Prospect in Alaska, United States with commodities Copper, Molybdenum

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.
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Geographic areas

Country State
United States Alaska


Commodity Importance
Copper Primary
Molybdenum Primary

Materials information

Materials Type of material
Chalcopyrite Ore
Molybdenite Ore
Pyrite Ore


  • (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) -142.51263, 63.36972

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

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

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A012541
USGS Alaska Resource Data File ARDF TC001

Bibliographic references

  • Deposit

    Foster, H.L., 1970, Reconnaissance geologic map of the Tanacross quadrangle, Alaska: U.S. Geological Survey Miscellaneous Geological Investigations Map I-593, 1 sheet, scale 1:250,000.

  • Deposit

    Singer, D.A., Csejtey, Bela, Jr., and Miller, R.J., 1978, Map and discussion of the metalliferous and selected nonmetalliferous mineral resources of the Talkeetna Mountains quadrangle, Alaska: U.S. Geological Survey Open-file Report 78-588-Q, 33 p., 1 plate, scale 1:250,000.

  • Deposit

    Eberlein, G.D., Chapman, R.M., Foster, H.L., and Gassaway, J.S., 1977, Map and table describing known metalliferous and selected nonmetalliferous mineral deposits in central Alaska: U.S. Geological Survey Open-File Report 77-168-D, 132 p., 1 map, scale 1:1,000,000.

  • Deposit

    Gill, R., 1977, Geology and mineral deposits of the southwest quarter of the Tanacross D-1 quadrangle, Alaska: Golden, Colorado School of Mines, M.Sc. thesis, 129 p.

  • Deposit

    Cobb, E.H., and Eberlein, G.D., 1980, Summaries of data on and lists of references to metallic and selected nonmetallic mineral deposits in the Big Delta and Tanacross quadrangles, Alaska: U.S. Geological Survey Open-File Report 80-1086, 77 p.

  • Deposit

    Nokleberg, W.J., Bundtzen, T.K., Berg, H.C., Brew, D.A., Grybeck, D.J., Robinson, M.S., Smith, T.E., and Yeend, W., 1987, Significant metalliferous lode deposits and placer districts of Alaska: U.S. Geological Survey Bulletin 1786, 104 p.

  • Deposit

    Newberry, R.J., Layer, P.W., Burleigh, R.E., and Solie, D.N., 1996, New 40Ar/39Ar dates for intrusions and mineral prospects in the eastern Yukon-Tanana terrane, Alaska - Regional patterns and significance, in Gray, J.E., and Riehle, J.R., eds., Geological Studies in Alaska by the U.S. Geological Survey, 1996: U.S. Geological Survey Professional Paper 1595, p. 131-159.

  • Deposit

    Foster, H.L., and Keith, T.E.C., 1994, Geology of the Yukon-Tanana area of east-central Alaska: in Plafker, G. and Berg, H.C., eds, The geology of North America, vol. G-1, The geology of Alaska: Geological Society of America, p. 205-240.

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