Unnamed (south of mouth of Fishhook Bay)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Ag; Cu; Pb; Zn
Other commodities As; Sb
Ore minerals arsenopyrite; chalcopyrite; galena; pyrite; sphalerite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale CG
Quadrangle map, 1:63,360-scale A-2
Latitude 56.004
Longitude -158.644
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is located in T. 48 S., R. 60 W., of the Seward Meridian, approximately 1.3 miles south of the mouth of Fishook Bay. The location is accurate to within 1/2 mile.

Geologic setting

Geologic description

The rocks at this site consist of Cretaceous Hoodoo Formation cut by andesite dikes. The U.S. Geological Survey sampled a pyritic quartz vein which cuts hornfelsed siltstone of the Hoodoo Formation at this site (Angeloni and others, 1985). The width of the vein is unknown. The sample of vein material ran 200 ppm antimony, greater than 10,000 ppm arsenic, 1,500 ppm copper, 1,500 ppm lead, 150 ppm silver; and greater than 10,000 ppm zinc.
Geologic map unit (-158.646015392254, 56.003215872544)
Mineral deposit model Polymetallic vein (Cox and Singer, 1986; model 22c).
Mineral deposit model number 22c
Age of mineralization Tertiary?

Production and reserves

Workings or exploration Rock sample (83AWs 57) of vein material collected by the U.S. Geological Survey contained 200 ppm antimony, greater than 10,000 ppm arsenic, 1,500 ppm copper, 1,500 ppm lead, 150 ppm silver, and greater than 10,000 ppm zinc.
Indication of production None

Additional comments

This site is located within the Alaska Peninsula National Wildlife Refuge.

References

MRDS Number 10307311
Reporters S.H. Pilcher (Anchorage)
Last report date 2/8/2000