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Jarosa Ridge

Prospect in Alaska, United States with commodities Gold, Arsenic, Antimony
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Geologic information

Identification information

Deposit ID 10307992
Record type Site
Current site name Jarosa Ridge

Geographic coordinates

Geographic coordinates: -165.48859, 64.70478 (WGS84)
Relative position This prospect is at an elevation of about 1,150 feet on the ridge crest trending west from Jarosa Creek valley. Jarosa Creek is a north tributary to Bangor Creek. The map location is in the SW1/4 section 16, T. 9 S., R. 34 W., Kateel River Meridian. The location is accurate to within about 500 feet.
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Gold Primary
Arsenic Secondary
Antimony Secondary

Materials information

Materials Type of material
Arsenopyrite Ore
Gold Ore
Stibnite Ore
Quartz Gangue

Alteration

  • (Local) Silicification.

Mineral occurrence model information

Model code 273
USGS model code 36a
Deposit model name Low-sulfide Au-quartz vein
Mark3 model number 27

Nearby scientific data

(1) -165.48859, 64.70478
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Comments on the geologic information

  • Geologic Description = This is an old prospect that has apparently not been previously reported. Workings consist of at least six prospect pits or shallow shafts. A local soil geochemical survey in the 1990's found as much as 990 ppb gold, greater than 10,000 ppm arsenic, and as much as 63 ppm antimony (Kennecott Exploration Company, written communication, 1992). Bedrock in this area was mapped as calc- and chlorite-rich metaturbidite schist by Bundtzen and others (1994).
  • Age = Not known; probably mid-Cretaceous or younger, similar to other gold lodes near Nome.

Economic information

Economic information about the deposit and operations

Development status Prospect

Comments on exploration

  • Status = Inactive

Mining district

District name Nome

Comments on the workings information

  • Workings / Exploration = Six shallow shafts or prospect pits were dug before 1918, probably during the same period as prospecting near Twin Mountains Creek (Mertie, 1918 [B 662-I, p. 425-449]). The area was mapped and a local soil geochemical survey completed by Kennecott Exploration Company in 1991.

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Alaska Resource Data File ARDF NM193

Bibliographic references

  • Deposit

    Bundtzen, T.K., Reger, R.D., Laird, G.M., Pinney, D.S., Clautice, K.H., Liss, S.A., and Cruse, G.R., 1994, Progress report on the geology and mineral resources of the Nome mining district: Alaska Division of Geological and Geophysical Surveys, Public Data-File 94-39, 21 p., 2 sheets, scale 1:63,360.

Comments on the references

  • Primary Reference = This report

General comments

Subject category Comment text
Deposit Model Name = Possibly low sulfide, Au-quartz veins (Cox and Singer, 1986; model 36a).

Reporter information

Type Date Name Affiliation Comment
Reporter 10-JUL-00 Hawley, C.C. and Hudson, Travis L. Hawley Resource Group