Unnamed (on Mt. Brundage)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Cu
Ore minerals chalcopyrite; pyrrhotite

Geographic location

Quadrangle map, 1:250,000-scale TR
Quadrangle map, 1:63,360-scale B-5
Latitude 58.2713
Longitude -133.3457
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is on the south flank of Mt. Brundage near the international boundary. It is near the center of the W1/2 section 32, T.41 S., R.74 E. of the Copper River Meridian. This is location T007 of Wells and others (1986). The location is accurate within 1/4 mile.

Geologic setting

Geologic description

This occurrence is in the Coast Range plutonic-metamorphic complex which consists of high-grade schist and gneiss intruded by Cretaceous and Tertiary granodiorite (Brew and Ford, 1984). Brew and Ford (1985) describe the area as consisting predominately of sphene-bearing, biotite-hornblende granodiorite associated with a pendant of marble and calc-silicate granofels on the southwest flank of Mt. Brundage. Wells and others (1986), report traces of chalcopyrite and pyrrhotite in iron-stained siliceous gneiss here. Samples of this gneiss collected by the U.S. Geological Survey contain minor pyrrhotite and traces of chalcopyrite, but no significant metal values (Cobb, 1978 [OFR 78-698]).
Geologic map unit (-133.347427849677, 58.2709812736461)
Alteration of deposit Local iron staining.

Production and reserves

Indication of production None