Unnamed (near Gilbert Bay) (ARDF #SD006) Ag, Au, Cu

Unnamed (near Gilbert Bay)

Prospect, Inactive

Commodities and mineralogy

Main commodities	Ag; Au; Cu
Gangue minerals	quartz

Geographic location

Quadrangle map, 1:250,000-scale	SD
Quadrangle map, 1:63,360-scale	D-6
Latitude	57.95658
Longitude	-133.74154
Nearby scientific data	Find additional scientific data near this location
Location and accuracy	This old prospect is at an elevation of about 200 feet near an unnamed creek. It is about 2.6 miles south-southeast of the the abandoned town of Snettisham on the northern Snettisham Peninsula. The prospect is about 0.4 mile north-northwest of the center of section 22, T. 45 S., R. 72 E.

Geologic setting

Geologic description Little detail is available on the deposits on the west side of Gilbert Bay and in the basin of what is informally called Argenta Creek which heads near peak 1651. However, Redman and others (1989) found an open cut near the shore of Gilbert Bay and a sample that they collected of chlorite phyllite contained 400 ppm copper. Black phyllite about 1.5 miles upstream contained 0.6 ppm gold; a black phyllite in lower Argenta Basin contained 1.4 ppm Ag. (Also see SD007 for prospects at the head of Argenta Basin.) The rocks in this area on the Snettisham Peninsula are part of the Permian to Cretaceous metavolcanic unit of Gehrels and Berg (1992).
Geologic map unit	(-133.743275096495, 57.9562458094051)

Geologic description

Little detail is available on the deposits on the west side of Gilbert Bay and in the basin of what is informally called Argenta Creek which heads near peak 1651. However, Redman and others (1989) found an open cut near the shore of Gilbert Bay and a sample that they collected of chlorite phyllite contained 400 ppm copper. Black phyllite about 1.5 miles upstream contained 0.6 ppm gold; a black phyllite in lower Argenta Basin contained 1.4 ppm Ag. (Also see SD007 for prospects at the head of Argenta Basin.) The rocks in this area on the Snettisham Peninsula are part of the Permian to Cretaceous metavolcanic unit of Gehrels and Berg (1992).

Geologic map unit

(-133.743275096495, 57.9562458094051)

Production and reserves

Workings or exploration	At least one open cut.
Indication of production	None

References

References Gehrels, G.E., and Berg, H.C., 1992, Geologic map of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigations Map I-1867, 24 p., 1 sheet, scale 1:600,000. Redman, E.C., Maas, K.M., Kurtak, J.M., and Miller, L.D., 1991, Section D: Juneau Gold Belt subarea, in U.S. Bureau of Mines, Mineral investigations in the Juneau Mining District, Alaska, 1984-1988: Volume 2 - Detailed mine, prospect, and mineral occurrence descriptions: U.S. Bureau of Mines Special Publication VOL. 2D, 424 p., 19 sheets.
Reporters	Donald Grybeck (U.S. Geological Survey)
Last report date	10/8/2004