Green Spike

Prospect in Alaska, United States with commodities Silver, Copper, Molybdenum, Tin, Zinc

Geologic information

Identification information

Deposit ID 10307563
Record type Site
Current site name Green Spike
Alternate or previous names Firecliff

Geographic coordinates

Geographic coordinates: -148.88779, 63.0996 (WGS84)
Relative position The Green Spike prospect is at an elevation of about 4,500 feet, at the southwest head of East Fork Chulitna River. The map site is about 2.75 miles east southeast of VABM 5854 (Alf), in the northwest corner of sec. 15, T. 21 S., R. 7 W., of the Fairbanks Meridian. The accuracy of this location is within 1,000 feet. This is locality D4 of Balen (1990: OFR 34-90).
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Silver Primary
Copper Primary
Molybdenum Primary
Tin Secondary
Zinc Secondary

Materials information

Materials Type of material
Cassiterite Ore
Chalcopyrite Ore
Molybdenite Ore
Pyrite Ore
Sphalerite Ore
Quartz Gangue

Mineral occurrence model information

Model code 76
USGS model code 20a
Deposit model name Porphyry Sn

Host and associated rocks

  • Host or associated Host
    Stratigraphic age (youngest) Oligocene

Nearby scientific data

(1) -148.88779, 63.0996

Comments on the geologic information

  • Geologic Description = The Green Spike prospect is at the contact between a Tertiary granitic pluton and a slightly younger (Oligocene) complex of hypabyssal felsic dikes and remnants of a rhyolite flow. Both the granite and younger complex cut Jurassic to Cretaceous metamorphosed graywacke. The deposit is in the rhyolite, and consists of quartz veins containing cassiterite, chalcopyrite, molybdenite, pyrite, and sphalerite. Samples assay 0.48% copper, 819 ppm zinc, 0.4 ounce of silver per ton, 13 ppm tin, and 25 ppm molybdenum (Balen and others, 1991). The high molybdenum-tin-silver values, the evolved intrusive host-rocks, and their younger age distinguish this deposit from the copper-gold-rich deposits on the other side of the Chulitna Valley (for example, HE043).
  • Age = Volcanic rocks hosting the deposit are considered Oligocene (Wilson and others, 1998).

Economic information

Economic information about the deposit and operations

Development status Prospect

Comments on exploration

  • Status = Inactive

Mining district

District name Valdez Creek

Comments on the workings information

  • Workings / Exploration = Surface sampling only.

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Alaska Resource Data File ARDF HE140

Bibliographic references

  • Deposit

    Balen, M.D., 1990, Geochemical sampling results from the Bureau of Mines Investigations in the Valdez Creek mining district, Alaska: U.S. Bureau of Mines Open-File Report 34-90, 218 p., 2 plates, scale 1:250,000.

  • Deposit

    Balen, M.D., and others, 1991, Executive summary of the Bureau of Mines investigations in the Valdez Creek mining district, Alaska: U.S. Bureau of Mines Special Publication, 43 p.

  • Deposit

    Wilson, F.H., Dover, J.H., Bradley, D.C., Weber, F.R., Bundtzen, T.K., and Haeussler, P.J., 1998, Geologic map of central (interior) Alaska: U.S. Geological Survey Open-File Report 98-133, 17 p., 2 sheetsm, scale 1:500,000.

Comments on the references

  • Primary Reference = Balen and others, 1991

General comments

Subject category Comment text
Deposit Model Name = Porphyry Sn (Cox and Singer, 1986; 20a)

Reporter information

Type Date Name Affiliation Comment
Reporter 07-APR-00 N. Van Wyck Stevens Exploration Management Corporation