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Byers

Occurrence, Inactive

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Commodities and mineralogy

Main commodities Cu
Other commodities Au; Cu; Zn
Ore minerals chalcopyrite; pyrite; pyrrhotite; sphalerite
Gangue minerals clay shear gouge

Geographic location

Quadrangle map, 1:250,000-scale SR
Quadrangle map, 1:63,360-scale D-2
Latitude 60.867
Longitude -147.4248
Nearby scientific data Find additional scientific data near this location
Location and accuracy The occurrence is located on southeastern Fairmount Island in the S1/2 section 13, T. 9 N., R. 11 E., of the Seward Meridian. This is location 194 of Tysdal (1978) and location S-113 of Jansons and others (1984). This location is accurate to within half a mile.

Geologic setting

Geologic description

The country rock in the area of this occurrence is sedimentary strata of the Tertiary Orca Group (Cobb and Tysdal, 1980). The occurrence is in graywacke and consists of a 2-foot-wide clay-rich shear zone containing a lens of massive chalcopyrite, pyrite, pyrrhotite, and sphalerite (Jansons and others, 1984). The U.S. Bureau of Mines sampled this occurrence and collected a chip sample that contained 1.7 percent zinc, 0.1 percent copper, and 1.59 ppm gold (Jansons and others, 1984).
Geologic map unit (-147.42686120322, 60.866469062502)
Mineral deposit model Besshi massive sulfide (Cox and Singer, 1986; model 24b)
Mineral deposit model number 24b
Age of mineralization Tertiary or younger; the deposit is in graywacke of the Tertiary Orca Group.

Production and reserves

Workings or exploration The U.S. Bureau of Mines sampled this occurrence; a chip sample contained 1.7 percent zinc, 0.1 percent copper, and 1.59 ppm gold (Jansons and others, 1984).
Indication of production None

References

MRDS Number A010356

References

Cobb, E.H., and Tysdal, R.G., 1980, Summaries of data on and list of references to metallic and selected nonmetallic mineral deposits in the Blying Sound and Seward quadrangle, Alaska: U.S. Geological Survey Open-File Report 80-621, 276 p.
Condon, W.H., and Cass, J.T., 1958, Map of a part of the Prince William Sound area, Alaska, showing linear geologic features as shown on aerial photographs: U.S. Geological Survey Miscellaneous Investigations Series Map I-273, 1 sheet, scale 1:125,000.
Grant, U.S., and Higgins, D.F., Jr., 1909, Notes on geology and mineral prospects in the vicinity of Seward, Kenai Peninsula: U.S. Geological Survey Bulletin 379-C, p. 98-107.
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.
MacKevett, E.M., Jr., and Holloway, C.D., 1977, Map showing metalliferous and selected non-metalliferous mineral deposits in the eastern part of southern Alaska: U.S. Geological Survey Open-File Report 77-169-A, 99 p., 1 sheet, scale 1:1,000,000.
Tysdal, R.G., 1978, Mines, prospects, and occurrences map of the Seward and Blying Sound quadrangles, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-880-A, 2 sheets, scale 1:250,000.
Reporters Jeff A. Huber (Anchorage)
Last report date 1/31/2000