|Quadrangle map, 1:250,000-scale||JU|
|Quadrangle map, 1:63,360-scale||B-4|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||This occurrence is 1/2 mile south of Nun Mountain and 4 miles northwest of Mount Golub at an elevation of approximately 2,000 feet. It is near the northeast corner of section 13, T. 39 S., R. 61 E. of the Copper River Meridian. The location shown is accurate within 1/2 mile.|
Geologic descriptionThe general area is underlain by deformed and metamorphosed Silurian or Devonian carbonate, clastic and volcanic clastic rocks that have been intruded by Upper Jurassic and Lower Cretaceous granitic and dioritic rocks (Brew and others, 1992). This occurrence is one of several widely scattered skarn deposits in the area between Nun Mountain and just south of Mount Golub, where a Cretaceous granodiorite pluton intrudes a thick limestone unit (Clough and Redman, 1989). Numerous small garnet-epidote skarns occur along the contact between the granodiorite and the limestone. Wells and others (1986) describe pyrite veinlets in limestone and silicified argillite near a granodiorite contact at this locality. The U.S. Bureau of Mines noted several small, discontinuous garnet-epidote skarns up to a foot thick and several feet long, that contain sparse chalcopyrite and pyrite (Clough and Redman, 1989).
|Geologic map unit||(-135.255307318642, 58.4950679179711)|
|Mineral deposit model||Cu skarn deposit (Cox and Singer, 1986; model 18b)|
|Mineral deposit model number||18b|
|Workings or exploration||Surface samples only.|
|Indication of production||None|
Brew, D.A., Himmelberg, G.R., Loney, R.A., and Ford, A.B., 1992, Distribution and characteristics of metamorphic belts in the southeastern Alaska part of the North American Cordillera--Metamorphic styles in young and ancient orogenic belts: Journal of Metamorphic Geology, v. 10, no. 3, p. 465-482.
Clough, A.H., and Redman, E.C., 1989, Bureau of Mines mineral investigations in the Juneau mining district, Alaska, 1984-1988, Volume 2, Detailed mine, prospect, and mineral occurrence descriptions, Section C, West Lynn Canal subarea: U.S. Bureau of Mines of Mines Special Publication, 44 p.
|Reporters||J.C. Barnett and L.D. Miller (Juneau, Alaska )|
|Last report date||12/15/2001|