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  3. Alaska Resource Data File (ARDF)

Unnamed (east of Lake Elfendahl)

Prospect, Undetermined

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Commodities and mineralogy

Main commodities Cu; Pb; Zn
Other commodities Au
Ore minerals chalcopyrite; galena; pyrite; sphalerite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale SI
Quadrangle map, 1:63,360-scale D-7
Latitude 57.8436
Longitude -136.2592
Nearby scientific data Find additional scientific data near this location
Location and accuracy This prospect is at an elevation of about 1,500 feet, about 1.2 miles east of Lake Elfendahl and 0.6 mile north-northeast of the 2,605-foot peak of Mount Fritz. The prospect is just east of an unnamed lake in the NE1/4 sec. 36, T. 46 S., R. 56 E. It is location P-43 of Bittenbender and others (1999), location 14 of Cobb (1972, 1978), and MAS no. 0021140054 (U.S. Bureau of Land Management, 2002). The location is accurate within about 0.5 mile.

Geologic setting

Geologic description

Johnson and Karl (1985) map the rocks in the area of this prospect as Triassic greenstone intruded by Tertiary(?) granodiorite. The rocks are cut by high-angle faults that mainly strike northwest; the most prominent is the regional-scale Border Ranges Fault whose trace is about a mile southwest of the prospect.
Cobb (1972, 1978), citing Rossman (1959), describes the prospect as a small quartz vein that contains pyrite, chalcopyrite, sphalerite, and galena. The vein is in a fault near the contact between greenstone and diorite. There are no assay data but Rossman speculated that the vein also contains gold.
Geologic map unit (-136.261031792644, 57.843220256451)
Mineral deposit model Polymetallic vein (Cox and Singer, 1986; model 22c).
Mineral deposit model number 22c

Production and reserves

Indication of production Undetermined

Additional comments

The prospect is in West Chichagof-Yakobi Wilderness.

References

MRDS Number A013250

References

Bittenbender, P., Still, J.C., Maas, K., and McDonald, M., Jr., 1999, Mineral resources of the Chichagof and Baranof Islands area, southeast Alaska: Bureau of Land Management, BLM-Alaska Technical Report 19, 222 p.
Cobb, E.H., 1972, Metallic mineral resources map of the Sitka quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-467, scale 1:250,000.
Cobb, E.H., 1978, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Sitka quadrangle: U.S. Geological Survey Open-File Report 78-450, 124 p.
Rossman, Darwin, 1959, Geology and ore deposits of the northwestern part of Chichagof Island, Alaska: U.S. Geological Survey Bulletin 1058-E, p. 139-216.
U.S. Bureau of Land Management, 2002, Alaska mineral locations database report (Sitka quadrangle), July 2, 2002, 205 p. [http://imcg.wr.usgs.gov/dem.html]
Reporters H.C. Berg (U.S. Geological Survey)
Last report date 10/16/2004