Lafayette Glacier

Occurrence, Inactive

Commodities and mineralogy

Main commodities Ag; Au
Ore minerals gold; pyrite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale AN
Quadrangle map, 1:63,360-scale A-3
Latitude 61.05
Longitude -147.85
Nearby scientific data Find additional scientific data near this location
Location and accuracy Occurrence in a glacial stream that flows westward from the terminus of Lafeyette Glacier. Accurate within 1 mile. Locality A-17 and P-37 of Jansons and others (1984) and locality P-34 of Hoekzema and Fechner (1986).

Geologic setting

Geologic description

Jansons and others (1984) reported disseminated, very fine-grained gold in poorly washed fluvial glacial gravels. A large volume of gravel occurs in the stream flowing from Lafayette Glacier and large boulders are present. The bedrock in the area is metasedimentary rocks of the Late Cretaceous Valdez Group. Quartz vein material and metasedimentary float rock contain pyrite, a trace of gold, and up to 0.12 oz/ton Ag (Jansons and others, 1984).
Geologic map unit (-147.852045424253, 61.0494486412502)
Mineral deposit model Placer Au (Cox and Singer, 1986; model 39a)
Mineral deposit model number 39a
Age of mineralization Quaternary.

Production and reserves

Workings or exploration There have been no placer workings or production to date and potential for mineral development is low (Jansons and others, 1984). An alluvium sample contained 0.001 oz/cubic yard Au. Two float samples contained a trace of gold and 0.03 and 0.12 oz/ton Ag.
Indication of production None

References

MRDS Number A106190

References

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