Eagle River

Prospect in Alaska, United States with commodities Silver, Gold, Copper, Lead, Zinc

Geologic information

Identification information

Deposit ID 10000980
MRDS ID A011652
Record type Site
Current site name Eagle River
Alternate or previous names Mayflower
Related records 10282417

Geographic coordinates

Geographic coordinates: -149.09262, 61.12955 (WGS84)
Relative position Prospect located near the south bank of Eagle River, 4,500 ft west-northwest of the terminus of Eagle Glacier. Accurate within 2,000 ft. Locality 7 on plate 33 of Park (1933), locality 51 of Cobb (1972), and locality 40 of MacKevett and Holloway (1977).
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Silver Primary
Gold Primary
Copper Primary
Lead Primary
Zinc Primary

Comments on the commodity information

  • Ore Material = argentiferous galena

Materials information

Materials Type of material
Silver Ore
Arsenopyrite Ore
Chalcopyrite Ore
Gold Ore
Malachite Ore
Pyrite Ore
Sphalerite Ore
Galena Ore
Calcite Gangue
Quartz Gangue

Alteration

  • (Local) Oxidation of Cu minerals.

Mineral occurrence model information

Model code 273
USGS model code 36a
Deposit model name Low-sulfide Au-quartz vein
Mark3 model number 27
Model code 274
USGS model code 36a.1
Deposit model name Low-sulfide Au-quartz vein, Chugach-type
Mark3 model number 26
Model code 85
USGS model code 22c
Deposit model name Polymetallic veins
Mark3 model number 46

Nearby scientific data

(1) -149.09262, 61.12955

Comments on the geologic information

  • 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.
  • Age = Late Cretaceous or younger; the veins cut Late Cretaceous Valdez Group rocks.

Economic information

Economic information about the deposit and operations

Development status Prospect
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Anchorage

Comments on the workings information

  • 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).

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A011652
USGS Alaska Resource Data File ARDF AN113

Bibliographic references

  • 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.

  • Deposit

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

  • Deposit

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

  • Deposit

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

  • 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.

  • 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.

  • 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.

  • 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.

  • Deposit

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

  • 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.

  • Deposit

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

  • 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.

  • 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.

Comments on the references

  • Primary Reference = Park, 1933

General comments

Subject category Comment text
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 ?)
Deposit Model Number = 36a, 36a.1, 22c
Deposit Other Comments = Property originally known as the Mayflower lode (Park, 1933).

Reporter information

Type Date Name Affiliation Comment
Reporter 30-JUL-1998 D.P. Bickerstaff U.S. Geological Survey
Reporter 30-JUL-1998 S.W. Huss U.S. Geological Survey