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Rainy Creek Ridge No. 2

Occurrence, Inactive

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Commodities and mineralogy

Main commodities Ag; Au
Other commodities As
Ore minerals arsenopyrite; pyrite; scorodite
Gangue minerals kaolinite; quartz

Geographic location

Quadrangle map, 1:250,000-scale MM
Quadrangle map, 1:63,360-scale C-2
Latitude 63.5688
Longitude -150.7139
Nearby scientific data Find additional scientific data near this location
Location and accuracy The Rainy Creek Ridge No. 2 prospect is at an elevation of about 3750 feet on the ridge between the East Fork of Glen Creek and Spruce Creek It is in the NE1/4 SE1/4 of section 31, T. !5 S., R. 16 W., Fairbanks Meridian. The location corresponds to number 83 of Thornsberry, McKee, and Salisbury (1984), which includes the Rainy Creek Ridge Nos. 1 and 2 claims, to number 55 of Bundtzen, Smith, and Tosdal (1976), and to number 250 of Hawley and Associates (1978). The location is accurate within 500 feet. It is not certain whether it actually marks the Rainy Ridge Creek No. 2 claim, but it appears likely to.

Geologic setting

Geologic description

The country rocks at this occurrence are steeply-dipping metafelsite and chloritic phyllite of the Spruce Creek sequence; the rocks strike ENE (Bundtzen, 1981; Thornsberry, McKee, and Salisbury, 1984, fig. K-2).
The occurrence is a 15-foot-wide, nearly vertical, silicified shear zone that strikes N60-75E; it contains massive arsenopyrite along with less-abundant pyrite. Quartz is the main gangue mineral, accompanied by some kaolinite.
Samples of the mineralized shear zone assayed as much as 0.01 ounce of gold per ton, 0.23 ounce of silver per ton, 11.0 percent arsenic, 0.31 percent lead, 0.25 percent antimony, 0.011 percent copper, and 0.04 percent zinc (Bundtzen, 1981, location 59b) . Some of the arsenopyrite is oxidized to scorodite.
Geologic map unit (-150.716182741783, 63.568299134995)
Mineral deposit model Arsenopyrite-quartz lode containing minor gold, silver, and base metals.
Age of mineralization The deposit is assumed to be Eocene (see record MM091).
Alteration of deposit Silicification, argillization. Oxidation of arsenic mineral.

Production and reserves

Workings or exploration The claim is unpatented and there are no workings.
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.
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.
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 5/3/2001