Banzer (ARDF #CV024) Au, Cu, Pb, Zn

Banzer

Prospect, Inactive

Commodities and mineralogy

Main commodities	Au; Cu; Pb; Zn
Ore minerals	chalcopyrite; galena; pyrite; pyrrhotite
Gangue minerals	calcite; quartz

Geographic location

Quadrangle map, 1:250,000-scale	CV
Quadrangle map, 1:63,360-scale	D-7
Latitude	60.81
Longitude	-146.54
Nearby scientific data	Find additional scientific data near this location
Location and accuracy	The Banzer prospect is at an elevation of less than 100 feet, about 0.75 mile northeast of Graveyard Point at the mouth of Landlocked Bay. It is in the NW1/4 sec. 19, T. 12 S., R. 7 W., of the Copper River Meridian. The location of the site is accurate to within 2000 ft. This site is loc. C- 67 in Jansons and others (1964) and loc. 17 in Cobb (1972: MF-392).

Geologic setting

Geologic description The Banzer prospect consists of sulfide-bearing quartz-calcite veins and of irregular clumps and stringers of sulfides in mafic volcanic rocks of the Tertiary Orca Group (Nelson and others, 1985; Cobb, 1979: OF 79-973). Sulfides reportedly include chalcopyrite, galena, pyrite, and pyrrhotite. Capps and Johnson (1915) reported that there were two shafts and more than 200 feet of stripping completed by 1912. Assays of ore yielded values of 2.42 oz. Au/ton. The prospect could not be located in the early 1980s but assays of two grab samples of float from the general area of the prospect contained 0.08 ppm to 0.22 ppm Au, 0.1 ppm to 6.9 ppm Ag, and 22 ppm to 0.24% Cu (Jansons and others, 1984).
Geologic map unit	(-146.541996030256, 60.8094502570806)
Mineral deposit model	Cyprus massive sulfide (Cox and Singer, 1986; model 24a)
Mineral deposit model number	24a
Age of mineralization	Probably Tertiary based on the age of the host rock.

Production and reserves

Workings or exploration	Capps and Johnson (1915) reported that there were two shafts and more than 200 feet of stripping completed by 1912. Assays of ore yielded values of 2.42 oz. Au/ton. The prospect could not be located in the early 1980s but assays of two grab samples of float from the general area of the prospect contained 0.08 ppm to 0.22 ppm Au, 0.1 ppm to 6.9 ppm Ag, and 22 ppm to 0.24% Cu (Jansons and others, 1984).
Indication of production	None
Additional comments Crowe and others (1992; 1993) and Sainsbury (1993) discuss the genesis of the volcanogenic massive sulfide deposits in this area. Chugach Alaska Corporation, Anchorage, Alaska has control of these lands.

References

MRDS Number	A010430
References Capps, S.R., and Johnson, B.L., 1915, The Ellamar district, Alaska: U.S. Geological Survey Bulletin 605, 125 p. Cobb, E.H., 1972, Metallic mineral resources map of the Cordova quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-392, 1 sheet, scale 1:250,000. Cobb, E.H., 1979, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Cordova quadragle, Alaska: U.S. Geological Survey Open-file Report OF 79-973, 73 p. Crowe, D.E., Nelson, S.W., Brown, P.E., Valley, J.W., and Shanks, W.C., III, 1992, Geology and geochemistry of volcanogenic massive sulfide deposits and related igneous rocks, Prince William Sound region, south-central Alaska: Economic Geology, v. 87, no. 7, p. 1722-1746. Crowe, D.E., Nelson, S.W., Brown, P.E., Valley, J.W., and Shanks, W.C., III, 1993, Geology and geochemistry of volcanogenic massive sulfide deposits and related igneous rocks, Prince William Sound, south-central Alaska--Reply: Economic Geology, v. 88, p. 1285-1288. Nelson, S.W., Dumoulin, J. A., and Miller, M.L., 1985, Geologic map of the Chugach National Forest, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-1645-B, 16 p., 1 sheet, scale 1:250,000. Sainsbury, C.L., 1993, Geology and geochemistry of volcanogenic massive sulfide deposits and related igneous rocks, Prince William Sound, south-central Alaska, A discussion: Economic Geology, v. 88, p. 1284-1285.
Reporters	S.W. Nelson, Anchorage, AK
Last report date	6/10/2000