Twin Lakes East

Occurrence in Alaska, United States with commodity Copper
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 10003609
MRDS ID A106367
Record type Site
Current site name Twin Lakes East

Geographic coordinates

Geographic coordinates: -153.70269, 60.71945 (WGS84)
Relative position Locality is on Peak 6,515 approximately 4.8 km NE of the eastern end of Twin Lakes. This is locality 12 of Nelson and others (1985) and locality 20 of MacKevett and Holloway (1977). Sec. 8, T. 7 N., R. 25 W., of the Seward Meridian. Locality is accurate to within 1.6 km.

Site location context

Political divisions (FIPS codes)

Lake and Peninsula(Borough)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Lake Clark C-2(quadrangle 1:63,360 scale)

Lake Clark NE(quadrangle 1:100,000 scale)

Lake Clark(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Mulchatna River(hydrologic unit)

Nushagak River(hydrologic accounting unit)

Southwest(hydrologic subregion)

Alaska(hydrologic region)

Federal lands

Lake Clark National Park(National Park)

National Park NPS(Type of land area)

NPS(Federal land areas administered by NPS)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Copper Primary

Materials information

Materials Type of material
Bornite Ore
Chalcopyrite Ore
Pyrrhotite Ore

Alteration

  • (Local) Unknown

Mineral occurrence model information

Model code 184
USGS model code 28a
Deposit model name Massive sulfide, kuroko
Mark3 model number 93
Model code 58
USGS model code 18a
Deposit model name Porphyry Cu, skarn-related
Mark3 model number 9

Host and associated rocks

  • Host or associated Host
    Rock type
    Stratigraphic age (youngest) Paleocene
    Chronological age 59.45
    Dating method K-Ar

Nearby scientific data

(1) -153.70269, 60.71945

Economic information

Comments on the geologic information

  • Geologic Description = Disseminated chalcopyrite, bornite, and associated pyrrhotite occur in mafic to intermediate metavolcanic rocks interbedded with marble (Nelson and others, 1985; 1983, unit Tvf). Nelson and others (1983) report small intrusive bodies that range in composition from granite to gabbro also occur in vicinity. Potassium-argon ages range from 56.2 to 62.7 m.y. (Eakins and others, 1978). ?
  • Age = The metavolcanic rocks that host the mineralization have potassium-argon ages, by D.L. Turner, that range from 56.2 to 62.7 m.y. (Eakins and others, 1983).
  • Age = Chron age is for metavolcanic rocks that host the mineralization.

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Bristol Bay

Comments on the production information

  • Production Notes = No production

Comments on the reserve resource information

  • Reserves = No reserves

Comments on the workings information

  • Workings / Exploration = Unknown

Reference information

Bibliographic references

Comments on the references

  • Primary Reference = Nelson and others, 1985

General comments

Subject category Comment text
Deposit Model Name = Kuroko massive sulfide ? or Porphyry Cu, skarn related ? (Cox and Singer, 1986; model 28a ? or 18a?)
Deposit Other Comments = Site is in Lake Clark National Park and Preserve.

Reporter information

Type Date Name Affiliation Comment
Reporter 15-JUN-1998 D.P. Bickerstaff 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.