently did not analyze the mineralized intrusive rock. The granitic rock is extensively argillized and possibly sericitized.
Geologic map unit (-154.139951450336, 59.6093282824502)
Mineral deposit model Porphyry Cu-Mo? (Cox and Singer, 1986; model 21a).
Mineral deposit model number 21a?
Age of mineralization Tertiary.
Alteration of deposit Granitic host rock is extensively argillized and possibly sericitized. Reed (1967) noted extensive 'hydrogen metasomatism.'

Production and reserves

Workings or exploration Exploration in the area is limited to reconnaissance geologic mapping and collection of stream-sediment and possibly outcrop samples (Reed, 1967). Stream-sediment samples contained anomalous concentrations of copper, molybdenum, and silver.
Indication of production None

References

MRDS Number A013042

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.
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 B, Lists of references to Januray 1, 1981: U.S. Geological Survey Open-File Report 81-1343-B, 20 p.
Detterman, R.L., and Cobb, E.H., 1972, Metallic mineral resources map of the Iliamna quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-364, 1 sheet, scale 1:250,000.
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.
Reed, B.L., 1967, Results of stream sediment sampling and bedrock analyses in the eastern part of the Iliamna quadrangle, and at Kasna Creek, Lake Clark quadrangle, Alaska: U.S. Geological Survey Open-File Report 67-185, 18 p.
Reporters C.C. Hawley, Hawley Resource Group, Anchorage, Alaska
Last report date 6/6/2003