Unnamed (west of Awlinyak Creek)

Occurrence in Alaska, United States with commodities Silver, Bismuth, Copper, Tin, Fluorine-Fluorite

Geologic information

Identification information

Deposit ID 10308328
Record type Site
Current site name Unnamed (west of Awlinyak Creek)

Geographic coordinates

Geographic coordinates: -154.45646, 67.4886 (WGS84)
Relative position This site is at an elevation of about 4300 feet near the headwaters of an unnamed creek 3 miles west of Awlinyak Creek. It is in the SE1/4 of sec. 8, T. 24 N., R. 20 E., of the Kateel River Meridian. Accuracy of the location is within 1000 ft. The site corresponds to locality 31 of Grybeck and Nelson (1981).
(click for info)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Silver Primary
Bismuth Primary
Copper Primary
Tin Primary
Fluorine-Fluorite Secondary

Materials information

Materials Type of material
Chalcopyrite Ore
Fluorite Ore
Malachite Ore

Mineral occurrence model information

Model code 43
USGS model code 14b
Deposit model name Sn skarn

Nearby scientific data

(1) -154.45646, 67.4886

Comments on the geologic information

  • Geologic Description = This occurrence consists of locally prominent copper staining in several cliffs near the contact of Devonian gneissic granite with Paleozoic chlorite schist and quartzite (Grybeck and Nelson, 1981). Grab samples that had visible fluorite and chlorite contained up to 3 ppm Ag, 300 ppm Bi, and 100 ppm Sn. A brief examination suggests that the occurrences are erratic and small. They probably are similar in origin to other Devonian contact-metamorphic deposits in nearby areas of the Brooks Range (Newberry and others, 1986).
  • Age = Devonian; related to the intrusion of Devonian pluton.

Economic information

Economic information about the deposit and operations

Development status Occurrence

Comments on exploration

  • Status = Inactive

Mining district

District name Koyukuk

Comments on the workings information

  • Workings / Exploration = Site examined during regional geologic mapping by the USGS in the late 1970s.

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Alaska Resource Data File ARDF SP014

Bibliographic references

  • Deposit

    Grybeck, D.J., and Nelson, S.W., 1981, Mineral deposit map of the Survey Pass quadrangle, Brooks Range, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-1176-F, 1 sheet, scale 1:250,000.

  • Deposit

    Newberry, R.J., Dillon, J.T., and Adams, D.D., 1986, Regionally metamorphosed calc-silicate-hosted deposits of the Brooks Range, northern Alaska: Economic Geology, v. 81, p. 1728-1752

Comments on the references

  • Primary Reference = Grybeck and Nelson, 1981

General comments

Subject category Comment text
Deposit Model Name = Skarn (Cox and Singer, 1986; model 14b)
Deposit Other Comments = Located within Gates of the Arctic National Park.

Reporter information

Type Date Name Affiliation Comment
Reporter 20-SEP-99 S.W. Nelson U.S. Geological Survey