|Main commodities||Cu; Fe|
|Ore minerals||chalcopyrite; magnetite|
|Quadrangle map, 1:250,000-scale||SI|
|Quadrangle map, 1:63,360-scale||D-8|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||This prospect is on the northeast flank of Mount Hill, about 1.3 miles southeast of the mouth of Stag Bay. The prospect is at an elevation of about 500 feet, 0.4 mile east-southeast of the center of sec. 4, T. 46 S., R. 56 E. It is location P-37 of Bittenbender and others (1999), MAS no. 0021140088 (U.S. Bureau of Land Management, 2002), and is included in location 7 of Cobb (1972, 1978). The location is accurate within about 0.2 mile.|
Johnson and Karl map two geologic units in the area of this prospect. One is the Freeburn assemblage, a collage of kilometer-scale, fault-bounded, lozenge-shaped blocks of Cretaceous and Cretaceous(?) metasedimentary and metavolcanic rocks. The other is Mesozoic or Paleozoic amphibolite, gneiss, schist, and marble. The contact between the units is the Border Ranges Fault, a northwest-striking, steeply-dipping or vertical regional fault that separates Cretaceous or younger rocks on the southwest from Mesozoic or Paleozoic rocks on the northeast. The prospect is on or near this fault.Bittenbender and others (1999), citing work by Asbury (1964) and Kimball (1982), describe the deposit as an iron-copper skarn in a fault near a diorite-gabbro contact with marble. Samples of the mineralized rock contained up to 51 percent iron, 0.93 percent titanium dioxide, and 100 parts per million copper. Workings included 3 trenches, one of which is caved.
|Geologic map unit||(-136.34213791521, 57.9087185491462)|
|Mineral deposit model||Fe skarn (Cox and Singer, 1986; model 18d).|
|Mineral deposit model number||18d|
|Alteration of deposit||Unspecified skarn minerals.|
|Workings or exploration||Workings included three trenches, one of which is caved.|
|Indication of production||None|
Additional commentsThe prospect is in West Chichagof-Yakobi Wilderness.
Asbury, D.W., 1964, Report on Vevelstad copper-iron property (Stag Bay): Alaska Division of Mines and Minerals Miscellaneous Report 114-10, 3 p.
Bittenbender, P., Still, J.C., Maas, K., and McDonald, M., Jr., 1999, Mineral resources of the Chichagof and Baranof Islands area, southeast Alaska: Bureau of Land Management, BLM-Alaska Technical Report 19, 222 p.
Cobb, E.H., 1972, Metallic mineral resources map of the Sitka quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-467, scale 1:250,000.
Cobb, E.H., 1978, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Sitka quadrangle: U.S. Geological Survey Open-File Report 78-450, 124 p.
Kimball, A.L., 1982, Mineral land assessment of Yakobi Island and adjacent parts of Chichagof Island, southeastern Alaska: U. S. Bureau of Mines Mineral Land Assessment report, MLA 97-82, 199 p.
U.S. Bureau of Land Management, 2002, Alaska mineral locations database report (Sitka quadrangle), July 2, 2002, 205 p. [http://imcg.wr.usgs.gov/dem.html]
|Reporters||H.C. Berg (U.S. Geological Survey)|
|Last report date||10/16/2004|