Unnamed (near the mouth of Northwestern Lagoon)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Au
Ore minerals pyrite
Gangue minerals feldspar; muscovite; quartz

Geographic location

Quadrangle map, 1:250,000-scale BS
Quadrangle map, 1:63,360-scale C-8
Latitude 59.748
Longitude -149.892
Nearby scientific data Find additional scientific data near this location
Location and accuracy The occurrence is located on the north shore of Harris Bay in the NW1/4 of section 13, T. 5 S., R. 4 W., of the Seward Meridian. This is location 114 of Tysdal (1978); it is accurate to within a quarter of a mile.

Geologic setting

Geologic description

The host rock of the occurrence is a Tertiary iron-stained, muscovite granite dike which cuts hornfelsed slate and graywacke of the Cretaceous Valdez Group. The dike contains disseminated pyrite and (by atomic absorption analysis) 0.15 ppm gold (MacKevett and Holloway, 1977).
Geologic map unit (-149.894132975746, 59.7474355560875)
Mineral deposit model Pyrite and gold; Tertiary granite dike.
Age of mineralization Tertiary?

Production and reserves

Workings or exploration Hand sample assayed 0.15 ppm Au by atomic absorption (MacKevett and Holloway, 1977).
Indication of production None

Additional comments

The occurrence is in Kenai Fjords National Park; the area is now closed to mineral entry.

References

MRDS Number A010598
Reporters Jeff A. Huber (Anchorage)
Last report date 1/27/1999