Unnamed (summit 3162)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Zn
Other commodities Au; Cd; Mo
Ore minerals iron oxide; pyrite

Geographic location

Quadrangle map, 1:250,000-scale SM
Quadrangle map, 1:63,360-scale B-7
Latitude 61.30232
Longitude -158.45779
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is near the top of peak 3162 near the center of the Buckstock Mountains. The occurrence is about 0.2 mile east-southeast of the center of section 17, T. 14 N., R. 51 W., of the Seward Meridian. The location is accurate.

Geologic setting

Geologic description

This occurrence consists of pyrite-rich hornfels derived from the Upper Cretaceous, Kuskokwim Group or Mesozoic Gemuk Group (Cady and others, 1955; M.L. Miller, unpublished field data,1999). The protolith of the fractured hornfels is a medium grained sandstone. The rocks strike N45E and dip 42SE. One grab sample contained up to 21 parts per billion (ppb) gold, 1,750 parts per million (ppm) zinc, 24 ppm molybdenum, and 4.87 ppm cadmium (M.L. Miller, unpublished analytical data, 1999).
Geologic map unit (-158.460135696231, 61.3016067352364)
Mineral deposit model Polymetallic replacement deposit? (Cox and Singer, 1986; model 19a).
Mineral deposit model number 19a?
Age of mineralization Unknown. Miller and others (2002) report a U-Pb age of 59.2 Ma from the nearby Buckstock pluton.
Alteration of deposit Sulfides have altered to iron oxides.

Production and reserves

Workings or exploration The U.S. Geological Survey investigated the site in 1999.
Indication of production None

References

References

Miller, M.L., Bradley, D.C., Bundtzen, T.K., and McClelland, William, 2002, Late Cretaceous through Cenozoic strike-slip tectonics of southwestern Alaska: Journal of Geology, vol.110, p. 247-270.
Reporters T.K. Bundtzen (Pacific Rim Geological Consulting, Inc.) and M.L. Miller (U.S. Geological Survey)
Last report date 5/10/2003