Geologic descriptionHoare and Coonrad (1959) report that a stibnite-bearing quartz vein cuts rhyolite at this location. Frost (1990) and Frost and others (1992), report analytical data for two stibnite-quartz samples from this site that contain up to 1 ppm Au, 7 ppm Ag, 1,500 ppm As, and greater than 10,000 ppm Sb. Box and others (1993) show a small felsic stock intruding hornfels in sedimentary rocks of the mid-Cretaceous Kuskokwim Group in this area. Isotopic dating of similar intrusive rocks elsewhere in the Bethel quadrangle has yielded ages of 62 to 66 Ma (Box and others, 1993). Frost (1990). |
Geologic map unit |
(-159.722279730275, 60.8192679595226) |
Mineral deposit model |
Simple Sb deposit (Cox and Singer, 1986; model 27d). |
Mineral deposit model number |
27d |
Age of mineralization |
Late Cretaceous or Early Tertiary; assumed to be related to emplacement of felsic intrusive rocks in the area. The intrusive stock at Marvel Dome, about 12 miles to the north, has yielded K/Ar ages of 65.1 +/- 2.0 and 66.6 +/- 2.0 Ma (Box and others, 1993). An intrusive stock at the head of Dome Creek about 12 miles to the south-southeast has yielded an Ar/Ar age of 62.2 +/- 1.9 Ma (Box and others, 1993). |