|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 prospect is approximately located on the east side of the West Fork Maclaren River at an elevation of about 3,500 feet, in the NE1/4SW1/4 section 26, T. 19 S., R. 5 E., Fairbanks Meridian. The site corresponds to locality 16 in figure 4 of Cobb (1979 [OFR 79-238]) and to locality 22 in table 2 of Nokleberg and others (1991).|
Geologic descriptionThe rock at the prospect is propylitized metabasalt of the Nikolai Greenstone of Late Triassic age (Nokleberg and others, 1991). The deposit consists of malachite or chalcocite in quartz-epidote veinlets, in vesicles, or on fracture or joint surfaces in the metabasalt (Saunders, 1961 [report for the year]). No assay data are available; small amounts of silver typically occur with the copper deposits of the Nikolai Greenstone.
|Geologic map unit||(-146.73956695998, 63.2366629523443)|
|Mineral deposit model||Basaltic Cu (Cox and Singer, 1986; model 23).|
|Mineral deposit model number||23|
|Age of mineralization||Probably Cretaceous (Nokleberg and others, 1986) or early Tertiary (Stout, 1976); see MH060 and MH100.|
|Alteration of deposit||Propylitic alteration of metabasalt; oxidation of iron- and copper-bearing minerals.|
|Workings or exploration||Copper occurrences were found during geologic investigations in about 1960; there are no known 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., 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.
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||8/4/2001|