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Unnamed (north of Slope Creek)

Occurrence, Inactive

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Commodities and mineralogy

Main commodities Au
Ore minerals gold

Geographic location

Quadrangle map, 1:250,000-scale GU
Quadrangle map, 1:63,360-scale D-1
Latitude 62.79
Longitude -144
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is on the ridge about 1/4 mile north of Slope Creek on the boundary between the Gulkana D-1 quadrangle and the Nabesna D-6 quadrangle. It is an approximate location at the south end of an auriferous intrusion mostly exposed on the Nabesna D-6 quadrangle. It is in the SE1/4NE1/4, section 25, T. 12 N., R. 7 E., Copper River Meridian. The occurrence is within the 'area 2' anomalous zone of WGM Inc. (1980) and is within the Porcupine prospect area of Homestake Mining Company (Bull, Schneider and Freeman, 1997; Bull, Freeman, and Schneider, 1999).

Geologic setting

Geologic description

The occurrence is at the south end of a linear, Jurassic diorite intrusive complex that continues north to north-northwest for about 2 miles (Richter, 1966; Richter and Matson, 1968).
A soil sample contains more than 100 ppb gold, and the north-flowing stream draining the area of the occurrence contains 2,700 ppb gold in stream sediments. Stream sediment samples draining the entire 2-mile long intrusion are extremely anomalous in gold i.e., from 1,000 to greater than 2,000 ppb. The streams drain the intrusion and its contact region and the gold is almost certainly derived from mineral deposits in the intrusion or in its contact rocks.
Geologic map unit (-144.002191354521, 62.7896112956654)
Age of mineralization Probably related to the intrusion of a Jurassic diorite.

Production and reserves

Workings or exploration The area has only been explored by reconnaissance methods.
Indication of production None

Additional comments

Additional information can be obtained from Ahtna Minerals in Anchorage, Alaska.

References

MRDS Number 10307484

References

Bull, Katharine, Freeman, Larry, and Schneider, Craig, 1999, Slana property summary report for Homestake Mining Company: 11 p., analytical appendices. (Report held by Ahtna Minerals Co., Anchorage, Alaska).
Bull, Katharine, Schneider, Craig, and Freeman, Larry, 1997, Summary report for Ahtna Corporation: 12 p., appendices, maps. (Report held by Ahtna Minerals Co., Anchorage, Alaska).
Richter, D.H., 1966, Geology of the Slana district, southcentral Alaska: Alaska Division of Geological and Geophysical Surveys Geological Report 2l, 54 p., 3 sheets, scale 1:63,360.
Richter, D.H., and Matson, N.A., Jr., 1968, Distribution of gold and some base metals in the Slana area, eastern Alaska Range, Alaska: U.S. Geological Survey Circular 593, 20 p.
WGM Inc., 1980, 1979 Summary report of gold potential, Slana District, Ahtna project: WGM Inc., 10 p., map, scale 1:63,360. (Report held by Ahtna Mineral Co., Anchorage, Alaska).
Reporters W.T. Ellis (Alaska Earth Sciences), C.C. Hawley (Hawley Resource Group), and W.J. Nokleberg (U.S. Geological Survey)
Last report date 12/6/2000