Fisher Dome

Occurrence, Inactive

Commodities and mineralogy

Main commodities Sb
Other commodities Au
Ore minerals stibnite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale BH
Quadrangle map, 1:63,360-scale D-3
Latitude 60.82
Longitude -159.72
Nearby scientific data Find additional scientific data near this location
Location and accuracy This lode occurrence is 1.6 miles southeast of Fisher Dome and 1.4 miles due south of the headwaters of Fisher Creek. It is approximately located, perhaps within miles. The coordinates provided by Hoare and Cobb (1977) do not match the location shown by Cobb (1972 [MF 455]), which is the one used in this record. The map site is on the midline of the ridge at an elevation of about 2,500 feet, in the SE1/4 of section 34, T. 9 N., R. 39 W., of the Seward Meridian. This is locality 4 of Cobb (1972 [MF 455]) and of Hoare and Cobb (1977).

Geologic setting

Geologic description

Hoare 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).

Production and reserves

Workings or exploration There are no reports of exploration at this location.
Indication of production None

References

MRDS Number A013389
Reporters Travis L. Hudson
Last report date 3/24/2001