Unnamed (southwest of lower Scott Glacier) (ARDF #CV055) Cu, Zn

Unnamed (southwest of lower Scott Glacier)

Occurrence, Inactive

Commodities and mineralogy

Main commodities	Cu; Zn
Other commodities	Ag
Ore minerals	bornite; chalcopyrite; pyrrhotite; sphalerite

Geographic location

Quadrangle map, 1:250,000-scale	CV
Quadrangle map, 1:63,360-scale	C-4
Latitude	60.62
Longitude	-145.319
Nearby scientific data	Find additional scientific data near this location
Location and accuracy	This occurrence is at an elevation of about 1000 feet approximately 0.5 mile southeast of lower Scott Glacier. It is in the SE1/4 sec. 25, T. 14 S., R. 1 W., of the Copper River Meridian. Site accurate to within 1000 ft. Site is location C-16 of Jansons and others (1984).

Geologic setting

Geologic description This occurrence consists of a 1000 ft. x 200 ft. outcrop area containing several shear zones up to several feet wide in slate and graywacke of the Tertiary Orca Group (Nelson and others, 1985). Sulfides, including bornite, chalcopyrite, pyrrhotite, and sphalerite, occur as lenses and disseminations both in the country rocks and in the shear zones (Jansons and others, 1984). Samples collected and analyzed by the U.S. Bureau of Mines showed the following results. Seven chip samples contained 39 ppm to 2.3 percent Cu, 68 ppm to 5.9 percent Zn, and <0.1 ppm to 29 ppm Ag. Seven grab samples contained 36 ppm to 14.8 percent Cu, 58 ppm to 8.7 percent Zn, and 0.1 ppm to 8 oz. Ag/ton.
Geologic map unit	(-145.320996115086, 60.6194717586009)

Geologic description

This occurrence consists of a 1000 ft. x 200 ft. outcrop area containing several shear zones up to several feet wide in slate and graywacke of the Tertiary Orca Group (Nelson and others, 1985). Sulfides, including bornite, chalcopyrite, pyrrhotite, and sphalerite, occur as lenses and disseminations both in the country rocks and in the shear zones (Jansons and others, 1984). Samples collected and analyzed by the U.S. Bureau of Mines showed the following results. Seven chip samples contained 39 ppm to 2.3 percent Cu, 68 ppm to 5.9 percent Zn, and <0.1 ppm to 29 ppm Ag. Seven grab samples contained 36 ppm to 14.8 percent Cu, 58 ppm to 8.7 percent Zn, and 0.1 ppm to 8 oz. Ag/ton.

Geologic map unit

(-145.320996115086, 60.6194717586009)

Production and reserves

Workings or exploration	Samples collected and analyzed by the U.S. Bureau of Mines showed the following results. Seven chip samples contained 39 ppm to 2.3 percent Cu, 68 ppm to 5.9 percent Zn, and <0.1 ppm to 29 ppm Ag. Seven grab samples contained 36 ppm to 14.8 percent Cu, 58 ppm to 8.7 percent Zn, and 0.1 ppm to 8 oz. Ag/ton (Jansons and others, 1984).
Indication of production	None
Reserve estimates	Inferred reserves of 19,300 tons @ 1.06% Cu, 2.06% Zn, and 13.6 ppm Ag (Jansons and others, 1984).
Additional comments Occurrence is in the Chugach National Forest.

References

MRDS Number	10307384
References Jansons, Uldis, Hoekzema, R.B., Kurtak, J.M., and Fechner, S.A., 1984, Mineral occurrences in the Chugach National Forest, southcentral Alaska: U.S. Bureau of Mines Mineral Land Assessment 5-84, 218 p., 2 sheets, scale 1:250,000. Nelson, S.W., Dumoulin, J. A., and Miller, M.L., 1985, Geologic map of the Chugach National Forest, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-1645-B, 16 p., 1 sheet, scale 1:250,000.
Reporters	S.W. Nelson, Anchorage, AK
Last report date	6/10/2000