O'Hara

Prospect, Inactive

Commodities and mineralogy

Main commodities Ag; Pb; Zn
Other commodities Cd
Ore minerals galena; marcasite; pyrite; pyrrhotite; sphalerite
Gangue minerals tourmaline

Geographic location

Quadrangle map, 1:250,000-scale MC
Quadrangle map, 1:63,360-scale B-8
Latitude 61.3338
Longitude -143.8415
Nearby scientific data Find additional scientific data near this location
Location and accuracy This prospect is on the northwest flank of Nelson Mountain. It is at an elevation of about 4,500 feet, 3,500 feet northwest of elevation 5457 (Cho), and 4,800 feet southwest of elevation 3319 (O'Hara). The site is 1,500 feet west of the center of section 20, T. 6 S., R. 9 E. of the Copper River Meridian. This is locality 59 of MacKevett (1976); the location is accurate to within about 1,000 feet.

Geologic setting

Geologic description

The deposit at this prospect consist of veins up to 8 inches thick that contain galena, sphalerite, pyrite, marcasite, and pyrrhotite. They cut Permian marble which locally also contains some disseminated tourmaline, pyrite, pyrrhotite, and sphalerite (Berg and Cobb, 1967, p. 64; MacKevett, 1976). The deposits were explored by 2 or 3 short adits driven about 1940.
Geologic map unit (-143.843571465664, 61.3333372336605)
Mineral deposit model Vein and disseminated
Age of mineralization Permian or younger based on the age of the host rock.

Production and reserves

Workings or exploration The deposits were explored by two or three short adits driven about 1940.
Indication of production Undetermined

Additional comments

The locality is in the Wrangell-Saint Elias National Park and Preserve.

References