Eagles Nest (Eagle's Den)

Prospect, Inactive

Commodities and mineralogy

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

Geographic location

Quadrangle map, 1:250,000-scale MM
Quadrangle map, 1:63,360-scale C-3
Latitude 63.5091
Longitude -151.0036
Nearby scientific data Find additional scientific data near this location
Location and accuracy The Eagles Nest prospect (Cobb, 1980 [OFR 80-363]) is at an elevation of about 2400 feet, on the northwest flank of Busia Mountain south of Eldorado Creek. It is in the SE1/4 SE1/4 section 22, T. 16 S., R. 18 W., Fairbanks Meridian. The location is accurate. The prospect is location 6 of Bundtzen, Smith, and Tosdal (1976), C of Hawley and Associates (1978), 19 of MacKevett and Holloway (1977), and 11 (Eagle's Den) of Thornsberry, McKee, and Salisbury (1984).

Geologic setting

Geologic description

The Eagles Nest quartz-stibnite vein strikes about N60W and dips 55 NE. It is partly covered, but two outcrops and intervening float suggest that the vein is at least 400 feet long; locally it is at least 20 feet thick. The country rock is quartz-feldspar-mica schist of the Birch Creek Schist (Bundtzen, 1981).
At an elevation of about 2500 feet, the vein is at least 20 feet thick. It contains stibnite masses as much as a foot thick in a 3-foot-wide footwall zone of massive to brecciated quartz. The vein also crops out about 400 feet to the northeast, at an elevation of about 2300 feet. Selected, high-grade samples assayed as much as 44 percent antimony, up to 2.76 ounces of silver per ton, and 0.1-0.2 ppm of mercury (Hawley and Associates, 1978). The vein is similar to those at the Stampede (MM144) and Slate Creek mines (MM153).
Geologic map unit (-151.005883996058, 63.5085920800672)
Mineral deposit model Simple stibnite deposit (Cox and Singer, 1986; model 27d).
Mineral deposit model number 27d
Age of mineralization The deposit is assumed to be Eocene (see record MM091).

Production and reserves

Workings or exploration The vein was discovered by Jim Fuksa sometime before 1976; it has been explored by shallow, hand-dug and blasted open cuts.
Indication of production None

Additional comments

The prospect is in Denali National Park and Preserve.

References