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Hemple

Occurrence, Inactive

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Commodities and mineralogy

Main commodities Cu; Zn
Ore minerals pyrrhotite
Gangue minerals epidote; quartz

Geographic location

Quadrangle map, 1:250,000-scale SR
Quadrangle map, 1:63,360-scale B-3
Latitude 60.325
Longitude -147.8058
Nearby scientific data Find additional scientific data near this location
Location and accuracy The occurrence is located near tidewater about a mile mile west of Chase island on the north shore of Drier Bay. It is in the NE1/4 section 25, T. 3 N., R. 9 E., of the Seward Meridian. This is location 224 of Cobb and Tysdal (1980) and location S-51 of Jansons and others (1984). This location is accurate to within a quarter of a mile.

Geologic setting

Geologic description

The occurrence consists of several 3-foot-wide intensely fractured and brecciated shear zones cutting greenstone of the Orca Group of early Tertiary age (Nelson and others, 1985). The deposit consists of quartz-epidote veins containing pyrrhotite. Samples collected from the site contained from 8 to 61 ppm copper and from 30 to 84 ppm zinc (Kurtak and Jeske, 1986).
Geologic map unit (-147.807865261763, 60.3244450061231)
Mineral deposit model Cyprus massive sulfide (Cox and Singer, 1986; model 24a)
Mineral deposit model number 24a
Age of mineralization Tertiary or younger; the mineralization is in rocks of the Orca Group of Tertiary age.

Production and reserves

Workings or exploration Samples collected from the site contained from 8 to 61 ppm copper and from 30 to 84 ppm zinc (Kurtak and Jeske, 1986). No workings or improvements are reported.
Indication of production None

References

References

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.
Kurtak, J.M., and Jeske, R.E., 1986, Mineral investigations in the Chugach National Forest, Alaska (Islands area): U.S. Bureau of Mines Open-File Report 54-86, 302 p., 1 sheet, scale 1:63,360.
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.
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 and Carol S. Huber (Anchorage)
Last report date 11/1/2001