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Green Spike

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

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).

Site location context

Political divisions (FIPS codes)

Matanuska-Susitna(Borough)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Healy A-4(quadrangle 1:63,360 scale)

Healy S(quadrangle 1:100,000 scale)

Healy C(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Upper Susitna River(hydrologic unit)

Susitna River(hydrologic accounting unit)

South Central Alaska(hydrologic subregion)

Alaska(hydrologic region)

Federal lands

BLM(Federal land areas administered by BLM)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Silver Primary
Copper Primary
Molybdenum Primary
Tin Critical Secondary
Zinc Critical 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
    Rock type
    Stratigraphic age (youngest) Oligocene

Nearby scientific data

(1) -148.88779, 63.0996
ListMap

Economic information

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 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

Bibliographic references

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

Beyond USGS

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

Maps centered on this site

Authoritative Alaska resources

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