|Quadrangle map, 1:250,000-scale||SR|
|Quadrangle map, 1:63,360-scale||A-3|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||The prospect is located at about 700 feet elevation about one-half mile east of the head of Northeast Arm, Mummy Bay. It is in the SW1/4 section 29, T. 2 N., R. 10 E., of the Seward Meridian. This is location 250 of Tysdal (1978 [MF-880-A]) and location S-30 of Jansons and others (1984). This location is accurate to within a quarter of a mile.|
Geologic descriptionThe country rock is greenstone of the Orca Group of early Tertiary age (Kurtak and Jeske, 1986). The prospect consists of a 145-foot-long adit driven along a north-trending shear zone. The shear zone is 2 to 3 feet wide and dips 80 E. The mineralization consists of massive chalcopyrite stringers with some quartz veins containing disseminated chalcopyrite (Kurtak and Jeske, 1986). As much as 1 percent native copper was identified in parts of the shear (Johnson, 1915). Two chip samples, each 3 feet wide, were collected from the adit. The samples contained 300 ppm and 0.25 percent copper, respectively (Kurtak and Jeske, 1986).
|Geologic map unit||(-147.76225502854, 60.2307355341111)|
|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||The workings on the prospect consist of a single south-trending adit that is 145 feet long. It is at an elevation of 700 feet. Two 3-foot-wide chip samples from the adit contained 300 ppm and 0.25 percent copper, respectively (Kurtak and Jeske, 1986).|
|Indication of production||None|
|Reserve estimates||The U.S. Bureau of Mines estimated inferred reserves of 200 tons of ore at a grade of 0.25 percent copper (Kurtak and Jeske, 1986).|
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.
Johnson, B.L., 1915, Mining on Prince William Sound: U.S. Geological Survey Bulletin 622-E, p. 131-139.
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.
|Reporters||Jeff A. Huber and Carol S. Huber (Anchorage)|
|Last report date||11/6/2001|