Eldorado No. 3

Prospect, Inactive

Commodities and mineralogy

Main commodities Sb
Other commodities Ag
Ore minerals kermesite; pyrite; stibiconite; stibnite
Gangue minerals carbonate minerals; quartz

Geographic location

Quadrangle map, 1:250,000-scale DN
Quadrangle map, 1:63,360-scale C-3
Latitude 63.5133
Longitude -151.0063
Nearby scientific data Find additional scientific data near this location
Location and accuracy The Eldorado prospect is at an elevation of about 1800 feet, on the north wall of the canyon of Eldorado Creek. It is about 0.3 mile east of the center of section 22, T.16S., R.18W., Fairbanks Meridian. The location is accurate. The prospect is number 37 of Hawley and Associates (1978), 13 of Thornsberry, McKee, and Salisbury (1984), and 13 of Bundtzen (1981).

Geologic setting

Geologic description

This prospect consists of a poorly exposed quartz-carbonate vein about 2 feet thick that strikes approximately northeast and cuts muscovitic marble of uncertain affiliation. The vein contains pyrite and stibnite; kermesite and stibiconite occur as secondary coatings on weathered vein material. The marble is silicified and brecciated. A 2-foot sample across the vein contained 3.2 percent antimony; a selected sample assayed 14.1 percent antimony and 0.81 ounce of silver per ton (Bundtzen, 1981; Thornsberry, McKee, and Salisbury, 1984, v. 2, number 13).
Geologic map unit (, )
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 DN091).
Alteration of deposit Oxidation of antimony minerals.

Production and reserves

Workings or exploration The vein is poorly exposed. It was discovered and staked by prospector-miner Jim Fuksa.
Indication of production None

Additional comments

The prospect is in Denali National Park and Preserve.