Miss Molly

Prospect in Alaska, United States with commodities Molybdenum, Lead, Zinc, Fluorine-Fluorite

Geologic information

Identification information

Deposit ID 10003496
MRDS ID A106253
Record type Site
Current site name Miss Molly

Geographic coordinates

Geographic coordinates: -152.07275, 61.7295 (WGS84)
Relative position Fernette and Cleveland (1984) locate the Miss Molly prospect on the north side of the Trimble River near the toe of the Trimble Glacier in Section 18, T. 19 N., R. 15 W. The area is mostly covered by glacial debris and dense vegetation, with good bedrock exposures along the Trimble River and in stream valleys (U.S. Bureau of Mines, 1998, MAS # 0020840031 and U.S. Bureau of Mines, 1973, localites 26 and 46). Location is known to within 100 yards.
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Molybdenum Primary
Lead Primary
Zinc Primary
Fluorine-Fluorite Secondary

Materials information

Materials Type of material
Galena Ore
Molybdenite Ore
Pyrite Ore
Sphalerite Ore
Fluorite Gangue
Quartz Gangue

Alteration

  • (Local) Quartz, sericite, clay, alunite? (Fernette and Cleveland, 1984).

Nearby scientific data

(1) -152.07275, 61.7295

Comments on the geologic information

  • Geologic Description = Fernette and Cleveland (1984) described the mineralization at Miss Molly as quartz veins with medium to coarse-grained molybdenite, pyrite, and local fluorite. Veins are regularly spaced, sub parallel, vary from 2 to 10 cm wide, and are spaced 2 to 10 m apart. Veins occur in two zones about 545 m long and up to 150 m wide in a leucocratic, equigranular biotite granite stock. Veins locally fill joints and less commonly shears. Hydrothermal alteration up to 0.3 m wide to sericite and pyrite, occurs adjacent to veins. Grab and chip samples contain up to 0.38% Mo, 0.16% Zn and 100 ppb Au. The granite stock intrudes Mesozoic marine sediments (KJs) of the Kahlitna terrane (Fernette and Cleveland, 1984 and Nokleberg and others, 1987). Reed and Lanphere (1972) report nearby granitic plutons with K-Ar ages of 56-59 m.y. and is probably the same age as the intrusion hosting the veins.
  • Age = Possibly related to dated Tertiary (59 - 56 m.y.) intrusions nearby. (Reed and Lanphere, 1972)

Economic information

Economic information about the deposit and operations

Development status Prospect
Commodity type Metallic

Comments on exploration

  • Status = Probably inactive

Mining district

District name Yentna

Comments on the reserve resource information

  • Reserves = Moderate size and grade (Fernette and Cleveland, 1984).

Comments on the workings information

  • Workings / Exploration = Exploration work included prospecting, rock chip geochemical sampling.

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A106253
USGS Alaska Resource Data File ARDF TY013

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

    Reed, B.L., and Lanphere, M.A., 1972, Generalized geologic map of the Alaska-Aleutian range batholith showing potassium-argon ages of the plutonic rocks: U.S. Geological Survey Miscellaneous Field Studies Map MF-372, 2 sheets, scale 1:1,000,000.

  • Deposit

    MacKevett, E.M., Jr., and Holloway, C.D., 1977, Map showing metalliferous and selected non-metalliferous mineral deposits in the eastern part of southern Alaska: U.S. Geological Survey Open-File Report 77-169-A, 99 p., 1 sheet, scale 1:1,000,000.

  • Deposit

    Hollister, V.F., 1978, Geology of the porphyry copper deposits of the Western Hemisphere; New York, Society of Mining Engineering, American Institute of Mining, Metallurgy, and Petroleum Engineers Incorporated, 218 p.

  • Deposit

    Nokleberg, W.J., Bundtzen, T.K., Berg, H.C., Brew, D.A., Grybeck, D.J., Robinson, M.S., Smith, T.E., and Yeend, W., 1987, Significant metalliferous lode deposits and placer districts of Alaska: U.S. Geological Survey Bulletin 1786, 104 p.

  • Deposit

    Fernette, Gregory, and Cleveland, Gaylord, 1984, Geology of the Miss Molly molybdenum prospect, Tyonek C-6 quadrangle, Alaska: Alaska Division of Geological and Geophysical Surveys Professional Report 86, p. 35-41.

  • Deposit

    U.S. Bureau of Mines, 1998, Minerals Availability System/Minerals Industry Location System (MAS/MILS), Talkeetna Quadrangle: Worldwide Web URL http://imcg.wr.usgs.gov/data.html.

Comments on the references

  • Primary Reference = Fernette and Cleveland, 1984

General comments

Subject category Comment text
Deposit Model Name = Mo-bearing quartz veins
Deposit Other Comments = the Miss Molly prospect is not a classic stockwork molybdenum- type occurrence.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JUN-1998 Madelyn A. Millholland Millholland & Associates
Reporter 01-JUN-1998 James Riehle U.S. Geological Survey