|Quadrangle map, 1:250,000-scale||TK|
|Quadrangle map, 1:63,360-scale||D-2|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||This occurrence is at an elevation of about 3,680 feet, northwest of lower Jay Creek. It is 0.6 mile north of hill 4008, in the SW1/4 sec. 19, T. 32 N., R. 9 E., Seward Meridian. The location is accurate to within 1/4 mile. The occurrence is locality B30 of Kurtak and others (1992).|
Geologic descriptionThe rocks in the vicinity of this occurrence are felsic(?) and intermediate to mafic metavolcanic rocks, chlorite schist, and sericite schist (Csejtey and others, 1978; Kurtak and others, 1992). The rocks are cut by quartz veins, locally stained tan-orange, that contain finely disseminated hematite, pyrrhotite, and pyrite (Kurtak and others, 1992). The U.S. Bureau of Mines sampled the stained areas in 1988 (Kurtak and others, 1992). Pyritic schist contains up to 212 parts per million zinc, and hematite-rich rock contains up to 124 parts per million copper. Gold values vary up to 10 parts per billion and silver values to 0.5 parts per million . Intermediate intrusive rocks in the area sampled by the U.S. Geological Survey contain up to 550 parts per million copper, 1 part per million silver, and 200 parts per million arsenic (Miller and others, 1978).
|Geologic map unit||(-147.836736596572, 62.840740550226)|
|Mineral deposit model||Porphyry Cu-Au? (Cox and Singer, 1986; model 20c?)|
|Mineral deposit model number||20c?|
|Alteration of deposit||Local bleaching and iron staining (Kurtak and others, 1992).|
|Workings or exploration||Only surface sampling by the U.S. Bureau of Mines (Kurtak and others, 1992) and the U.S. Geological Survey (Miller and others, 1978).|
|Indication of production||None|
Additional commentsMAS/MILS number 20760113.
Csejtey, Bela, Jr., Nelson, W.H., Jones, D.L., Silberling, N.J., Dean, R.M., Morris, M.S., Lanphere, M.A., Smith, J.G., and Silberman, M.L, 1978, Reconnaissance geologic map and geochronology, Talkeetna Mountains quadrangle, northern part of Anchorage quadrangle, and southwest part of Healy quadrangle, Alaska: U.S. Geological Survey Open-File Report 78-558-A, 60 p., 1 sheet, scale 1:250,000.
Kurtak, J.M., Southworth, D.D., Balen, M.D., and Clautice, K.H., 1991, Mineral investigations in the Valdez Creek Mining District, south-central Alaska: U.S. Bureau of Mines Open-File Report 1-92, 658 p., 2 sheets, scale 1:250,000.
|Reporters||R.K. Rogers (U. S. Geological Survey contractor)|
|Last report date||10/4/2002|