|Quadrangle map, 1:250,000-scale||SR|
|Quadrangle map, 1:63,360-scale||B-5|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||The occurrence is located in the SW1/4 section 27, T. 5 N., R. 5 E., of the Seward Meridian. It is along the north side of Falling Glacier on the east shore of Kings Bay and at an elevation of 660 feet. This is location 171 of Tysdal (1978 [MF-880-A]) and location S-92 of Jansons and others (1984). This location is accurate to within 300 feet.|
The occurrence consists of an iron-stained, laminated, siliceous mudstone that is locally cut by quart-feldspar veinlets near a granite contact. Traces of chalcopyrite and as much as 2 percent pyrite occur as disseminations and fracture fillings in the mudstone (Kurtak and Jeske, 1986). The mudstone is Orca Group of early Tertiary age (Nelson and others, 1985). The granite belongs to the informally named Nellie Juan granite, which has been dated as 35.5 +/-0.9 my old (Lanphere, 1966).One random chip sample across siliceous mudstone and quartz-feldspar veinlets contained 96 ppm copper (Kurtak and Jeske, 1986). A sample collected by Tysdal (1978 [MF-880-A]) contained 300 ppm chromite, 85 ppm copper, 100 ppm nickel, 50 ppm tin, and 90 ppm zinc.
|Geologic map unit||(-148.567070784896, 60.4916667819148)|
|Mineral deposit model||Low-sulfide Au-quartz veins (Cox and Singer, 1986; model 36a)|
|Mineral deposit model number||36a|
|Age of mineralization||Tertiary or younger; the mineralization is in rocks of the Orca Group of Tertiary age.|
|Alteration of deposit||The mudstone is iron-stained.|
|Workings or exploration||One random chip sample across siliceous mudstone and quartz-feldspar veinlets contained 96 ppm copper (Kurtak and Jeske, 1986). A sample collected by Tysdal (1978 [MF-880-A]) contained 300 ppm chromite, 85 ppm copper, 100 ppm nickel, 50 ppm tin, and 90 ppm zinc. No workings or improvements are reported.|
|Indication of production||None|
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.
Lanphere, M.A., 1966, Potassium-argon ages in Tertiary plutons in Prince Williams Sound region, Alaska, in Geological Survey Research 1966: U.S. Geological Survey Professional Paper 550-D, p. D195-D198.
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||12/1/2000|