|Quadrangle map, 1:250,000-scale||MG|
|Quadrangle map, 1:63,360-scale||B-1|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||This unnamed occurrence is located on a flattened, south-facing spur overlooking the headwaters of the Jones River; it is at an elevation of 5,200 feet (1,585 m) in the SE1/4 sec. 33, T. 28 N., R. 21 W., of the Seward Meridian. The reporter visited the site in 1984; at station nos. 84BT104 and 84BT147.|
This unnamed occurrence consists of a mineralized quartz-carbonate breccia zone in a small composite pluton of Late Cretaceous (79 Ma) age (Solie and others, 1991). The pluton averages diorite in composition; it covers an equant, one square kilometer area, and intrudes the sandstone, siltstone, and silty limestone of the mid-Silurian Terra Cotta Mountains Sandstone, a unit of the Dillinger subterrane (Bundtzen, Harris, and Gilbert, 1997).The deposit consists of disseminated chalcopyrite, pyrite, and a trace of galena in an intrusive hosted, quartz-carbonate breccia. Total sulfides amount to no more than 1 percent of the total mineralized zone. No surface measurements of the mineralized area are available. No assay data is available. Metallic content is based on field identification of sulfide minerals.
|Geologic map unit||(-153.171231384735, 62.4674088336349)|
|Mineral deposit model||Polymetallic replacement? (Cox and Singer, 1986; model 19a?).|
|Mineral deposit model number||19a?|
|Alteration of deposit||Extensive carbonate alteration.|
|Workings or exploration||The reporter examined the site in 1984. No assay data is available. Metallic content is based on field identification of sulfide minerals.|
|Indication of production||None|
Bundtzen, T.K., Harris, E.E., and Gilbert, W.G., 1997, Geologic Map of the eastern McGrath quadrangle, Alaska: Alaska Division of Geological and Geophysical Surveys Report of Investigations 97-14, 34 p., 1 sheet, scale 1:125,000.
|Reporters||T.K. Bundtzen (Pacific Rim Geological Consulting)|
|Last report date||12/10/1998|