Unnamed, near Lime Peak Pluton (Rocky Mountain)

Prospect in Alaska, United States with commodities Tin, Silver, Copper, Molybdenum, Uranium, Tungsten, Zinc

Geologic information

Identification information

Deposit ID 10001498
MRDS ID A012245
Record type Site
Current site name Unnamed, near Lime Peak Pluton (Rocky Mountain)
Related records 10209513, 10281605

Geographic coordinates

Geographic coordinates: -146.703, 65.63471 (WGS84)
Relative position The location given is the approximate center of tin mineralization within the Lime Peak pluton. It is about 1.6 mi due east of VABM Mascot. Lime Peak, also identified more recently as 'Rocky Mountain' is approximately 58 miles northeast of Fairbanks in the White Mountains. There is no road access to the area. The Steese Highway is located 30 miles to the southeast and existing winter trails extend from it into the area.
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Geographic areas

Country State
United States Alaska


Commodity Importance
Tin Primary
Silver Secondary
Copper Secondary
Molybdenum Secondary
Uranium Secondary
Tungsten Secondary
Zinc Secondary

Materials information

Materials Type of material
Cassiterite Ore
Chalcopyrite Ore
Molybdenite Ore
Pyrite Ore
Chlorite Gangue
Fluorite Gangue
Quartz Gangue
Sericite Gangue
Topaz Gangue
Tourmaline Gangue


  • (Local) Deuteric: tourmalization; hydrothermal: chloritization, sericitization, silicification.

Mineral occurrence model information

Model code 49
USGS model code 15c
Deposit model name Sn greisen

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Granitoid > Granite
    Rock unit name Lime Peak Pluton
    Rock description Lime Peak Pluton
  • Host or associated Host
    Rock type Plutonic Rock > Granitoid > Granite

Nearby scientific data

(1) -146.703, 65.63471

Comments on the geologic information

  • Geologic Description = The Lime Peak pluton is one of five lower Tertiary and/or Upper Cretaceous plutons exposed in the White Mountains (Foster and others, 1983). The Lime Peak pluton is a composite intrusion comprising at least three plutonic phases cut by two sets of north-trending dikes (Burton and others, 1985). The most abundant rock type is medium- to coarse-grained, equigranular to porphyritic, biotite granite that contains approximately 35 percent smoky quartz, 40 percent orthoclase, 20 percent albitic plagioclase, 5 percent biotite and trace to minor amounts of fluorite, apatite and zircon. Plagioclase, quartz and biotite occur as subhedral, embayed crystals surrounded by larger anhedral orthoclase phenocrysts. This unit commonly forms tors that line ridgetops in the Lime Peak area. The second most abundant intrusive phase is leucocratic, fine-grained, hypidiomorphic granular, seriate biotite granite that is found along the margins of, and in scattered outcrops within, the Lime Peak pluton. the third unit is a small body of moderately coarse-grained equigranular muscovite granite composed of approximately 40 percent smoky quartz, 30 percent albitic plagioclase, 25 percent orthoclase, 4 percent muscovite, up to 2 percent tourmaline, and minor amounts of fluorite. This third unit outcrops at the southwestern end of the Lime Peak pluton. The Lime Peak pluton intrudes metasedimentary rocks, dominantly quartzite and argillite, of Precambrian and/or Paleozoic age (Burton and others, 1985). Wilson and Shew (1981) obtained a K-Ar age of 56.7 m.a. for the granite, which intrudes sandstone, shale, and slate. The intrusion is exposed over 2500 vertical ft, and forms abundant rubble above 3500 ft elevation.? High tin values are concentrated in intensely altered biotite granite. Numerous occurrences of fault-controlled, tin-bearing greisen have been identified. The greisen is composed of quartz, chlorite, sericite, and minor amounts of fluorite, tourmaline, topaz, pyrite, chalcopyrite, and molybdenite; samples contain between 60 and 1560 ppm tin (Burton and others, 1985). Seven samples from separate occurrences along the ridge in section 3, T. 9 N., R. 5 E. (Warner and others, 1988) contained an average of 610 ppm Sn and 2.36 ppm Ag with values ranging from 220 to 1000 ppm Sn and 0.37 to 4.84 ppm Ag. Warner and others (1988) also collected samples of greisen in the Lime Peak area that contain up to 7100 ppm Sn, as well as locally anomalous concentrations of arsenic, beryllium, boron, columbium, copper, gold, iron, lead, lithium, manganese, silver, strontium, tungsten, uranium and zinc.
  • Age = Mineralization is related to Tertiary and/or Upper Cretaceous granitic plutons.

Economic information

Economic information about the deposit and operations

Development status Prospect
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Tolovana

Comments on the workings information

  • Workings / Exploration = Surface samples taken.

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A012245
USGS Alaska Resource Data File ARDF CI079

Bibliographic references

  • Deposit

    Wilson, F.H., and Shew, N., 1981, Map and tables showing preliminary results of potassium-argon age studies in the Circle Quadrangle, Alaska, with a compilation of earlier dating work: U.S. Geological Survey Open-File Report 81-889, 1 sheet, scale 1:250,000.

  • Deposit

    Foster, H.L., Laird J., Keith T.E.C., Cushing, G.W., and Menzie, W.D., 1983, Preliminary geologic map of the Circle quadrangle, Alaska: U.S. Geological Survey Open-File Report 83-170-A, 1 sheet, scale 1:250,000.

  • Deposit

    Menzie, W.D., Foster, H.L., Tripp, R.B., and Yeend, W.E., 1983, Mineral resource assessment of the Circle quadrangle, Alaska: U.S. Geological Survey Open-File Report 83-170-B, 61 p., 1 sheet, 1:250,000.

  • Deposit

    Burton, P.J., Warner, J.D., and Barker, J.C., 1985, Reconnaissance investigation of tin occurrences at Rocky Mountain (Lime Peak), east-central Alaska: U.S. Bureau of Mines Open-File Report 31-85, 44 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

    Smith, T.E., Pessel, G. H., and Wiltse, M.A., 1987, Mineral assessment of the Lime Peak-Mt. Prindle area, Alaska: Alaska Division of Geological and Geophysical Surveys Miscellaneous Paper 29, 712 p., scale 1:63,360.

  • Deposit

    Warner J.D., Dahlin, D.C., and Brown, L.L., 1988, Tin occurrences near Rocky Mountain (Lime Peak), east-central Alaska: U.S. Bureau of Mines Information Circular 9180, 24 p.

  • Deposit

    Menzie, W.D., Hua, Renmin, and Foster, H.L., 1987, Newly located occurrences of lode gold near Table Mountain, Circle quadrangle, Alaska: U.S. Geological Survey Bulletin 1682, 13 p.

Comments on the references

  • Primary Reference = Burton and others, 1985.

General comments

Subject category Comment text
Deposit Model Name = Sn Greisen (Cox and Singer, 1986; model 15c)
Deposit Other Comments = the name 'Lime Peak' has been changed to 'Rocky Mountain' on recent topographic maps; however, most literature refers to the peak as 'Lime Peak'.

Reporter information

Type Date Name Affiliation Comment
Reporter 22-JUN-98 C.J. Freeman Avalon Development Corporation
Reporter 22-JUN-98 J.R. Guidetti Schaefer Avalon Development Corporation
Reporter 22-JUN-98 Clements, A.S. Avalon Development Corporation