|Quadrangle map, 1:250,000-scale||CR|
|Quadrangle map, 1:63,360-scale||B-5|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||This occurrence is on the west coast of Baker Island, about 0.2 mile northwest of Dalton Hot Springs. It is west of the center of section 25, T. 75 S., R. 77 E. The location is accurate.|
Geologic descriptionA quartz vein in granodiorite can be traced for about 200 feet along the shoreline (Maas and others, 1991, 1995). The vein contains chalcopyrite, marcasite, pyrite, and pyrrhotite. A 0.5 foot sample contained 1,294 parts per billion gold and 11.23 ounces of silver per ton (Maas and others, 1991, 1995). The vein is at or near the contact between a Cretaceous granitic pluton and Silurian Heceta Limestone (Eberlein and others, 1983; Brew, 1996).
|Geologic map unit||(-133.647281733626, 55.3360202843361)|
|Mineral deposit model||Polymetallic vein (Cox and Singer, 1986; model 22c).|
|Mineral deposit model number||22c|
|Age of mineralization||Probably related to the emplacement of the Cretaceous granitic host rock.|
|Workings or exploration||Only sampling by government geologists.|
|Indication of production||None|
Brew, D.A., 1996, Geologic map of the Craig, Dixon Entrance, and parts of the Ketchikan and Prince Rupert quadrangles, southeastern Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-2319, 53 p., 1 sheet, scale 1:250,000.
Eberlein, G.D., Churkin, Michael, Jr., Carter, Claire, Berg, H.C., and Ovenshine, A. T., 1983, Geology of the Craig quadrangle, Alaska: U.S. Geological Survey Open-File Report 83-91, 52 p.
Maas, K.M., Bittenbender, P E., and Still, J.C., 1995, Mineral investigations in the Ketchikan mining district, southeastern Alaska: U.S. Bureau of Mines Open-File Report 11-95, 606 p.
|Reporters||D.J. Grybeck (Applied Geology)|
|Last report date||5/1/2004|