|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 4,600 feet in the headwaters of a west tributary of the Maclaren River. The occurrence is in the NW1/4NW1/4 section 6, T. 20 S., R. 6 E., Fairbanks Meridian. The occurrence corresponds to locality 19 in figure 4 of Cobb (1979 [OFR 79-238]) and to locality 27 in table 2 of Nokleberg and others (1991).|
Geologic descriptionThe rock at this occurrence is propylitized metabasalt of the Nikolai Greenstone of Late Triassic age (Nokleberg and others, 1991). The deposit consists of bornite, chalcocite, and malachite in quartz-epidote veinlets, in vesicles, and on fracture or joint surfaces in metabasalt (Saunders, 1961 [report for the year]; Smith and others, 1973). No assays are available, but small quantities of silver commonly occur in copper deposits in the Nikolai Greenstone.
|Geologic map unit||(-146.685164294023, 63.2165639587603)|
|Mineral deposit model||Basaltic Cu (Cox and Singer, 1986; model 23).|
|Mineral deposit model number||23|
|Age of mineralization||The deposit is probably Cretaceous or early Tertiary in age (see MH060 and MH100).|
|Alteration of deposit||Propylitic alteration of basalt.|
|Workings or exploration||The deposit was found during regional mapping and sampling; there are no workings.|
|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.
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.
Saunders, R.H., 1961, Susitna-MacClaren area in Williams, J.A., 1961, Report of the Division of Mines and Minerals for the year 1961: Alaska Division of Mines and Minerals Annual Report 1961, pp. 37-40.
|Reporters||W.T. Ellis (Alaska Earth Science), C.C. Hawley (Hawley Resource Group), and W.J. Nokleberg (USGS)|
|Last report date||8/5/2001|