Unnamed Skarn

The Unnamed Skarn is a tin mine located in Alaska.

About the MRDS Data:

All mine locations were obtained from the USGS Mineral Resources Data System. The locations and other information in this database have not been verified for accuracy. It should be assumed that all mines are on private property.

Mine Info

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Site Name

Primary: Unnamed Skarn
Secondary: Near Lime Peak Rocky Mountain

Commodity

Primary: Tin
Secondary: Tungsten

Location

State: Alaska
District: Tolovana

Land Status

Not available

Holdings

Not available

Workings

Not available

Ownership

Not available

Production

Not available

Deposit

Record Type: Site
Operation Category: Occurrence
Operation Type: Unknown
Years of Production:
Organization:
Significant: N
Deposit Size: S

Physiography

Not available

Mineral Deposit Model

Not available

Orebody

Not available

Structure

Not available

Alterations

Not available

Rocks

Name: Granite
Role: Associated
Age Type: Associated Rock Unit
Age Young: Paleocene

Name: Granite
Role: Associated
Age Type: Associated Rock
Age Young: Paleocene

Analytical Data

Not available

Materials

Ore: Scheelite
Gangue: Magnetite
Gangue: Pyrrhotite
Gangue: Pyroxene

Comments

Comment (Location): 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.

Comment (Deposit): SKARNS/CALC-SILICATE ROCKS ARE NOT OF CURRENT OR LIKELY FUTURE ECONOMIC INTEREST.

Comment (Workings): SURFACE SAMPLES TAKEN.

Comment (Deposit): SEE ALSO: LIME PEAK PLUTON ; INFO.SRC : 1 PUB LIT; 2 UNPUB REPT

Comment (Deposit): THIS SITE NAME WAS CREATED BY THE REPORTER OR OTHER USGS EMPLOYEE BASED ON PROXIMITY TO SOME MAJOR GEOGRAPHIC FEATURE.

Comment (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

Comment (Exploration): Status = Inactive

References

Reference (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.

Reference (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.

Reference (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.

Reference (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.

Reference (Other Database): BAG-OFR-83-170B-28

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