Unnamed

Occurrence in Alaska, United States with commodities Silver, Gold, Copper, Zinc

Geologic information

Identification information

Deposit ID 10003354
MRDS ID A106104
Record type Site
Current site name Unnamed

Geographic coordinates

Geographic coordinates: -162.81909, 54.96586 (WGS84)
Relative position Approximate location is south of Walrus Peak. Anomaly no. 54 of Christie (1974) and no. 8 of MacKevett and Holloway (1977, p.11). See also CB001 in Cold Bay quadrangle (Wilson, 1997).
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Silver Primary
Gold Primary
Copper Primary
Zinc Secondary

Materials information

Materials Type of material
Pyrite Ore
Magnetite Gangue

Alteration

  • (Local) Propylitic alteration is present to a moderate extent in the diorite and may be more common in the volcanic rocks. Hydrothermal minerals include chlorite, epidote, clay, and locally magnetite.

Mineral occurrence model information

Model code 105
USGS model code 25a-d
Deposit model name Epithermal vein, generic
Mark3 model number 119

Host and associated rocks

  • Host or associated Host
    Rock type Volcanic Rock (Aphanitic)
    Stratigraphic age (youngest) Pliocene
    Stratigraphic age (youngest) Pliocene

Nearby scientific data

(1) -162.81909, 54.96586

Comments on the geologic information

  • Geologic Description = Christie (1974) briefly examined an east-west oriented 1 by 4 mi (1.6 by 6.4 km) color anomaly. The anomaly occurs in andesitic volcanic rocks, that include flows, pyroclastic rocks and breccia intruded in the center of the anomaly by a medium-grained dioritic pluton, on the east by a feldspar porphyry and on the west by minor diorite dikes. At east end of the color anomaly, a large covered area 1 mi (1.6 km) wide of indeterminate length may expand the occurrence. Volcanic rocks contain disseminated and fracture-controlled pyrite; mineralization does not increase at contact with the diorite. Both the diorite and volcanic rocks are cross-cut by thin breccia zones composed of severely leached and bleached angular wall rocks in a matrix of iron oxide. At western end of the anomaly, pyrite concentrations are highest in pyroclastic rock and breccia units.
  • Age = Miocene or younger

Economic information

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Alaska Peninsula

Comments on the workings information

  • Workings / Exploration = Christie (1974) reports brief reconnaissance geologic mapping and the collection of more than 30 soil and silt samples. Copper content typically was less than 50 ppm, although one sample yielded 101 ppm. Zinc ranged as high as 490 ppm, silver to 4.1 ppm and gold to 0.03 ppm.

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A106104
USGS Alaska Resource Data File ARDF FP004

Bibliographic references

  • Deposit

    Christie, J.S., 1974, Aleut-Quintana-Duval 1974 joint venture, final report: Unpublished Quintana Minerals Corporation report, 24 p., 3 appendices, 2 maps. (Report held by the Aleut Corporation, Anchorage, Alaska.)

  • 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.

Comments on the references

  • Primary Reference = Christie, 1974

General comments

Subject category Comment text
Deposit Model Name = Epithermal gold vein
Deposit Other Comments = No quartz veins are mentioned by Christie (1974), but this does not indicate that they are absent, inasmuch as his focus was mainly on porphyry mineralization.

Reporter information

Type Date Name Affiliation Comment
Reporter 06-MAY-1994 G.D. DuBois U.S. Geological Survey
Reporter 06-MAY-1994 F.H. Wilson U.S. Geological Survey