Prospect in Alaska, United States with commodities Silver, Gold, Bismuth

Geologic information

Identification information

Deposit ID 10094051
MRDS ID A012423
Record type Site
Current site name Stone
Alternate or previous names Stone Lode
Related records 10258697

Geographic coordinates

Geographic coordinates: -154.87988, 63.15254 (WGS84)
Relative position The Stone Lode prospect is located at an elevation of 1,250 feet (381 m) in Section 16, T. 27 S., R. 21 E., of the Kateel River Meridian. The reporter visited the site in 1989 and 1996.
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Geographic areas

Country State
United States Alaska


Commodity Importance
Silver Primary
Gold Primary
Bismuth Secondary

Materials information

Materials Type of material
Bismuth Ore
Chalcopyrite Ore
Gold Ore
Garnet Gangue
Magnetite Gangue


  • (Local) Tactite.

Mineral occurrence model information

Model code 59
USGS model code 18b
Deposit model name Skarn Cu
Mark3 model number 8

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Granitoid > Monzonite
    Stratigraphic age (youngest) Pliocene
    Stratigraphic age (youngest) Late Permian
  • Host or associated Host
    Rock type Sedimentary Rock > Carbonate > Limestone

Nearby scientific data

(1) -154.87988, 63.15254

Comments on the geologic information

  • Geologic Description = The Stone Lode prospect is a poorly known, but promising gold prospect in skarn near a limestone/monzonite contact; it is geologically very similar to Nixon Fork Mine (MD062). Mineralization consists of garnet-rich and wallastonite-idocrase-epidote skarn that replaces an Ordovician limestone near the margin of a small monzonite body that is currently undated.

Economic information

Economic information about the deposit and operations

Development status Prospect
Commodity type Metallic

Comments on exploration

  • Status = Active

Mining district

District name McGrath

Comments on the production information

  • Production Notes = Some modest production activities in the form of test shipments of high grade ore by the owner may have taken place (Ted Almasy, personal communication, 1998).

Comments on the workings information

  • Workings / Exploration = Only surface workings have been completed at the Stone Lode prospect. No assay data are available.

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A012423
USGS Alaska Resource Data File ARDF MD074

Bibliographic references

  • Deposit

    Berg, H.C., and Cobb, E.H., 1967, Metalliferous Lode Deposits of Alaska. U.S. Geological Survey Bulletin 1246, 254 p.

  • Deposit

    Patton, W.W., Jr., and Moll, E.J., 1983, Mineral resource assessment map of the Medfra quadrangle, Alaska: U.S. Geological Survey Open-File Report 80-811-G, 3 sheets, scale 1:250,000.

Comments on the references

  • Primary Reference = Berg and Cobb, 1967

General comments

Subject category Comment text
Deposit Model Name = Copper-gold skarn (Cox and Singer, 1986; model no. 18b)
Deposit Other Comments = See Nixon Fork Mine (MD062). The Stone prospect is on in part on land selected or conveyed to Doyon Ltd. For further information, contact Doyon Ltd. at 210 1st Ave., Fairbanks, Alaska, 99701.

Reporter information

Type Date Name Affiliation Comment
Reporter 07-JUN-98 Bundtzen, T.K. Pacific Rim Geological Consulting