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  3. Mineral Resource Data System (MRDS)

Unnamed (on tributary valley to Happy River)

Occurrence in Alaska, United States with commodities Arsenic, Tungsten, Gold
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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. Alteration
  8. Mineral occurrence model information
  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 10307877
Record type Site
Current site name Unnamed (on tributary valley to Happy River)

Geographic coordinates

Geographic coordinates: -153.02181, 62.18649 (WGS84)
Relative position This unnamed occurrence is located on a steep, west-facing slope of a tributary valley to the Happy River. It is at about 4 kilometers southeast of Rainy Pass, at an elevation of 4,400 feet (1,341 m), in the NE1/4 sec. 7, T. 24 N., R. 20 W., of the Seward Meridian. The reporter visited the site in 1988; at station no. 88BT205.

Site location context

Political divisions (FIPS codes)

Bethel(Census area)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

McGrath A-1(quadrangle 1:63,360 scale)

McGrath SE(quadrangle 1:100,000 scale)

McGrath(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Yentna River(hydrologic unit)

Susitna River(hydrologic accounting unit)

South Central Alaska(hydrologic subregion)

Alaska(hydrologic region)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Arsenic Critical Primary
Tungsten Critical Primary
Gold Secondary

Materials information

Materials Type of material
Chalcopyrite Ore
Pyrite Ore
Quartz Gangue

Alteration

  • (Local) Sericite in intrusion.

Mineral occurrence model information

Model code 85
USGS model code 22c
Deposit model name Polymetallic veins
Mark3 model number 46

Nearby scientific data

(1) -153.02181, 62.18649
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = This unnamed occurrence consists of a chalcopyrite-bearing quartz vein in the contact aureole of a small composite hornblende-rich, granodiorite pluton that intrudes Lower Cretaceous Kahiltna Flysch (Bundtzen, Harris, and Gilbert, 1997). The undated pluton contains monzonite, granodiorite, and syenite phases with granodiorite predominates. The small intrusion covers an area of 100 meters by 200 meters; however, a 125 meter wide thermal aureole surrounds the intrusion, which suggests an enlarged body at depth. . Chalcopyrite-bearing quartz veins occur in the thermal aureole near the contact with the pluton. Chalcopyrite comprises no more than one percent of the total sulfides, which are dominated by pyrite. Three samples taken of the sulfide-vein mineralization contained an average 180 ppm tungsten, 200 ppm arsenic, and 250 ppm gold. The samples were not run for either lead or copper.

Economic information about the deposit and operations

Development status Occurrence

Comments on exploration

  • Status = Inactive

Mining district

District name McGrath

Comments on the workings information

  • Workings / Exploration = The reporter mapped the pluton as part of a Division of Geological and Geophysical Surveys mapping effort in 1988 (Bundtzen, Harris, and Gilbert, 1997). Three samples taken of sulfide-vein mineralization contained an average 180 ppm tungsten, 200 ppm arsenic, and 250 ppm gold. The samples were not analyzed for lead or copper.

Reference information

Comments on the references

  • Primary Reference = This description

General comments

Subject category Comment text
Deposit Model Name = Polymetallic vein (Cox and Singer, 1986; model 22c).

Reporter information

Type Date Name Affiliation Comment
Reporter 09-DEC-08 T.K. Bundtzen Pacific Rim Geological Consulting

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.