|Quadrangle map, 1:250,000-scale||MK|
|Quadrangle map, 1:63,360-scale||A-3|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||This occurrence is about 3.5 miles northwest of Hagelbargers Pass near the headwaters of Katmai River. It is at an elevation of about 1,300 feet in the SW1/4 sec. 31, T. 22 S., R. 33 W., of the Seward Meridian. The location is accurate within one-half mile.|
Geologic descriptionThis occurrence is in Upper Tertiary, propylitically-altered, volcanic rocks, that contain banded quartz veins, generally one to five mm thick and finely disseminated pyrite (Church, Riehle, and Goldfarb, 1993). The veins contain quartz, smectite-illite mixed-layer clay, and stilbite. Samples generally contain from 0.15 to 0.45 parts per million (ppm) gold with a maximum value of 2.2 ppm, and up to to 300 ppm arsenic, 200 ppm molybdenum, and 3 ppm silver. The dark color of the quartz bands is due to finely dispersed jordisite (MoS2) (Church, Riehle, and Goldfarb, 1993). The occurrence may represent veining above a concealed low-F porphyry Mo deposit (Church, Riehle, and Goldfarb, 1993).
|Geologic map unit||(-154.749754087188, 58.2288092392916)|
|Mineral deposit model||Polymetallic vein, epithermal gold vein (Cox and Singer, 1986; model 22c, 25).|
|Mineral deposit model number||22c, 25|
|Age of mineralization||Late Tertiary or younger; the veins are in the volcanic rocks of the Aleutian volcanic arc.|
|Alteration of deposit||Wall rocks are propylitically altered and contain disseminated pyrite.|
|Workings or exploration||Apparently only sampling by government geologists.|
|Indication of production||None|
Additional commentsThis occurrence is in Katmai National Monument.
Church, S.E., Riehle, J.R., and Goldfarb, R.J., 1993, Interpretation of exploration geochemical data for the Mount Katmai quadrangle, and adjacent parts of the Afognak and Naknek quadrangles, Alaska: U.S. Geological Survey Bulletin 2020, 67 p., 3 plates, scale 1:250,000.
|Reporters||F.H. Wilson, S.E. Church, and D.P. Bickerstaff (U.S. Geological Survey)|
|Last report date||8/31/2005|