|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 at an elevation of about 4,300 feet on the south side of an east-flowing tributary to the West Fork Maclaren River, in the SE1/4 NW1/4 section 33, T. 19 S., R. 5 E., Fairbanks Meridian. The occurrence corresponds to locality 11 in figure 4 of Cobb (1979 [OFR 79-238]) and to locality 16 in table 2 of Nokleberg and others (1991).|
Geologic descriptionThe rock at this occurrence is propylitized basalt and andesite of the Nikolai Greenstone of Late Triassic age (Nokleberg and others, 1982, 1991). Mineral deposits at the occurrences are quartz-epidote veins from 2 to 6 inches wide in a minor fault zone. The veins contain local concentrations of primary chalcocite, pyrrhotite, covellite (?), and secondary malachite (Smith and others, 1973, location B). Copper deposits hosted in the Nikolai Greenstone typically contain small amounts of silver.
|Geologic map unit||(-146.80296716612, 63.2249610950952)|
|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||Nikolai Greenstone is propylitized.|
|Workings or exploration||Natural outcrops and float.|
|Indication of production||None|
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.
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.
Smith, T.E., Trible, T.C., and Stein, D.R., 1973, Analyses of rock and stream-sediment samples, Mt. Hayes A-6 quadrangle, south-central Alaska: Alaska Division of Geological and Geophysical Surveys Geochemical Report 26, 1 plate, scale 1:63,360.
|Reporters||W.T. Ellis (Alaska Earth Science), C.C. Hawley (Hawley Resource Group), and W.J. Nokleberg (USGS)|
|Last report date||8/3/2001|