Unnamed (upper south fork of Stampede Creek) (ARDF #DN145) Cu

Unnamed (upper south fork of Stampede Creek)

Occurrence, Inactive

Commodities and mineralogy

Main commodities	Cu
Other commodities	Ag; Mo; Sb; Zn
Ore minerals	chalcopyrite; malachite; pyrite
Gangue minerals	quartz

Geographic location

Quadrangle map, 1:250,000-scale	DN
Quadrangle map, 1:63,360-scale	C-1
Latitude	63.7306
Longitude	-150.3871
Nearby scientific data	Find additional scientific data near this location
Location and accuracy	This occurrence is at an elevation of about 2750 feet at the head of an unnamed south fork of Stampede Creek. It is approximately at the midpoint of the boundary between sections 1 and 2, T. 14 S., R. 15 W., Fairbanks Meridian. The occurrence corresponds to number 65a of Bundtzen, Smith, and Tosdal (1976), and 108 of Thornsberry, McKee, and Salisbury (1984).

Geologic setting

Geologic description The country rocks in the area of this occurrence are quartz-feldspar schist and gneiss of the upper Precambrian Birch Creek Schist, and graphitic quartzite either of the Birch Creek Schist or of the lower Paleozoic Keevy Peak Formation. The rocks appear to be cut by NE-striking faults subsidiary to the Stampede fault (Thornsberry, McKee, and Salisbury, 1984, pl. K-4; Hawley and Associates, 1978, fig. 4-1-A(2)). The occurrence consists of a foot-thick quartz vein that contains disseminated chalcopyrite and pyrite, and is stained by malachite (Bundtzen, Smith, and Tosdal (1976, occurrence 65a). Hawley and Associates (1978; fig. 4.1-A(2), samples 128-131) collected soil samples on the ridge above the occurrence that contained up to 3.8 ppm silver, 10 ppm molybdenum, 46 ppm antimony, and 255 ppm zinc.
Geologic map unit	(, )
Mineral deposit model	Polymetallic vein (Cox and Singer, 1986; model 22c).
Mineral deposit model number	22c
Age of mineralization	The deposit is assumed to be Eocene (see record DN091).
Alteration of deposit	Oxidation of copper mineral.

Production and reserves

Workings or exploration	The vein was discovered and described by Bundtzen, Smith, and Tosdal (1976). Later investigators mapped and collected soil samples in the area (Hawley and Associates, 1978).
Indication of production	None
Additional comments The occurrence is in Denali National Park and Preserve.

References

MRDS Number	A011293
References Bundtzen, T.K., Smith, T.E., and Tosdal, R.M., 1976, Progress report--Geology and mineral deposits of the Kantishna Hills: Alaska Division of Geological and Geophysical Surveys Open-File Report AOF-98, 80 p., 2 sheets, scale 1:63,360. Cox, D.P., and Singer, D.A., eds., 1986, Mineral deposit models: U.S. Geological Survey Bulletin 1693, 379 p. Hawley, C. C. and Associates, Inc, 1978, Mineral appraisal of lands adjacent to Mt. McKinley National Park, Alaska: U. S. Bureau of Mines Open-File Report 24-78, 275 p. (paged by sections). Thornsberry, V. V., McKee, C. J., and Salisbury, W. G., eds, 1984, 1983 Mineral Resource Studies: Kantishna Hills and Dunkle Mine Areas, Denali National Park and Preserve, Alaska: U. S. Bureau of Mines Open-File Report 129-84. 3 Volumes: v. 1, Text; v. 2, Appendices; v. 3, Maps. Prepared by Salisbury & Dietz, Inc., Spokane, WA.
Reporters	C.C. Hawley
Last report date	5/6/2001