|Quadrangle map, 1:250,000-scale||GU|
|Quadrangle map, 1:63,360-scale||D-1|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||The Judy prospect is on Granite Creek 1 to 1.5 miles above its junction with Slana River. It is locality 20 of Richter and Matson (1972) and locality 10 of MacKevett and Holloway (1977). The prospect was explored by Kirk Stanley who gave its location as in Granite Creek about 1.5 miles above the Slana River (written communication, 2000).|
Geologic descriptionThe Judy prospect is a copper-gold skarn associated with limestone of uncertain affiliation that is intruded by quartz diorite. The prospect is an isolated occurrence exposed along Granite Creek for about 200 feet. It is masked by soil and heavy brush away from the creek and the outcrops are conspicuously stained with malachite. Pyrite and chalcopyrite are common; magnetite occurs locally in altered limestone. The prospect was drilled with shallow AX diameter core-holes; short intercepts of high-grade gold values were encountered.
|Geologic map unit||(-144.05222169417, 62.9896158409239)|
|Mineral deposit model||Copper-gold skarn (Cox and Singer, 1986; model 18a)|
|Mineral deposit model number||18a|
|Alteration of deposit||Contact metamorphism; formation of fine-grained garnet in limestone adjacent to quartz diorite.|
|Workings or exploration||The prospect was explored by short geophysical lines and small diameter diamond-drill core holes. The maximum depth of these holes was about 150 feet.|
|Indication of production||None|
Additional commentsThe best reference to this deposit is in a review of the 'Slana Mineral Belt prospects' by Kirk Stanley,' which is included in an interoffice memo of Ahtna Minerals Corp. (written communication to Wes Nason, 2000). This memo includes color photographs of the prospect. Additional information can be obtained from Ahtna Minerals in Anchorage, Alaska.
Cobb, E.H., 1979, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Gulkana quadrangle, Alaska: U.S. Geological Survey Open-File Report 79-1247, 36 p.
MacKevett, E.M., Jr., and Holloway, C.D., 1977, Map showing metalliferous and selected non-metalliferous mineral deposits in the eastern part of southern Alaska: U.S. Geological Survey Open-File Report 77-169-A, 99 p., 1 sheet, scale 1:1,000,000.
|Reporters||W.T. Ellis (Alaska Earth Sciences), C.C. Hawley (Hawley Resource Group), and W.J. Nokleberg (U.S. Geological Survey)|
|Last report date||12/4/2000|