Natural Arches (north of Bering Glacier)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Cu
Ore minerals azurite; malachite; native copper
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale BG
Quadrangle map, 1:63,360-scale B-4
Latitude 60.4962
Longitude -142.4555
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is at the west end of the ridge between Bagley Ice Field and upper Bering Glacier. The map site is at an elevation of about 4,400 feet in the SW1/4 section 8, T 16 S, R 17 E, of the Copper River Meridian. This is locality 3 of Cobb (1972 [MF 373]; 1979 [OF 79-1246]). The location is probably accurate to within one-half mile.

Geologic setting

Geologic description

At this occurrence, native copper occurs in mafic volcanic rocks, and azurite and malachite occur in quartz veins that cut the volcanic rocks (Brabb and Miller, 1962). The volcanic rocks are part of the Lower Tertiary Orca Group (Hudson and Plafker, 1982).
Geologic map unit (-142.457419600746, 60.4957325451675)
Mineral deposit model Native copper in mafic volcanic rocks.
Age of mineralization Tertiary. The mineralization postdates the Early Tertiary age of the host volcanic rocks.
Alteration of deposit Oxidation.

Production and reserves

Workings or exploration Reconnaissance surface observations have been completed at this locality (Brabb and Miller, 1962).
Indication of production None

Additional comments

This occurrence is very close to the southern boundary of the Wrangell-St. Elias National Park.

References