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Neacola River

Occurrence, Inactive

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Commodities and mineralogy

Main commodities Cu; Mo
Other commodities Pb
Ore minerals azurite; bornite; molybdenite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale LC
Quadrangle map, 1:63,360-scale D-1
Latitude 60.96
Longitude -153.05
Nearby scientific data Find additional scientific data near this location
Location and accuracy Occurrence is on peak 6,805 in the Neacola Mountains, NW corner of the Lake Clark D-1 quadrangle. Corresponds with locality 6 of Nelson and others (1985) and locality 19 of MacKevett and Holloway (1977). Sec. 17, T. 10 N., R. 21 W., of the Seward Meridian. Accurate within 1,200 meters.

Geologic setting

Geologic description

Disseminated quartz veins containing pyrite, azurite, and traces of bornite in medium- to coarse-grained biotite-hornblende granodiorite (Nelson and others, 1983; unit Ti4). The quartz veins locally contain 3,600 ppm Mo and 8,800 ppm Cu.
Geologic map unit (-153.05222390291, 60.9593799019854)
Mineral deposit model Porphyry Cu-Mo (Cox and Singer, 1986; model 21a)
Mineral deposit model number 21a
Age of mineralization Veins cut Tertiary granodiorite.
Alteration of deposit Unknown

Production and reserves

Workings or exploration Veins locally contain 3,600 ppm Mo and 8,800 ppm Cu (Nelson and others, 1985).
Indication of production None
Reserve estimates No reserves
Production notes No production

Additional comments

Area is very rugged and partly covered by glaciers. Site is in Lake Clark National Park and Preserve.

References

MRDS Number A013024

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.
MacKevett, E.M., Jr., and Holloway, C.D., 1977, Map showing metalliferous mineral deposits in the western part of southern Alaska: U.S. Geological Survey Open-File Report 77-169-F, 38 p., 1 sheet, scale 1:1,000,000.
Nelson, W.H., Carlson, C., and Case, J.E., 1983, Geologic map of the Lake Clark quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-1114-A, 1 sheet, scale 1:250,000.
Nelson, W.H., King, H.D., Case, J.E., Tripp, R.B., Crim, W.D., and Cooley, E.F., 1985, Mineral resource map of the Lake Clark quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-1114-B, 1 sheet, scale 1:250,000.
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 M.L. Miller (USGS); D.P. Bickerstaff (USGS)
Last report date 6/15/1998