Unnamed (east of Billy Hawk Creek)

Occurrence in Alaska, United States with commodities Silver, Copper, Lead

Geologic information

Identification information

Deposit ID 10003071
MRDS ID A015596
Record type Site
Current site name Unnamed (east of Billy Hawk Creek)
Related records 10209079

Geographic coordinates

Geographic coordinates: -157.51336, 66.2495 (WGS84)
Relative position This occurrence is at an elevation of about 2,500 feet on an east-trending ridge, about 1.5 mile east of Billy Hawk Creek. The map site is in section 24, T. 10 N., R. 6 E., of the Kateel River Meridian. Cobb (1972, MF-448), locations 3 and 4.
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Silver Primary
Copper Primary
Lead Primary

Comments on the commodity information

  • Ore Material = argentiferous galena

Materials information

Materials Type of material
Silver Ore
Chalcopyrite Ore
Malachite Ore
Pyrite Ore
Galena Ore
Quartz Gangue

Alteration

  • (Local) Pyrite is almost completely oxidized to limonite.

Mineral occurrence model information

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

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Granitoid > Quartz Monzonite
  • Host or associated Host
    Rock type Volcanic Rock (Aphanitic) > Felsic Volcanic Rock > Quartz Latite

Nearby scientific data

(1) -157.51336, 66.2495

Comments on the geologic information

  • Geologic Description = Bedrock in the area of this occurrence consists of andesitic volcanic rocks of Late Jurassic-Early Cretaceous age, and quartz latite volcanic rocks of Late Cretaceous age, both of which are intruded by the Late Cretaceous Hawk River quartz monzonite. The older andesitic volcanics are thermally metamorphosed in the vicinity of the Hawk River pluton. Numerous fine-grained, pyritiferous, felsic dikes cut both the andesitic and quartz latite volcanics throughout this area. Pyrite-bearing, milky-white, vuggy, quartz veins cut the volcanics in a northwest-trending belt about 6.5 miles long by 1.5 mile wide. This belt parallels a zone of prominent, northwest-trending lineations and faults. The veins are narrow, appear to strike NE and dip steeply to the north. Locally they contain irregular segregations of argentiferous galena along with lesser chalcopyrite and malachite. Pyrite occurs in cubes up to one inch on a side and is almost completely oxidized to limonite. The galena is fresh and fills vugs and fissures along the edges of the veins. No galena or chalcopyrite were found in the volcanics, although the andesitic wallrock locally contains abundant pyrite. Grab samples contained up to 200 ppm Ag, 0.3 ppm Au, 3,000 ppm Cu, 20,000 ppm Pb, and 1,500 ppm Zn (Miller and Ferrians, 1968).
  • Age = Late Cretaceous or younger.

Economic information

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Shungnak

Comments on the workings information

  • Workings / Exploration = The area was mapped by Miller and others (1966). Six rock samples and sixteen stream sediment samples were collected and analyzed by Miller and Ferrians (1968) during their field investigations. One hundred and fifty lode claims were staked in 1972 (Grybeck, 1977).

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A015596
USGS Alaska Resource Data File ARDF SH005

Bibliographic references

  • Deposit

    Miller, T.P., Patton, W.W., and Lanphere, M.A., 1966, Preliminary report on a plutonic belt in west-central Alaska, in Geological Survey research in 1966: U.S. Geological Survey Professional Paper 550-D, p. D158-D162.

  • Deposit

    Miller, T.P. and Ferrians, O.J., Jr., 1968, Suggested areas for prospecting in the central Koyukuk River region, Alaska: U.S. Geological Survey Circular 570, 12 p.

  • Deposit

    Cobb, E.H., 1972, Metallic mineral resources of the Shungnak quadrangle, Alaska: USGS Miscellaneous Field Studies Map MF-448, 1 sheet, scale 1:250,000.

  • Deposit

    Cobb, E.H., 1975, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in five quadrangles in west central Alaska (Hughes, Kotzebue, Melozitna, Selawik and Shungnak): U.S. Geological Survey Open-File Report 75-627, 58 p.

  • 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

    Grybeck, D.J., 1977, Known mineral deposits of the Brooks Range, Alaska: US Geological Survey Open-File Report 77-166C, 41 p., 1 sheet, scale 1:1,000,000.

  • Deposit

    Cobb, E.H., 1975, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in five quadrangles in west central Alaska (Hughes, Kotzebue, Melozitna, Selawik, Shungnak): U.S. Geological Survey Open-File Report 75-627, 58 p.

Comments on the references

  • Primary Reference = Miller and Ferrians, 1968

General comments

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

Reporter information

Type Date Name Affiliation Comment
Reporter 16-DEC-99 Williams, Anita U.S. Geological Survey