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Mills & Trimble

Prospect, Inactive

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Commodities and mineralogy

Main commodities Ag; Au
Other commodities Cu; Ni
Ore minerals arsenopyrite; chalcopyrite; gold; pyrite
Gangue minerals calcite; quartz

Geographic location

Quadrangle map, 1:250,000-scale SV
Quadrangle map, 1:63,360-scale B-5
Latitude 59.26
Longitude -151.56
Nearby scientific data Find additional scientific data near this location
Location and accuracy The prospect is located in the northern one-half of section 1, T. 11 S., R. 14 W., of the Seward Meridian, about one mile west of Mt. Mills and about 1.5 miles north of the end of the Rocky River road that runs from Seldovia to Windy Bay. This location is accurate to within half a mile. This is Cobb's (1972, MF-397) location 3.

Geologic setting

Geologic description

The bedrock around Mt. Mills is Cretaceous Valdez Group metasediments and greenstone that is cut by felsic dikes of probable Tertiary age (Cobb, 1979, OFR 80-87). The prospect consists of a zone 30 to 50 feet wide, composed of reddish, decaying dike rock which contains some thin quartz veins; it has been fractured by post-veining movement. The zone has a general north-south trend and dips 60 to 70W. The quartz veins are less than a foot wide and contain arsenopyrite, pyrite, and chalcopyrite. Several small adits have been made in this zone but no assay results are reported (Martin and others, 1915).
Geologic map unit (-151.562101706358, 59.2593476417822)
Mineral deposit model Low-sulfide, Au-quartz vein (Cox and Singer, 1986; model 36a)
Mineral deposit model number 36a
Age of mineralization Younger than Cretaceous host rocks.
Alteration of deposit Alteration or oxidation of dike rock related to a possible shear zone.

Production and reserves

Workings or exploration Several small adits were driven in the early 1900s. No assay results are reported (Martin and others, 1915).
Indication of production None
Reserve estimates None.

References

MRDS Number A010647

References

Berg, H.C., and Cobb, E.H., 1967, Metalliferous lode deposits of Alaska: U.S. Geological Survey Bulletin 1246, 254 p.
Cobb, E.H., 1972, Metallic mineral resources map of the Seldovia quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-397, 1 sheet, scale 1:250,000.
Cobb, E.H., 1979, Summary of references to mineral occurrences (other than minerals fuels and construction materials) in the Seldovia quadrangle, Alaska: U.S. Geological Survey Open-file Report 80-87, 47 p.
Grant, U.S., and Higgins, D.F., Jr., 1910, Preliminary report on the mineral resources of the southern part of Kenai Peninsula: U.S. Geological Survey Bulletin 442-D, p. 166-178.
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.
Martin G.C., Johnson, B.L., and Grant, U.S., 1915, Geology and mineral resources of Kenai Peninsula, Alaska: U.S. Geological Survey Bulletin 587, 243 p.
Reporters Jeff A. Huber (Anchorage)
Last report date 3/4/1999