Unnamed (east of head of Granite Creek)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Sn
Other commodities Ag; As; Cd; Zn
Gangue minerals axinite; quartz

Geographic location

Quadrangle map, 1:250,000-scale ID
Quadrangle map, 1:63,360-scale B-2
Latitude 62.38243
Longitude -156.91003
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is on a broad northeast-trending ridge east of the head of Granite Creek on the divide that separates it from the East Fork of the George River. The occurrence is at an elevation of about 1,250 feet, about 0.5 mile northwest of hill 1440, and about 0.5 mile southeast of the center of section 32, T. 27 N., R. 41 W., of the Seward Meridian. The location is accurate.

Geologic setting

Geologic description

This occurrence consists of quartz-axinite veins and veinlets in hornfels derived from the Upper Cretaceous, Kuskokwim Group (Miller and Bundtzen, 1994; Bundtzen and Miller, 1997; Miller, Bundtzen, and Gray, 2005). The size and extent of the occurrence is uncertain. Grab samples of mineralization contain up to 1,000 parts per million (ppm) tin, 5.0 ppm silver, 400 ppm zinc, 2.2 ppm cadmium, and 130 ppm arsenic (McGimsey and others, 1988).
Geologic map unit (-156.912418888697, 62.3817521650867)
Mineral deposit model Sn-polymetallic vein or Polymetallic vein (Cox and Singer, 1986; models 20b and 22c).
Mineral deposit model number 20b or 22c
Alteration of deposit Development of axinite-quartz greisen.

Production and reserves

Workings or exploration Samples were collected by the U.S. Geological Survey and Alaska Division of Geological and Geophysical Surveys in the 1980s (McGimsey and others, 1988).
Indication of production None

Additional comments

The mineralization is similar to that at the Bismarck Creek prospect (ID130).

References

References

Bundtzen, T.K., and Miller, M.L., 1997, Precious metals associated with Late Cretaceous-early Tertiary igneous rocks of southwestern Alaska, in Goldfarb, R.J., and Miller, L.D., eds., Mineral Deposits of Alaska: Economic Geology Monograph 9, p. 242-286.
Szumigala, D.J., 1993, Gold mineralization related to Cretaceous-Tertiary magmatism in the Kuskokwim Mountains of west-central and southwestern Alaska: Los Angeles, University of California Ph.D. dissertation, 300 p.
Reporters T.K. Bundtzen (Pacific Rim Geological Consulting, Inc.), M.L. Miller (U.S. Geological Survey); and C.C. Hawley (Hawley Resource Group)
Last report date 5/23/2003