Unnamed (near Devilfish Bay)

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

Geologic information

Identification information

Deposit ID 10000299
MRDS ID A010344
Record type Site
Current site name Unnamed (near Devilfish Bay)
Related records 10282627

Geographic coordinates

Geographic coordinates: -133.39075, 56.08473 (WGS84)
Relative position Prospect near the head of Devilfish Bay, northwest Kosciusko, in the NW1/4, section 8, T. 67 S., R. 78 E.

Site location context

Political divisions (FIPS codes)

Prince of Wales-Hyder(Census area)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Petersburg A-5(quadrangle 1:63,360 scale)

Petersburg S(quadrangle 1:100,000 scale)

Petersburg(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Prince of Wales(hydrologic unit)

Southern Southeast Alaska(hydrologic accounting unit)

Southeast Alaska(hydrologic subregion)

Alaska(hydrologic region)

Federal lands

Tongass 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
Molybdenum Primary
Uranium Primary

Comments on the commodity information

  • Gangue = Calcsilicate minerals in tactite

Materials information

Materials Type of material
Chalcopyrite Ore
Magnetite Ore
Molybdenite Ore

Alteration

  • (Local) Calcsilicate minerals associated with intrusion of quartz monzonite into calcareous rocks.

Mineral occurrence model information

Model code 59
USGS model code 18b
Deposit model name Skarn Cu
Mark3 model number 8

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Mafic Intrusive Rock > Diorite
  • Host or associated Host
    Rock type Metamorphic Rock > Skarn (Tactite)

Nearby scientific data

(1) -133.39075, 56.08473

Economic information

Comments on the geologic information

  • Geologic Description = Magnetite, chalcopyrite, and minor molybdenite occur in tactite at contact between a Cretaceous quartz monzonite pluton and Cretaceous hornfels formed from calcareous graywacke of the Silurian Bay of Pillars Formation (Herreid and Kaufman, 1964, p. 4; Eakins, 1975, p. 54-57; and Brew and others, 1984). One sample of the tactite contained 8 ppm equivalent uranium.
  • Age = Related to intrusion of Cretaceous quartz monzonite pluton.

Economic information about the deposit and operations

Development status Prospect
Commodity type Metallic

Comments on exploration

  • Status = Probably inactive

Mining district

District name Ketchikan

Comments on the production information

  • Production Notes = None

Comments on the reserve resource information

  • Reserves = None

Comments on the workings information

  • Workings / Exploration = Only work noted in 1975 was a single, hand-dug pit; little indication of any work since. But see PE053 for several blocks of claims staked around this prospect and active through at least 1981.

Reference information

Bibliographic references

Comments on the references

  • Primary Reference = Herreid and Kaufman, 1964

General comments

Subject category Comment text
Deposit Model Name = Cu-Mo skarn with uranium?(Cox and Singer, 1986; model 18b)

Reporter information

Type Date Name Affiliation Comment
Reporter 01-NOV-1998 H.C. Berg U.S. Geological Survey
Reporter 01-NOV-1998 D.J. Grybeck U.S. Geological Survey

Beyond USGS

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

Authoritative Alaska resources

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