Unnamed (near the mouth of Slate Creek) (ARDF #MH289) Cu

Unnamed (near the mouth of Slate Creek)

Occurrence, Inactive

Commodities and mineralogy

Main commodities	Cu
Other commodities	Ag; Au
Ore minerals	chalcopyrite; pyrite

Geographic location

Quadrangle map, 1:250,000-scale	MH
Quadrangle map, 1:63,360-scale	A-2
Latitude	63.1704
Longitude	-144.8632
Nearby scientific data	Find additional scientific data near this location
Location and accuracy	This occurrence is near the mouth of Slate Creek, near the center of the W1/2NW1/4 section 22, T. 20 S., R. 15 E., Fairbanks Meridian. The occurrence corresponds to locality 24 of Rose (1967), locality 17 on figure 6 of Cobb (1979 [OFR 79-238]), locality 48 of MacKevett and Holloway (1977), and locality 136 in table 2 of Nokleberg and others (1991). The location is accurate within 0.1 mile.

Geologic setting

Geologic description Rocks in the vicinity of the occurrence consist mainly of andesite and dacite of Pennsylvanian age northwest of a dike-like body of quartz monzonite of Mesozoic age (Rose, 1967). The volcanic rocks are highly pyritized and contain weakly disseminated chalcopyrite (MacKevett and Holloway, 1977). A sample of pyritized volcanic rocks contained a trace of gold, 0.12 ounce of silver per ton, and 0.15 percent copper (Rose, 1967).
Geologic map unit	(-144.865427040287, 63.1700026623526)
Mineral deposit model	Porphyry Cu (Cox and Singer, 1986; model 20c).
Mineral deposit model number	20c
Age of mineralization	The mineralization is either syngenetic and related to the Pennsylvanian volcanic rocks or epigenetic, related to the Mesozoic quartz monzonite body.
Alteration of deposit	Pyritization of volcanic rocks.

Production and reserves

Indication of production	None

References

References 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. MacKevett, E.M., Jr., and Holloway, C.D., 1977, Map showing metalliferous and selected non-metalliferous mineral deposits in the eastern part of southern Alaska: U.S. Geological Survey Open-File Report 77-169-A, 99 p., 1 sheet, scale 1:1,000,000. 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. Rose, A.W., 1967, Geology of the upper Chistochina River area, Mount Hayes quadrangle, Alaska: Alaska Division of Mines and Minerals Geologic Report 28, 41 p., 2 maps, scale 1:40,000.
Reporters	W.T. Ellis (Alaska Earth Sciences), C.C. Hawley (Hawley Resource Group), and W.J. Nokleberg (USGS)
Last report date	7/9/2003