|Quadrangle map, 1:250,000-scale||CR|
|Quadrangle map, 1:63,360-scale||B-4|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||This occurrence is at an elevation of about 1,100 feet about 1.1 mile east-northeast of Bautista Peak. It is about 0.3 mile southeast of the center of section 28, T. 74 S., R. 80 E.|
Geologic descriptionThis prospect is associated with a small Cretaceous granitic stock that makes up the center of San Juan Bautista island. The stock intrudes Devonian graywacke, mudstone, and siltstone of the Port Refugio Formation, which crops out along the entire coastline of the island (Eberlein and others, 1983; Brew, 1996). The occurrence consists of minor pyrite and chalcopyrite disseminated in diorite (Clark and others, 1970 [OF 418]).
|Geologic map unit||(-133.257300509456, 55.4209545958824)|
|Age of mineralization||Probably related to the emplacement of Cretaceous diorite.|
|Indication of production||None|
Additional commentsThe subsurface rights to the land in the vicinity of this prospect are held by the Sealaska Corporation.
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.
Clark, A.L., Berg, H.C., Grybeck, D.J., Ovenshine, A.T., and Wehr, Raymond, 1970, Analyses of rock and stream-sediment samples from the Craig B-4 quadrangle, Alaska: U.S. Geological Survey Open-File Report 418, 89 p.
Cobb, E. H., 1978, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Craig quadrangle, Alaska: U.S. Geological Survey Open-File Report 78-869, 262 p.
|Reporters||D.J. Grybeck (Applied Geology)|
|Last report date||5/1/2004|