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Mother Lode

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

Identification information

Deposit ID 10002932
MRDS ID A015424
Record type Site
Current site name Mother Lode

Geographic coordinates

Geographic coordinates: -147.46602, 65.04968 (WGS84)
Relative position Cobb (1972, MF-413), loc. 37; NW1/4 sec. 36, T. 3 N., R. 1 E., of the Fairbanks Meridian. This prospect is on the ridge at the head of Willow Creek, about a mile WNW of Cleary Summit. Accuracy is within 2,500 feet.
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Gold Primary
Antimony Secondary

Materials information

Materials Type of material
Gold Ore
Stibnite Ore

Alteration

  • (Local) Stibnite aggregates are highly oxidized and sericite alteration was observed in the granite porphyry dike.

Mineral occurrence model information

Model code 180
USGS model code 27d
Deposit model name Simple Sb (veins, pods, etc)

Host and associated rocks

  • Host or associated Host
    Rock type Metamorphic Rock > Schist > Mica Schist

Nearby scientific data

(1) -147.46602, 65.04968
ListMap

Comments on the geologic information

  • Geologic Description = The prospect consists of a sericitized granite porphyry dike which cuts a stibnite-bearing schist. The stibnite occurs as pods and veinlets in the schist and as a surface coating on the dike contact (Prindle, 1910). Specimens of ore from this deposit are made up of a granular aggregate of stibnite (Brooks, 1916, p. 33; B 649). The aggregates are highly weathered, and a little pyrite occurs with the stibnite. There are also some vitreous quartz grains buried in the stibnite; some of these grains showed crystal terminations (Brooks, 1916, p. 33; B 649).? the stibnite contains less that $1 per ton in gold (0.05 ounces of gold per ton) but the grade of the granite porphyry is unknown. The prospect was idle in 1916 and was noted to be associated with a horizontal structure which may have been parallel to foliation (Brooks, 1916; B 649). The Mother Lode prospect was examined as a possible source of antimony in 1942 but no additional exploration was conducted due to insufficient tonnage potential (Killeen and Mertie, 1951).

Economic information

Economic information about the deposit and operations

Development status Prospect
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Fairbanks

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A015424
USGS Alaska Resource Data File ARDF LG094

Bibliographic references

  • Deposit

    Brooks, A.H., 1916, Antimony deposits of Alaska: U.S. Geological Survey Bulletin 649, 67 p.

  • Deposit

    Killeen, P.L., and Mertie, J.B., 1951, Antimony ore in the Fairbanks District, Alaska: U.S. Geological Survey Open-File Report 51-46, 43 p.

  • Deposit

    Chapman, R.M., and Foster, R.L., 1969, Lode mines and prospects in the Fairbanks district, Alaska: U.S. Geological Survey Professional Paper 625-D, 25 p., 1 plate.

  • Deposit

    Cobb, E.H., 1976, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Circle quadrangle, Alaska: U.S. Geological Survey Open-File Report 76-633, 72 p.

  • Deposit

    Freeman, C.J., 1992, 1991 Golden Summit project final report, volume 2: Historical summary of lode mines and prospects in the Golden Summit project area, Alaska: Avalon Development Corp., 159 p. (Report held by Freegold Recovery Inc. USA, Vancouver, British Columbia.)

  • Deposit

    Cobb, E.H., 1976, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Livengood quadrangle, Alaska: U.S. Geological Survey Open-File Report 76-819, 241 p.

  • Deposit

    Prindle, L.M., 1910, Auriferous quartz veins in the Fairbanks district: U.S. Geological Survey Bulletin 442-F, p. 210-229.

  • Deposit

    Cobb, E.H., 1972, Metallic mineral resources map of the Livengood quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-413, 2 sheets, scale 1:250,000.

Comments on the references

  • Primary Reference = Brooks, 1916 (B 649)

General comments

Subject category Comment text
Deposit Model Name = Stibnite vein (Cox and Singer; model 27d).

Reporter information

Type Date Name Affiliation Comment
Reporter 04-MAY-1999 C.J. Freeman Avalon Development Corporation
Reporter 04-MAY-1999 J.R. Guidetti Schaefer Avalon Development Corporation