|Quadrangle map, 1:250,000-scale||KC|
|Quadrangle map, 1:63,360-scale||A-5|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||This occurrence is at an elevation of about 2000 feet on Blunt Mountain, about 0.15 mile east of the summit. The site is in section 3, T. 78 S., R. 93 E., of the Copper River Meridian. It corresponds to loc. 30 in Berg (1972 [I 684]), loc. 144 in Elliott and others (1978), and loc. 40 in Karl (1992). The location is accurate within a few hundred feet.|
Geologic descriptionThe country rock in the area of this site is Silurian trondhjemite that was regionally metamorphosed to greenschist grade in Late Cretaceous time (Berg, 1972). The occurrence is in sericitized trondhjemite, and consists of sparse galena, hematite(?), and pyrite in iron-stained quartz fissure veins and pods up to 10 feet thick.
|Geologic map unit||(-131.395681320685, 55.138658994222)|
|Mineral deposit model||Polymetallic veins (Cox and Singer, 1986; model 22c)|
|Mineral deposit model number||22c|
|Age of mineralization||Fissure veins probably are Late Cretaceous or younger.|
|Alteration of deposit||Sericitization of trondhjemite, and oxidation of iron mineral(s) in veins to hematite(?).|
|Indication of production||None|
Berg, H.C., 1972, Geologic map of Annette Island, Alaska: U.S. Geological Survey Miscellaneous Geologic Investigations Map I-684, 8 p., 1 sheet, scale 1:63,360.
|Reporters||H.C. Berg, USGS|
|Last report date||7/6/1999|