Unnamed (tributary of the east fork in Broxson Gulch) (ARDF #MH136) Ag, Au

Unnamed (tributary of the east fork in Broxson Gulch)

Occurrence, Inactive

Commodities and mineralogy

Main commodities	Ag; Au
Other commodities	Mo
Ore minerals	pyrite
Gangue minerals	quartz

Geographic location

Quadrangle map, 1:250,000-scale	MH
Quadrangle map, 1:63,360-scale	B-5
Latitude	63.3223
Longitude	-146.0569
Nearby scientific data	Find additional scientific data near this location
Location and accuracy	This occurrence is at an elevation of about 4,700 feet in the headwaters of an unnamed east tributary to the east fork the stream(s) in Broxson Gulch. The occurrence is about a quarter-mile northeast of peak 4825 in section 29, T. 18 S., R. 9 E., Fairbanks Meridian. This occurrence corresponds to locality 54 in table 2 of Nokleberg and others (1991).

Geologic setting

Geologic description The rocks in the area of this occurrence are andesitic tuffs and breccias of the Slana Spur Formation of Late Paleozoic age (Nokleberg and others, 1991). The occurrence is about one-quarter mile north of the Airstrip Fault that bounds the Slana Spur unit on the south (Rose, 1965, figure 2). The mineral deposit consists of sheared and silicified metavolcanic graywacke; grab sample 79IL027E assayed 2.3 parts per million (ppm) gold, 150 ppm silver, and 30 ppm molybdenum (Nokleberg and others, 1991, locality 54, table 2).
Geologic map unit	(-146.059163282221, 63.3218805644805)
Mineral deposit model	Low sulfide Au-quartz vein? (Cox and Singer, 1986; model 36a?).
Mineral deposit model number	36a?
Age of mineralization	Possibly mid-Cretaceous, related to faulting and regional metamorphism (Nokleberg and others, 1982).
Alteration of deposit	Silicification of the host rock.

Production and reserves

Workings or exploration	The occurrence is on active MAN Resources claims.
Indication of production	None

References

References Nokleberg, W.J., Albert, N.R.D., Bond, G.C., Herzon, P.L., Miyaoka, R.T., Nelson, W.H., Richter, D.H., Smith T.E., Stout, J.H., Yeend, Warren, and Zehner, R.E., 1982, Geologic map of the southern Mount Hayes quadrangle, Alaska: U.S. Geological Survey Open-File Report 82-52, 27 p., 1 sheet,scale 1:250,000. 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., 1965, Geology and mineral deposits of the Rainy Creek area, Mt. Hayes quadrangle, Alaska: Alaska Division of Mines and Minerals Geologic Report 14, 57 p., 1 sheet, scale 1:36,000.
Reporters	W.T. Ellis (Alaska Earth Science), C.C. Hawley (Hawley Resource Group), and W.J. Nokleberg (USGS)
Last report date	6/19/2001