|Ore minerals||chalcopyrite; malachite; secondary copper minerals|
|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 south of the terminus of the Chistochina Glacier at an elevation of about 4,600 feet. It is about 1.1 miles northeast of the mouth of Slate Creek and about one-half mile southwest of informally named Big Four Creek, in the NW1/4SW1/4 of sec. 14, T. 20 S., R. 15 E., Fairbanks Meridian. It corresponds to locality 23 of Rose (1967), locality 13 on figure 6 of Cobb (1979 [OFR 79-238]), and locality 135 of Nokleberg and others (1991). The location is probably accurate within 0.2 mile.|
Geologic descriptionThis occurrence is in a body of gabbro and mafic gabbro that is about a mile wide and possibly elongated to the northeast (Rose, 1967). The gabbro is probably Late Triassic in age. The mafic intrusive is overlain unconformably by the 'round wash' conglomerate of Tertiary age. The same gabbro body forms the bedrock in the Big Four Creek placer deposit (MH293). Chalcopyrite and secondary copper minerals, probably including malachite, occur in a vein or in a vuggy epidote-filled segregation in gabbro.
|Geologic map unit||(-144.834129069564, 63.1800043588989)|
|Age of mineralization||Late Triassic or younger, on the basis of the age of the host rock.|
|Alteration of deposit||Alteration consists of epidote-filled veining or segregations in gabbro.|
|Workings or exploration||No workings are reported.|
|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||7/2/2003|