|Quadrangle map, 1:250,000-scale||SI|
|Quadrangle map, 1:63,360-scale||C-7|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||The Handy and Andy patented claims extend southeast for about 0.5 mile from the east shore of upper Klag Bay. In part, the claims overlap the Chichagof Extension claims (Reed and Coats, 1941, pl. 14). For this record, the site is plotted at sea level at the northwest boundary of the patented ground in the SW1/4 sec. 31, T. 48 S., R. 58 E. It is locations P-78 and P-79 of Bittenbender and others (1999), locations 34 and 35 of Cobb (1972, 1978), and MAS nos. 0021140043 and 0021140301 (U.S. Bureau of Land Management, 2002). The location is accurate.|
Johnson and Karl (1985) map the rocks in the area of these prospects as Cretaceous graywacke and argillite interbedded with sparse, lenticular beds of basalt. The rocks are cut by numerous high-angle, mainly northwest-striking faults. They include the extensions of the fault at the Chichagof Mine (C7-19) which controls the mineralization there and crosses these prospects.
Reed and Coats (1941) report that the Andy claim is explored by a 57-foot tunnel driven along a small fault. A tunnel approximately 80 feet long and a winze on the Handy claim follows a fault that strikes N60W and dips 60SW in massive graywacke. Workings on the Chichagof Extension prospect include pits and open cuts that explore quartz veins up to 3 feet thick that strike N8-29W and dip steeply west to vertical. The country rock is slaty graywacke that strikes N56W and dips 70SW.
Bittenbender and others (1999), citing Still and Weir (1981), report that the U.S. Bureau of Mines sampled mineralized quartz veins in graywacke on the Handy prospect; the samples contained up to 0.12 ounce of gold per ton. The property was diamond-drilled between 1945 and 1953, but the results of that work have not been made public. There is no record of production from these prospects.Isotopic studies indicate that the gold-quartz veins in coastal southern and southeastern Alaska are Eocene, about 50 Ma in age (Haeussler, 1995; Goldfarb, 1997; Goldfarb and others, 1997). ARDF record SI087 provides an overview of the geology of auriferous quartz veins in the Chichagof Mining District.
|Geologic map unit||(-136.09142399365, 57.6576290050767)|
|Mineral deposit model||Low-sulfide gold-quartz vein (Cox and Singer, 1986; model 36a).|
|Mineral deposit model number||36a|
|Age of mineralization||Isotopic studies indicate that the gold-quartz veins in coastal southern and southeastern Alaska are Eocene, about 50 Ma in age (Haeussler and others, 1995; Goldfarb, 1997; Goldfarb and others, 1997).|
|Workings or exploration||The Andy claim was explored before WW II by a 57-foot tunnel, and the Handy claim by a tunnel approximately 80 feet long and a winze. Workings on the Chichagof Extension prospect included pits and open cuts. The Handy property was diamond-drilled between 1945 and 1953, but the results of that work have not been made public.|
|Indication of production||Undetermined|
|Production notes||There is no record of production from these prospects, but the assay data and the extent of the workings suggests that at least some gold was recovered.|
Additional commentsThe prospect is in West Chichagof-Yakobi Wilderness.
|MRDS Number||A013277; A013278|
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.
Goldfarb, R J., 1997, Metallogenic evolution of Alaska, in Goldfarb, R.J., and Miller, L.D., eds., Mineral Deposits of Alaska: Economic Geology Monograph 9, p. 4-34.
Goldfarb, R.J., Miller, L.D., Leach, D.L., and Snee, L.W, 1997, Gold deposits in metamorphic rocks in Alaska, in Goldfarb, R.J., and Miller, L.D., eds., Mineral Deposits of Alaska: Economic Geology Monograph 9, p. 151-190.
Haeussler, P J., Bradley, D., Goldfarb, R., Snee, L., and Taylor, C., 1995, Link between ridge subduction and gold mineralization in southern Alaska: Geology, v. 23, no. 11, p. 995-998.
Overbeck, R.M., 1919, Geology and mineral resources of the west coast of Chichagof Island: U.S. Geological Survey Bulletin 692-B, p. 91-136.
Reed, J.C., and Coats, R.R., 1941, Geology and ore deposits of the Chichagof mining district, Alaska: U.S. Geological Survey Bulletin 929, 148 p.
Still, J.C., and Weir, K.R., 1981, Mineral land assessment of the west portion of western Chichagof Island, Southeast Alaska: U.S. Bureau of Mines Open-File Report 89-81, 269 p., 12 sheets.
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|