|Quadrangle map, 1:250,000-scale||MH|
|Quadrangle map, 1:63,360-scale||A-3|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||This occurrence is at an elevation of about 5,250 feet, about 2 miles east of the terminus of the Gakona Glacier and 1.0 mile north-northeast of VABM 5206 'Ona'. It is about 0.6 mile northeast of the center of section 8, T. 20 S., R. 14 E.|
Geologic descriptionRose (1965) mapped the rocks in the area as argillite intruded by small diorite plutons. Nokleberg and others (1991; 1992 [MF]; 1992 [Open-File] considered that the argillite is part of the Pennsylvanian and Permian, Slana Spur Formation and that the diorite is Triassic. Bittenbender and others (2007) identified isolated outcrops of bleached white marble and mineralized skarn with chalcopyrite and pyrite here; they consider the diorite to be Cretaceous. The marble and skarn is copper stained near the contact with the diorite and their samples contained up to 2,020 parts per million copper and 18 parts per billion gold. They also identified thin veinlets of native copper in diorite rubble. The mineralization is spotty and discontinuous.
|Geologic map unit||(-145.096020258531, 63.2000956422459)|
|Mineral deposit model||Cu skarn deposit (Cox and Singer, 1986; model 18b).|
|Mineral deposit model number||18b|
|Age of mineralization||Unclear whether the diorite that developed the mineralized skarn is Cretaceous or Triassic.|
|Alteration of deposit||Skarn developed at marble-diorite contact.|
|Workings or exploration||Only limited sampling by state and federal agencies.|
|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|