|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||This occurrence is float on a moraine on the mountain northwest of the 1966 terminus of the glacier at the head of the Chistochina River. It is in the southern part of the SE1/4SE1/4 section 4, T. 20 S., R. 15 E., Fairbanks Meridian. The occurrence corresponds to locality 18 on figure 1 of Rose (1967) and locality 9 on figure 6 of Cobb (1979 [OFR 79-238]) and is included with nearby site MH284 in locality 133 on table 2 of Nokleberg and others (1991).|
Geologic descriptionA dunite boulder was collected on glacial moraine near the projected contact of an ultramafic body consisting of dunite, peridotite, and pyroxenite with argillite of the Eagle Creek Formation (Rose, 1967). The ultramafic body is about 1,500 feet across and extends for about one mile, sandwiched between quartz monzonite to the south and argillite of the Eagle Creek Formation to the north. The boulder contained abundant pyrite and probably chalcopyrite and pyrrhotite; it assayed 0.75 percent copper, a trace of gold and platinum, 0.12 ounce of silver per ton, and 0.2 percent nickel (Rose, 1967). The boulder was probably derived locally.
|Geologic map unit||(-144.873029695114, 63.2033045536306)|
|Mineral deposit model||Ni-Cu-PGE in differentiated mafic-ultramafic sill.|
|Age of mineralization||Probably related to ultramafic rocks of Late Triassic age.|
|Workings or exploration||No workings are reported. The sulfide-bearing boulder was found during mapping by Rose (1967).|
|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) and C.C Hawley (Hawley Resource Group)|
|Last report date||7/1/2003|