Eagle River

Site Name

Primary: Eagle River
Secondary: Mayflower

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Commodity

Primary: Lead
Primary: Copper
Primary: Silver
Primary: Zinc
Primary: Gold

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Location

State: Alaska
District: Anchorage

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Land Status

Not available

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Holdings

Not available

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Workings

Not available

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Ownership

Not available

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Production

Not available

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Deposit

Record Type: Site
Operation Category: Prospect
Operation Type: Unknown
Years of Production:
Organization:
Significant:

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Physiography

Not available

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Mineral Deposit Model

Model Name: Polymetallic veins
Model Name: Low-sulfide Au-quartz vein, Chugach-type
Model Name: Low-sulfide Au-quartz vein

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Orebody

Not available

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Structure

Not available

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Alterations

Alteration Type: L
Alteration Text: Oxidation of Cu minerals.

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Rocks

Not available

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Analytical Data

Not available

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Materials

Ore: Silver
Ore: Sphalerite
Ore: Pyrite
Ore: Malachite
Ore: Gold
Ore: Chalcopyrite
Ore: Arsenopyrite
Ore: Galena
Gangue: Calcite
Gangue: Quartz

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Comments

Comment (Commodity): Ore Material = argentiferous galena

Comment (Reference): Primary Reference = Park, 1933

Comment (Deposit): Model Name = Low-sulfide Au-quartz veins ? (Cox and Singer, 1986; model 36a ? ) or Chugach-type low-sulfide Au-quartz vein ? (Bliss, 1992; model 36a.1 ?) or Polymetallic veins ? (Cox and Singer, 1986; model 22c ?)

Comment (Deposit): Model Number = 36a, 36a.1, 22c

Comment (Deposit): Other Comments = Property originally known as the Mayflower lode (Park, 1933).

Comment (Workings): Workings / Exploration = Assays show 0.05 oz/ton Au and 10 to 25 oz/ton Ag (Park, 1933). Limited amount of work on prospect by 1933. Smith (1938) reported prospecting in 1936 - vein opened by a few open cuts with apparently encouraging results. By 1951 the prospect could not be found (White, 1952).

Comment (Geology): Geologic Description = Mineralized quartz veins in fine-grained, massive metagraywacke of the Late Cretaceous Valdez Group. The host rock shows sheared zones that strike N 5 W and are vertical or dip about 65 NW. Several large interbedded conglomerate lenses and minor argillite are present within the graywacke. Mineralized quartz veins that are less than 1 ft thick and that can be traced for 400 ft, are found in two sheared zones 50 ft apart (Park, 1933). Quartz veins contain galena, pyrite, sphalerite, arsenopyrite, chalcopyrite, and limited malachite. Assays show 0.05 oz/ton Au and 10 to 25 oz/ton Ag (Park, 1933). Calcite veinlets found in joints of graywacke (Martin and others, 1915). The most conspicous quartz vein can be traced south of the river and probably is also exposed to the north of Eagle River.

Comment (Exploration): Status = Inactive

Comment (Geology): Age = Late Cretaceous or younger; the veins cut Late Cretaceous Valdez Group rocks.

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References

Reference (Deposit): Smith, P.S., 1938, Mineral industry of Alaska in 1936: U.S. Geological Survey Bulletin 897-A, p. 1-107.

Reference (Deposit): Park, F.C., 1933, The Girdwood District, Alaska: U.S. Geological Survey Bulletin 849-G, p. 381-424.

Reference (Deposit): Cobb, E.H., 1979, Summary of references to mineral occurrences (other than mineral fuels and construction materials in the Anchorage quadrangle, Alaska: U.S. Geological Survey Open-File Report 79-1095, 184 p.

Reference (Deposit): 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.

Reference (Deposit): White, M.G., 1952, Preliminary summary of reconnaissance for uranium in Alaska, 1951: U.S. Geological Survey Circular 196, 17 p.

Reference (Deposit): Capps, S.R., 1916, Gold mining in the Willow Creek district: U.S. Geological Survey Bulletin 642-G, p. 147-194, 195-200.

Reference (Deposit): Clark, S.H.B., and Yount, M.E., 1972, Reconnaissance geologic map and geochemical analyses of stream-sediment and rock samples of the Anchorage A-6 Quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map 351, 2 sheets, scale 1:63,360.

Reference (Deposit): Jansons, Uldis, Hoekzema, R.B., Kurtak, J.M., and Fechner, S.A., 1984, Mineral occurrences in the Chugach National Forest, Southcentral Alaska: U.S. Bureau of Mines Open-File Report 5-84, 218 p., 2 sheets, scale 1:250,000.

Reference (Deposit): Cobb, E.H., 1972, Metallic mineral resources map of the Anchorage quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-409, 1 sheet, scale 1:250,000.

Reference (Deposit): 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.

Reference (Deposit): 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.

Reference (Deposit): Berg, H.C., and Cobb, E.H., 1967, Metalliferous Lode Deposits of Alaska. U.S. Geological Survey Bulletin 1246, 254 p.

Reference (Deposit): Clark, S.H.B., 1972, Reconnaissance bedrock geologic map of the Chugach Mountains near Anchorage, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map 350, 1 sheet, scale 1:250,000.

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