|Quadrangle map, 1:250,000-scale||SR|
|Quadrangle map, 1:63,360-scale||B-3|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||The occurrence is located on the east side of Mallard Bay at an elevation of 250 feet. It is located in the NE1/4 section 1, T. 2 N., R. 9 E., of the Seward Meridian. This is location S-48 of Jansons and others (1984). This location is accurate to within a quarter of a mile.|
Geologic descriptionFrom near the shoreline several iron-stained mineralized shear zones, 3.5 to 12 feet wide, can be traced to an elevation of about 250 feet. The bedrock is greenstone of the Orca Group of early Tertiary age (Nelson and others, 1985). Stringers of massive pyrite, chalcopyrite, and quartz-epidote veins are concentrated along the zones (Kurtak and Jeske, 1986). The nearby gabbro-greenstone contact contains no visible mineralization. There is a one-foot-wide unmineralized breccia in the greenstone as well as epidote fracture fillings. Three chip samples were collected across mineralized zones in the greenstone. They contained from 50 ppm to 3.3 percent copper and as much as 140 ppm zinc (Kurtak and Jeske, 1986).
|Geologic map unit||(-147.808267416828, 60.2945443801523)|
|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.|
|Workings or exploration||No workings are reported in the literature. The U.S. Bureau of Mines visited the occurrence in the early 1980s and did not find any signs of prospecting. Three chip samples were collected across the 3.5- to 12-foot-wide mineralized zones in the greenstone; they contained from 50 ppm to 3.3 percent copper and as much as 140 ppm zinc (Kurtak and Jeske, 1986).|
|Indication of production||None|
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.
|Reporters||Jeff A. Huber and Carol S. Huber (Anchorage)|
|Last report date||11/25/2001|