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Fat Chance

Occurrence, Active

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Commodities and mineralogy

Main commodities Mo
Other commodities Sb; W
Ore minerals molybdenite; pyrite; scheelite; stibnite
Gangue minerals sericite

Geographic location

Quadrangle map, 1:250,000-scale MH
Quadrangle map, 1:63,360-scale B-6
Latitude 63.2508
Longitude -146.8292
Nearby scientific data Find additional scientific data near this location
Location and accuracy The Fat Chance occurrence is located 2.1 miles west of the West Fork Maclaren River within the Stellar Project; 0.2 mile south of the center of section 20, T. 20 S., R. 5 E., of the Fairbanks Meridian. This location is accurate to within about 100 feet.

Geologic setting

Geologic description

Fat Chance is a molybdenum occurrence, in the Stellar Project area, related to a feldspar porphyry intruding quartz monzonite (P. St. George, Chief Exploration Officer, Millrock Resources Inc., oral communication, 2014). The Stellar Project area straddles the Yukon-Tanana and Wrangellia terranes (Millrock Resources Inc., 2014).
From 2011 to 2013, Millrock Resources Inc. conducted soil and rock sampling. In 2013, airborne electromagnetic geophysical survey and spectrometry were flown (Philip. St. George, Chief Exploration Officer, Millrock Resources Inc., oral communication, 2014).
Geologic map unit (, )
Mineral deposit model Porphyry molybdenum? (Cox and Singer, 1986; model 21b).
Mineral deposit model number 21b?
Age of mineralization Triassic or younger based on age of host rock (Nokleberg and others, 1991)?
Alteration of deposit Phyllic (Philip. St. George, Chief Exploration Officer, Millrock Resources Inc., oral communication, 2014).

Production and reserves

Workings or exploration From 2011 to 2013, Millrock Resources Inc. conducted soil and rock sampling. In 2013, airborne electromagnetic geophysical survey and spectrometry were flown (Philip. St. George, Chief Exploration Officer, Millrock Resources Inc., oral communication, 2014). Twenty-two soils and five rocks were collected on the occurrence. Soils averaged 47 ppb Au, 175 ppm Cu and 25 ppm Mo with values up to 317 ppb Au, 586 ppm Cu and 275 ppm Mo. Rocks averaged 21 ppb Au, 302 ppm Cu and 15 ppm Mo with values up to 56 ppb Au, 659 ppm Cu and 44 ppm Mo.
Indication of production None

References

References

Cox, D.P., and Singer, D.A., eds., 1986, Mineral deposit models: U.S. Geological Survey Bulletin 1693, 379 p.
Millrock Resources Inc., 2014, Stellar: http://www.millrockresources.com/projects/stellar/ (as of April 29, 2014).
Reporters V.C. Zinno (Alaska Earth Sciences, Inc.)
Last report date 3/15/2016