|Quadrangle map, 1:250,000-scale||MH|
|Quadrangle map, 1:63,360-scale||B-4|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||The prospect is at an elevation of about 4,800 feet, about 3.3 miles northeast of the mouth of Specimen Creek on Eureka Creek. It is about 0.3 mile north-northeast of the center of section 3, T. 19 S., R. 9 E.|
Geologic descriptionAs described by Nokleberg and others (1992 [OF]; 1992 [MF]), the rocks in the area are Triassic gabbro to the south and Triassic greenstone to the north. Rose (1965) described the mineralization as a flat-lying lens about 3 feet thick and 10 feet long that consists of massive pyrrhotite, pyrite, and minor pyrite. The pyrrhotite is partly altered to marcasite. The lens is overlain by white, bleached marble with diopside and brown garnet; gabbro is beneath it (Bittenbender and others, 2007). A sample collected by Rose (1965) contained 0.37 percent copper, 0.5 percent nickel, 0.03 ounce of gold per ton, and 0.33 ounce of silver per ton. A sample collected by Nokleberg and others (1991) contained 0.43 percent copper and 12.5 parts per million silver. Bittenbender and others (2007) collected a sample across 2.5 feet of the lens of mineralization; it contained more than 15 percent iron, 659 ppm copper, 982 ppm nickel, 0.0003 ounce of gold per ton, and 0.009 ounce of silver per ton. As of 2007, the prospect was covered by a large block of claims held by Nevada Star Resource Corp. but there was no indication of any workings on it.
|Geologic map unit||(-146.003260637563, 63.3003807966639)|
|Mineral deposit model||Copper-nickel skarn deposit?|
|Age of mineralization||Possible Triassic or younger based on the age of some of the host rocks in the area but may be related to nearby Permian intrusive rocks.|
|Alteration of deposit||Pyrrhotite oxidized to marcasite. Lens of mineralization associated with a diopside-garnet marble.|
|Workings or exploration||As of 2007, the prospect was on claims held by Nevada Star Resource Corp. but there was no indication of any substantial workings on it.|
|Indication of production||None|
Bittenbender, P.E., Bean, K.W., Kurtak, J.M., and Deininger, James Jr., 2007, Mineral assessment of the Delta River Mining District area, east-central, Alaska: U.S. Bureau of Land Management, Alaska Technical Report 57, 675 p.
Nokleberg, W. J., Aleinikoff, J. N., Dutro, J. T., Lanphere, M. A., Silberling, N. J., Silva, S. R., Smith, T. E., and Turner, D. L., 1992, Map, tables, and summary of fossil and isotopic age data, Mount Hayes Quadrangle, eastern Alaska range, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-1996-D, 43 p., 1 sheet, scale 1:250,000.
Nokleberg, W.J., Aleinikoff, J. N., Lange, I. M.; Silva, S. R., Miyaoka, R. T., Schwab, C. E., Zehner, R. E., Bond, G. C., Richter, D. H., Smith, T. E., and Stout, J. H., 1992, Preliminary geologic map of the Mount Hayes quadrangle, eastern Alaska Range, Alaska: U.S. Geological Survey Open-File Report 92-594, 39 p. 1 sheet, scale 1:250,000.
Nokleberg, W.J., Lange, I.M., Roback, R.C., Yeend, Warren, and Silva, S.R., 1991, Map showing locations of metalliferous lode and placer mineral occurrences, mineral deposits, prospects, and mines, Mount Hayes quadrangle, eastern Alaska Range, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-1996-C, 42 p., 1 sheet, scale 1:250,000.
|Reporters||W.T. Ellis (Alaska Earth Sciences), C.C. Hawley (Hawley Resource Group), and W.J. Nokleberg (USGS); D.J. Grybeck (Contractor, USGS)|
|Last report date||5/13/2012|