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Unnamed skarn, near Lime Peak (Rocky Mountain)

Occurrence in Alaska, United States with commodities Tin, Silver, Uranium, Tungsten, Zinc
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Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Commodities
  6. Materials information
  7. Alteration
  8. Mineral occurrence model information
  9. Nearby scientific data
  10. Economic information about the deposit and operations
  11. Mining district
  12. Links to other databases
  13. Bibliographic references
  14. General comments
  15. Reporter information

Geologic information

Identification information

Deposit ID 10308820
MRDS ID A012258
Record type Site
Current site name Unnamed skarn, near Lime Peak (Rocky Mountain)
Related records 10001511

Geographic coordinates

Geographic coordinates: -146.656, 65.62771 (WGS84)
Relative position The location is the site of samples of skarn and greisen taken by Burton and others (1985). Lime Peak, also known 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 30 miles to the southeast and existing winter trails extend from it into the area.

Site location context

Political divisions (FIPS codes)

Yukon-Koyukuk(Census area)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Circle C-6(quadrangle 1:63,360 scale)

Circle NW(quadrangle 1:100,000 scale)

Circle(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Alaska(hydrologic region)

Federal lands

Steese National Conservation Area(National Conservation Area)

National Conservation Area BLM(Type of land area)

BLM(Federal land areas administered by BLM)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Tin Critical Primary
Silver Secondary
Uranium Secondary
Tungsten Critical Secondary
Zinc Critical Secondary

Comments on the commodity information

  • Ore Material = unknown Sn mineral

Materials information

Materials Type of material
Pyrrhotite Ore
Scheelite Ore

Alteration

  • Fe-rich skarn

Mineral occurrence model information

Model code 43
USGS model code 14b
Deposit model name Sn skarn

Nearby scientific data

(1) -146.656, 65.62771
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = Anomalous metal concentrations in rock samples collected from the Lime Peak area are associated with two styles of mineralization: skarn, developed near the contact zone of the Lime Peak pluton; and greisen, developed within the Lime Peak pluton (Burton and others, 1985, p. 15). Samples of skarn, collected from near the northern and southeastern intrusive contacts contain elevated to anomalous concentrations of tin and tungsten. The highest values were detected in iron-stained, magnetite-pyrrhotite-pyroxene skarn rubble, with one sample containing 220 ppm Sn and 100 ppm W (Burton and others, 1985, p.15). Smith and others (1987), analyzed bulk samples of calc-silicate rocks in this area with resulting grades of 0.003 to 0.03 oz/ton Sn, 0.03 to 0.1 oz/ton Ag, 0.01 to 0.03 % Cu, and 0.03 to 0.8 % Zn. Because of the low abundance of carbonate rocks in the area and the considerable distance from known mineralizing granite units, Smith and others (1987) conclude that the Lime Peak area skarns/calc-silicate rocks are not of current or likely future economic interest.
  • Age = Mineralization is related to Tertiary and/or Upper Cretaceous granitic plutons.

Economic information about the deposit and operations

Development status Occurrence
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

Bibliographic references

  • 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.

Comments on the references

  • Primary Reference = Burton and others, 1985; Smith and others, 1987.

General comments

Subject category Comment text
Deposit Model Name = Sn skarn and Sn greisen (Cox and Singer, 1986; model 14b and 15c)

Reporter information

Type Date Name Affiliation Comment
Reporter 09-SEP-1998 C.J. Freeman, J.R. Guidetti Schaefer, A.S. Clements Avalon Development Corporation

Beyond USGS

Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.

Maps centered on this site

Authoritative Alaska resources

These are landing pages for further research — the state agencies don't currently expose per-mine deep links.