Lagoon Creek

Prospect, Inactive

Commodities and mineralogy

Main commodities Ag; Au
Ore minerals arsenopyrite; chalcopyrite; pyrite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale AN
Quadrangle map, 1:63,360-scale A-4
Latitude 61
Longitude -148.24
Nearby scientific data Find additional scientific data near this location
Location and accuracy Near head of Lagoon Creek on the south flank of Mount Doran, 1 mile south of summit. Lagoon Creek flows southward into the Seward D-4 1:63,360 scale map. Accurate within 2,500 ft. Locality A-34 of Jansons and others (1984).

Geologic setting

Geologic description

According to Jansons and others (1984), quartz veins and stringers up to 1 ft wide are found in a well developed shear zone in hornfelsed Late Cretaceous metasedimentary rocks of the Valdez Group. The zone is about 12 ft wide along the contact of a 50 ft felsic dike with the Valdez Group rocks. Disseminated grains and massive pods of pyrite, with lesser arsenopyrite and chalcopyrite present.
Six samples contained up to 0.005 oz/ton Au and up to 0.05 oz/ton Ag (Jansons and others, 1984).
Geologic map unit (-148.24207813353, 60.9994282728352)
Mineral deposit model Chugach-type low-sulfide Au-quartz veins (Bliss, 1992; model 36a.1?) or Epithermal Au vein?
Mineral deposit model number 36a.1?
Age of mineralization Late Cretaceous or younger; shear zone cuts metasedimentary rocks of the Late Cretaceous Valdez Group.

Production and reserves

Workings or exploration Development limited to a 15 ft long adit. Jansons and others (1984) reported six samples contained up to 0.005 oz/ton Au and up to 0.05 oz/ton Ag, thus site has low potential for mineral development.
Indication of production None

References

MRDS Number A106183
Reporters D.P. Bickerstaff (USGS contractor); S.W. Huss (USGS)
Last report date 7/30/1998