|Quadrangle map, 1:250,000-scale||MH|
|Quadrangle map, 1:63,360-scale||A-6|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||This occurrence is on the west side of the West Fork Maclaren River valley at an elevation of approximately 3,600 feet, in the SE1/4SE1/4 section 33, T. 19 S., R. 5 E., Fairbanks Meridian. The occurrence corresponds to locality 10 of Kaufman (1964) and locality 10 in figure 4 of Cobb (1979 [OFR 79-238]). The location is probably accurate within one-third mile.|
Geologic descriptionThe rock at this occurrence is Nikolai Greenstone of Late Triassic age (Nokleberg and others, 1982, 1991). Copper-bearing float occurs throughout a rock slide at the locality (Kaufman, 1964). The float consists of propylitized greenstone containing copper-rich pods and copper-bearing quartz-epidote-calcite veins that cut the greenstone. The copper minerals bornite and chalcocite and their oxidation products (azurite, chrysocolla, and malachite) were observed at the site. The rocks were not sampled; small amounts of silver typically occur with copper in the Basaltic Cu-type deposits of the area.
|Geologic map unit||(-146.785066607238, 63.2205614643664)|
|Mineral deposit model||Basaltic Cu (Cox and Singer, 1986; model 23).|
|Mineral deposit model number||23|
|Age of mineralization||Probably Cretaceous or early Tertiary (see MH060).|
|Alteration of deposit||The mineralization is associated with quartz-epidote-calcite veins in propylitized basalt and andesite of the Nikolai Greenstone.|
|Indication of production||None|
Additional commentsA traverse above the copper-bearing rock slide failed to reveal a source (Kaufman, 1964).
Cobb, E.H., 1979, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Mount Hayes quadrangle, Alaska: U.S. Geological Survey Open-File Report 79-238, 140 p.
Kaufman, M.A., 1964, Geology and mineral deposits of the Denali-Maclaren River area, Alaska: Alaska Division of Mines and Minerals Geologic Report 4, 15 p., 1 sheet, scale 1:125,000.
Kurtak, J.M., Southworth, D.D., Balen, M.D., and Clautice, K.H., 1991, Mineral investigations in the Valdez Creek Mining District, south-central Alaska: U.S. Bureau of Mines Open-File Report 1-92, 658 p., 2 sheets, scale 1:250,000.
Nokleberg, W.J., Albert, N.R.D., Bond, G.C., Herzon, P.L., Miyaoka, R.T., Nelson, W.H., Richter, D.H., Smith T.E., Stout, J.H., Yeend, Warren, and Zehner, R.E., 1982, Geologic map of the southern Mount Hayes quadrangle, Alaska: U.S. Geological Survey Open-File Report 82-52, 27 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 Science), C.C. Hawley (Hawley Resource Group), and W.J. Nokleberg (USGS)|
|Last report date||8/3/2001|