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  3. Alaska Resource Data File (ARDF)

Unnamed (near Blind Slough)

Occurrence, Undetermined

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Commodities and mineralogy

Main commodities Cu
Other commodities Pb; Zn
Ore minerals pyrrhotite

Geographic location

Quadrangle map, 1:250,000-scale PE
Quadrangle map, 1:63,360-scale C-3
Latitude 56.5525
Longitude -132.7542
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is in a borrow pit just north of the center of the head of Blind Slough at an elevation of about 120 feet. It is about 0.2 mile south of the center of section 27, T. 61 S., R. 81 E.

Geologic setting

Geologic description

This occurrence was found by Still and others (2002) in a borrow pit beside a logging road. The occurrence consists of rubble of iron- and copper-stained hornblendite with massive pyrrhotite. A sample contained 1,007 parts per million (ppm) copper, 303 ppm lead, and 395 ppm zinc. Karl and others (1999) map the rocks around the pit as Cretaceous tonalite, granodiorite, and quartz diorite.
Geologic map unit (-132.755912061158, 56.5521565253626)
Mineral deposit model Pyrrhotite in hornblendite with copper.
Age of mineralization Cretaceous or younger based on the age of the host rocks.

Production and reserves

Workings or exploration Sampling in a borrow pit by government geologists.
Indication of production None

References

References

Karl, S.W., Haeussler, P.J., and McCafferty, A.E., 1999, Reconnaissance geologic map of the Duncan Canal-Zarembo Island area, southeastern Alaska: U.S. Geological Survey Open-File Report 99-0168, 30 p., 1 sheet, scale 1:150,000.
Still, J.C., Bittenbender, P.E., Bean, K.W., and Gensler, E.G., 2002, Mineral assessment of the Stikine area, central Southeast Alaska: U.S. Bureau of Land Management Technical Report 51, 560 p.
Reporters D.J. Grybeck (Port Ludlow, WA)
Last report date 4/8/2007