Unnamed Skarn

Occurrence in Alaska, United States with commodities Tin, Tungsten

Geologic information

Identification information

Deposit ID 10001511
MRDS ID A012258
Record type Site
Current site name Unnamed Skarn
Alternate or previous names Near Lime Peak Rocky Mountain

Geographic coordinates

Geographic coordinates: -146.65578, 65.62749 (WGS84)
Relative position SEE LOCATION COMMENTS
(click for info)

Geographic areas

Country State
United States Alaska

Comments on the location information

  • 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.

Commodities

Commodity Importance
Tin Primary
Tungsten Secondary

Materials information

Materials Type of material
Scheelite Ore
Magnetite Gangue
Pyroxene Gangue
Pyrrhotite Gangue

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
    Stratigraphic age (youngest) Paleocene
    Stratigraphic age (youngest) Paleocene
  • Host or associated Host
    Rock type Sedimentary Rock > Carbonate > Limestone

Nearby scientific data

(1) -146.65578, 65.62749

Economic information

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic
Deposit size Small
Significant No

Comments on exploration

  • Status = Inactive

Mining district

District name Tolovana

Comments on the workings information

  • SURFACE SAMPLES TAKEN.

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A012258
USGS Alaska Resource Data File ARDF CI085
USGS Mineral Resources Data System MRDS A012257

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., 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.

  • Other Database

    BAG-OFR-83-170B-28

General comments

Subject category Comment text
Deposit SKARNS/CALC-SILICATE ROCKS ARE NOT OF CURRENT OR LIKELY FUTURE ECONOMIC INTEREST.
Deposit SEE ALSO: LIME PEAK PLUTON ; INFO.SRC : 1 PUB LIT; 2 UNPUB REPT
Deposit THIS SITE NAME WAS CREATED BY THE REPORTER OR OTHER USGS EMPLOYEE BASED ON PROXIMITY TO SOME MAJOR GEOGRAPHIC FEATURE.
Deposit 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

Reporter information

Type Date Name Affiliation Comment
Reporter 01-AUG-1986 Leonard, Kenneth R. (Elliott, R. L.) U.S. Geological Survey
Updater 01-SEP-1998 C.J. Freeman, J.R. Guidetti Schaefer, A.S. Clements Avalon Development Corporation