|Quadrangle map, 1:250,000-scale||CR|
|Quadrangle map, 1:63,360-scale||C-5|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||This occurrence is accurately located near the northeast tip of Noyes Island, about 0.3 mile east of the center of section 17, T. 73 S., R. 78 E.|
Geologic descriptionMaas and others (1991) sampled an outcrop of brown-stained, silicified limestone on the beach. A 0.5-foot-thick quartz vein in it contained 21.7 parts per million silver, 0.89 percent lead, and 1.08 percent zinc. The limestone is probably part of the Karheen Formation of Devonian age (Eberlein and others, 1983; Brew, 1996).
|Geologic map unit||(-133.589350434485, 55.54034058026)|
|Mineral deposit model||Quartz vein with lead, silver, and zinc values.|
|Age of mineralization||The vein is in Devonian rocks.|
|Alteration of deposit||Silicification of limestone.|
|Workings or exploration||Only limited surface sampling.|
|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|