|Quadrangle map, 1:250,000-scale||MH|
|Quadrangle map, 1:63,360-scale||A-2|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||The occurrence is on a steep ridge west-northwest of peak 5990. It is in the NW1/4NW1/4 of section 4, T. 20 S., R. 15 E., Fairbanks Meridian. The occurrence corresponds to locality 15 on figure 1 of Rose (1967) and locality 6 on figure 6 of Cobb (1979 [OFR 79-238]). The location is probably accurate within 1,000 feet.|
Geologic descriptionThe rocks in the vicinity of this occurrence consist of metabasalts of the Nikolai Greenstone of Late Triassic age (Nokleberg and others, 1991); earlier the rocks were mapped as Mankomen Formation (Rose, 1967). A pyritic unit of the Nikolai Greenstone extends for more than a mile along strike; it is cut by intermediate and mafic dike rocks. The pyritized rock possibly contains a trace of chalcopyrite. Grab sample 6E534 contained 0.02 ounce of gold per ton, 0.18 ounce of silver per ton, and a trace of copper (Rose, 1967, table 5).
|Geologic map unit||(-144.894029861057, 63.2153045198726)|
|Mineral deposit model||Basaltic Cu (Cox and Singer, 1986; model 23).|
|Mineral deposit model number||23|
|Age of mineralization||Post-Late Triassic, on the basis of the age of host rocks.|
|Alteration of deposit||Sulfidization of metabasalt.|
|Workings or exploration||Geologic mapping; limited surface sampling.|
|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.
|Reporters||W.T. Ellis (Alaska Earth Sciences), C.C. Hawley (Hawley Resource Group), and W.J. Nokleberg (USGS)|
|Last report date||7/1/2003|