|Quadrangle map, 1:250,000-scale||TR|
|Quadrangle map, 1:63,360-scale||B-5|
|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 descriptionThis 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.|
|Indication of production||None|
Brew, D.A., and Ford, A.B., 1984, The northern Coast plutonic-metamorphic complex, southeastern Alaska and northwestern British Columbia, in Coonrad, W.C., and Elliott, R.L., eds., The United States Geological Survey in Alaska--Accomplishments during 1981: U.S. Geological Survey Circular 868, p. 120-124.
Brew, D.A., and Ford, A.B., 1985, Preliminary reconnaissance geologic map of the Juneau, Taku River, Atlin, and part of the Skagway 1:250,000 quadrangles, southeastern Alaska: U.S. Geological Survey Open-File Report 85-395, 23 p., 2 sheets, scale 1:250,000.
Cobb, E.H., 1978, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Sumdum and Taku River quadrangles, Alaska: U.S. Geological Survey Open-File Report 78-698, 64 p.
|Reporters||J.C. Barnett and L.D. Miller (Juneau, Alaska)|
|Last report date||11/27/2001|