Unnamed (near Dartmouth Glacier)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Ag; As; Au
Ore minerals arsenopyrite; galena; pyrite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale AN
Quadrangle map, 1:63,360-scale A-2
Latitude 61.17
Longitude -147.66
Nearby scientific data Find additional scientific data near this location
Location and accuracy On slope 1 mile north-northeast from terminus of Dartmouth Glacier. Accurate within 3,000 ft. Locality A-16 of Jansons and others (1984).

Geologic setting

Geologic description

Jansons and others (1984) reported several sub-parallel quartz veins in shear zones in and along margin of a small granitic stock. The veins are 2 to 12 inches wide and contain disseminated grains and massive pods of arsenopyrite and lesser disseminated galena and pyrite. The granitic stock intrudes metasedimentary rocks of the Late Cretaceous Valdez Group.
Three chip samples averaged 0.15 oz/ton Au and 0.37 oz/ton Ag. Three grab samples contained traces of gold and up to 0.03 oz/ton Ag (Jansons and others, 1984).
Geologic map unit (-147.662041108607, 61.1694642812968)
Mineral deposit model Chugach-type low-sulfide Au-quartz veins? (Bliss, 1992; model 36a.1?) or Epithermal Au vein?
Mineral deposit model number 26a.1?
Age of mineralization Late Cretaceous or younger; shear zones and veins cut a small granitic stock which intrudes metasedimentary rocks of the Late Cretaceous Valdez Group.

Production and reserves

Workings or exploration Three chip samples averaged 0.15 oz/ton Au and 0.37 oz/ton Ag. Three grab samples contained traces of gold and up to 0.03 oz/ton Ag. This location has moderate mineral development potential (Jansons and others, 1984).
Indication of production None

References

MRDS Number A106195
Reporters D.P. Bickerstaff (USGS contractor); S.W. Huss (USGS)
Last report date 7/30/1998