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Unnamed (ridge at head of Spruce Creek)

Occurrence, Inactive

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Commodities and mineralogy

Main commodities Ag
Other commodities Au; Pb; Zn
Ore minerals galena; pyrite; sphalerite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale DN
Quadrangle map, 1:63,360-scale C-2
Latitude 63.5792
Longitude -150.7248
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is at an elevation of about 4200 feet at the head of Spruce Creek. It is about 0.7 mile southwest of Spruce Peak. The location is accurate within 250 feet. The occurrence is approximately the same as that of sample locality 244 of Hawley and Associates (1978).

Geologic setting

Geologic description

The country rocks near this occurrence are metafelsite and chloritic phyllite of the lower Paleozoic Spruce Creek sequence (Bundtzen, 1981; Thornsberry, McKee, and Salisbury, 1984, fig. K-2). The deposit is a steeply-dipping quartz-sulfide vein that strikes about N50E and is 2 to 3 feet thick. The vein is largely oxidized, but contains pyrite. A sample of residual soil along the strike of the vein contained 0.47 ppm gold, 120 ppm silver, 675 ppm copper, 14500 ppm lead, and 21000 ppm zinc (Hawley and Associates, 1978, no. 244). The lead and zinc values indicate that the vein contains galena and sphalerite.
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 sulfide minerals.

Production and reserves

Workings or exploration The vein may have been explored by small pits, since sloughed.
Indication of production None

Additional comments

The occurrence is in Denali National Park and Preserve.

References

References

Bundtzen, T.K., 1981, Geology and mineral deposits of the Kantishna Hills, Mt. McKinley quadrangle, Alaska: M. S. Thesis, University of Alaska, College, Alaska, 238 p.
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 5/2/2001