ASARCO

Prospect in Alaska, United States with commodities Copper, Molybdenum
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 10001755
MRDS ID A012541
Record type Site
Current site name ASARCO
Alternate or previous names Tok, Dennis
Related records 10304648

Geographic coordinates

Geographic coordinates: -142.51263, 63.36972 (WGS84)
Relative position The prospect is located on a north-facing hillside about 5 miles northeast of Tetlin Junction. It is at about 3000 feet of elevation, in section 3, T. 19 N., R. 15 E., of the Copper River Meridian. It is location 20 of Singer and others (1976), and locality 1 of Eberlein and others (1977). It lies about 3.5 miles north of Ladue Peak. The location is known to within a mile.

Site location context

Political divisions (FIPS codes)

Southeast Fairbanks(Census area)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Tanacross B-4(quadrangle 1:63,360 scale)

Tanacross SW(quadrangle 1:100,000 scale)

Tanacross C(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Alaska(hydrologic region)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Copper Primary
Molybdenum Primary

Materials information

Materials Type of material
Chalcopyrite Ore
Molybdenite Ore
Pyrite Ore

Alteration

  • (Local) Alteration types include severe silicification and leaching of the hypabyssal intrusive (Singer and others, 1976).

Mineral occurrence model information

Model code 79
USGS model code 21a
Deposit model name Porphyry Cu-Mo
Mark3 model number 2

Host and associated rocks

  • Host or associated Host
    Rock type Plutonic Rock > Granitoid > Quartz Monzonite

Nearby scientific data

(1) Kmgr

Economic information

Comments on the geologic information

  • Geologic Description = The ASARCO prospect consists of silicified and deeply leached Tertiary quartz porphyry hypabyssal intrusive and extrusive rocks that contain disseminated molybdenite and copper sulfide minerals (Singer and others, 1976). The regional geology of the prospect consists of Tertiary felsic volcanics surrounded by undivided granitic rocks (Foster, 1970). The prospect lies within the eastern Yukon-Tanana Y1 subterrane of Foster and Keith (1994). Cities Services Mineral Corp. drilled three holes in the prospect in 1971, and then dropped the project (David Hedderly-Smith, oral communication, 1998). A rhyolite flow near the ASARCO prospect yielded an age of 55-60 Ma (Newberry and others, 1996).
  • Age = Early Tertiary (55-60 Ma), based on the prospect's similarity to the Taurus prospect (TC027) and the Pushbush prospect (TC024) nearby, as well as a radiometric date on a rhyolite flow near the prospect (Newberry and others, 1996).

Economic information about the deposit and operations

Development status Prospect
Commodity type Metallic

Mining district

District name Fortymile

Comments on the workings information

  • Workings / Exploration = Surface sampling, some sampling and drilling in 1970 and 1971.

Reference information

Bibliographic references

Comments on the references

  • Primary Reference = Singer and others, 1976

General comments

Subject category Comment text
Deposit Model Name = Porphyry Cu deposit (Cox and Singer, 1986; model 21a)

Reporter information

Type Date Name Affiliation Comment
Reporter 13-APR-99 Cameron, C.E. Alaska Division of Geological and Geophysical Surveys

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.