|Quadrangle map, 1:250,000-scale||NB|
|Quadrangle map, 1:63,360-scale||A-1|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||This occurrence is on the east nose of the ridge between lower Baultoff Creek and Gravel Creek. It is near elevation 4119 near the southeast corner of SE1/4 of section 31, T. 4 N., R. 24 E. of the Copper River Meridian. This is locality 9 of Richter and others (1973), locality 56 of Richter and others (1975), and National Park Service locality WRST-82 (unpublished data). Cobb and Richter (1980) included this locality as an 'Unnamed occurrence'. It is located to within a few hundred feet.|
Geologic descriptionAt this occurrence, quartz veins with calcite and minor chalcopyrite cut a small quartz monzonite stock and its volcanic country rocks (Matson and Richter, 1971 [OFR 71-202]; Richter and others, 1975). A grab sample of a quartz-calcite vein contained 7 parts per million (ppm) silver, 15,000 ppm copper, 700 ppm chromium, 150 ppm nickel, 200 ppm zinc, and 300 ppm vanadium (Matson and Richter, 1971 [OFR 71-202]). The diorite stock intrudes upper Paleozoic volcanic rocks and is inferred to be Cretaceous (Richter and others, 1973).
|Geologic map unit||(-141.074630791621, 62.0726794511692)|
|Mineral deposit model||Quartz-calcite veins with chalcopyrite|
|Age of mineralization||Cretaceous or Tertiary; the diorite stock that hosts the deposit is inferred to be Cretaceous (Richter and others, 1973).|
|Indication of production||None|
Additional commentsThe occurrence is in the Wrangell-St. Elias National Preserve.
Cobb, E.H., and Richter, D.H., 1980, Summaries of data on and list of references to metallic and selected nonmetallic mineral deposits in the Nabesna quadrangle, Alaska: U.S. Geological Survey Open-File Report 80-927, 117 p.
Matson, N.A., Jr., and Richter, D.H., 1971, Geochemical data from the Nabesna A-1 quadrangle, Alaska: U.S. Geological Survey Open-File Report 71-0202, 10 p.
|Reporters||Travis L. Hudson (Applied Geology)|
|Last report date||11/24/2002|