|Quadrangle map, 1:250,000-scale||MH|
|Quadrangle map, 1:63,360-scale||A-5|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||This prospect is on the ridge between Boulder Creek and the Maclaren River at an elevation of approximately 4,400 feet and about 1,000 feet east of the center of section 29, T. 19 S., R. 7 E., Fairbanks Meridian. The location is probably accurate within 1,000 feet. This occurrence corresponds to locality A21 of Kurtak and others (1992).|
Geologic descriptionBedrock in the area consists of northwest-striking metabasalt of the Nikolai Greenstone of Late Triassic age (Kurtak and others, 1992; Nokleberg and others, 1991). U.S. Bureau of Mines investigators found several small areas that contained copper-bearing blebs and veins mainly consisting of quartz-carbonate-epidote. Copper minerals include malachite, probably chalcocite, and unspecified 'copper oxide' minerals (Kurtak and others, 1992, table A21). Four of six grab samples collected by the Bureau contained more than 0.1 percent copper. One sample of an epidote-carbonate vein contained 0.71 percent copper. Samples contained only near background concentrations of gold and silver.
|Geologic map unit||(-146.444461351083, 63.2388706335345)|
|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||Propylitic alteration of metabasalt; formation of copper-bearing quartz-epidote-carbonate segregations in veins and as blebs.|
|Workings or exploration||The Sunshine claims were staked by Northland Mines in 1974 and 1975.|
|Indication of production||None|
Additional commentsThe copper occurrences are very small, extending only a few feet along strike (Kurtak and others, 1992).
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., Aleinikoff, J.N., and Lange, I.M., 1986, Cretaceous deformation and metamorphism in the northeastern Mount Hayes quadrangle, eastern Alaska Range, in Bartsch-Winkler, Susan, and Reed, K. M., eds., Geologic studies in Alaska by the U.S. Geological Survey during 1985: U.S. Geological Survey Circular 978, p. 64-69
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|