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Head-Of-The-Bay (Cordova - Tacoma Copper Co.)

Prospect in Alaska, United States with commodities Copper, Silver, Zinc
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Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Commodities
  6. Materials information
  7. Host and associated rocks
  8. Nearby scientific data
  9. Economic information about the deposit and operations
  10. Mining district
  11. Links to other databases
  12. Bibliographic references
  13. General comments
  14. Reporter information

Geologic information

Identification information

Deposit ID 10000361
MRDS ID A010427
Record type Site
Current site name Head-Of-The-Bay (Cordova - Tacoma Copper Co.)
Related records 10161018

Geographic coordinates

Geographic coordinates: -145.55361, 60.66266 (WGS84)
Relative position This prospect is at an elevation of about 1500 feet near the head of Wesley Falls Creek. It is in the SE1/4 sec. 10, T 14 S., R. 2 W., of the Copper River Meridian. Location is accurate to within 1000 ft. Location corresponds to site C-21 of Jansons and others (1984).

Site location context

Political divisions (FIPS codes)

Valdez-Cordova(Census area)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Cordova C-5(quadrangle 1:63,360 scale)

Cordova NW(quadrangle 1:100,000 scale)

Cordova C(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Eastern Prince William Sound(hydrologic unit)

Prince William Sound(hydrologic accounting unit)

South Central Alaska(hydrologic subregion)

Alaska(hydrologic region)

Federal lands

Chugach National Forest(National Forest)

National Forest FS(Type of land area)

FS(Federal land areas administered by FS)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Copper Primary
Silver Secondary
Zinc Critical Secondary

Materials information

Materials Type of material
Chalcopyrite Ore
Pyrrhotite Ore

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Mafic Intrusive Rock > Diorite
  • Host or associated Host
    Rock type Sedimentary Rock > Clastic Sedimentary Rock > Siltstone
    Rock unit name Orca Group;Orca Group
    Rock description Orca Group;Orca Group

Nearby scientific data

(1) -145.55361, 60.66266
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = This prospect consists of chalcopyrite and pyrrhotite in fracture zones and as disseminations in the wallrocks in interbedded graywacke, slate, and volcanic rocks of the Tertiary Orca Group (Nelson and others, 1985). Four shear zones 1 to 5 feet wide cut the volcanic rocks.
  • Age = Probably Tertiary based on age of host rock (Nelson and others, 1985).

Economic information about the deposit and operations

Development status Prospect
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Copper River

Comments on the reserve resource information

  • Reserves = Inferred reserves of 800 tons @ 0.6% Cu (Jansons and others, 1984).

Comments on the workings information

  • Workings / Exploration = One adit observed in 1980 (Jansons and others, 1984) and reported by Grant and Higgins (1910). Two adits noted during industry exploration activity in 1986. The two adits are approximately 1/4 mile apart (B. Ellis, personal commun., 2000). Sampling and analyses during the 1980s by the U.S. Bureau of Mines (Jansons and others, 1984) resulted in the following values: Six chip samples contained 650 ppm to 4.05% Cu, 3.5 to 310 ppm Zn, and <0.1 to 1.8 ppm Ag. Two grab samples contained 4.6% and 5.2% Cu, 360 ppm and 0.15% Zn, and 8.8 ppm and 11 ppm Ag.

Reference information

Bibliographic references

  • 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

    Nelson, S.W., Dumoulin, J. A., and Miller, M.L., 1985, Geologic map of the Chugach National Forest, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-1645-B, scale 1:250,000.

  • Deposit

    Nelson, S.W., Dumoulin, J. A., and Miller, M.L., 1985, Geologic map of the Chugach National Forest, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-1645-B, 16 p., 1 sheet, scale 1:250,000.

  • Deposit

    Grant, U.S., and Higgins, D.F., Jr., 1910, Reconnaissance of the geology and mineral resources of Prince William Sound, Alaska: U.S. Geological Survey Bulletin 443, 89 p.

Comments on the references

  • Primary Reference = Jansons and others, 1984

General comments

Subject category Comment text
Deposit Other Comments = Chugach Alaska Corporation, Anchorage, Alaska has control of these lands.

Reporter information

Type Date Name Affiliation Comment
Reporter 10-JUN-2000 S.W. Nelson U.S. Geological Survey

Beyond USGS

Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.

Maps centered on this site

Authoritative Alaska resources

These are landing pages for further research — the state agencies don't currently expose per-mine deep links.