|Quadrangle map, 1:250,000-scale||MF|
|Quadrangle map, 1:63,360-scale||B-2|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||
This site is on the northwest side of the mountain between Dundas Bay and the west arm of the Bay. The deposits are probably in the SW 1/4, section 22, T. 40 S., R. 54 E., of the Copper River Meridian. Mine workings mentioned by Stewart (1949) on the Red Top claims were at about 440-foot elevation. The location is probably within the old claim block and within about 0.25 mile of the site on the ground.The site is approximately the same as number 57 of MacKevett and others (1971) and number 66 of Kimball and others (1978).
Auriferous quartz veins occur in or near the contact zone of a foliated granitic intrusion of Cretaceous age and quartz-feldspar-hornblende gneiss of Paleozoic ancestry (Brew and others, 1978). The age of mineralization is believed to be Late Cretaceous or younger, as undeformed quartz veins occur in and cut foliated granitic rocks of Cretaceous age.The property consisted of about 47 lode claims when it was visited by Stewart of the Territorial Department of Mines in 1938 (Stewart, 1949). Stewart reported a steeply dipping quartz vein 1 to 2 feet thick near 440 feet elevation. In a later investigation, the U.S. Bureau of Mines (Kimball and others, 1978) found quartz veins near the approximate site of Stewart's examination. One quartz vein was 0.5 foot thick; another, in diorite country rock, was about 2 feet thick. A vein, sampled over 1.9 ft. width, contained 5 ppm silver, 250 ppm lead, and 0.275 ounce per ton gold.
|Geologic map unit||(-136.476845761379, 58.3816353634059)|
|Mineral deposit model||Low-sulfide gold-quartz vein (Cox and Singer, 1986; model 36a).|
|Mineral deposit model number||36a|
|Age of mineralization||Late Cretaceous or younger.|
|Workings or exploration||
Stewart (1949) reported mine workings and an auriferous quartz vein near 440 feet elevation above Dundas Bay. The vein was observed during an examination that he made in 1938. Kimball and others (1978) found mining debris, probably near Stewart's location. A 1.9 foot vein sampled by the Bureau of Mines in 1975 contained 0.275 oz/ton gold, 5 ppm silver and 250 ppm lead.The site appears to have been active in the late 1930s, with as least as many as 47 claims: 24 Sunrise, 15 Newsboy, and 8 Red Top. Stewart (1949) reported that, in 1933, 'Doc' Silver held two Red Top claims. The area is steep and brushy, but because of the evidence of mining activity found by the U.S. Bureau of Mines in 1975, the site is almost certainly at least partly coincident with the area of the 'Doc' Silver claims. The auriferous vein found by the U.S. Bureau of Mines may not, however, be the same vein that was reported by Stewart.
|Indication of production||None|
Additional commentsThe site is in Glacier Bay National Park and Preserve.
Brew, D.A., Johnson, B.R., Grybeck, D., Griscom, A., Barnes, D.F., Kimball, A.L., Still, J.C., and Rataj, J.L., 1978, Mineral resources of the Glacier Bay National Monument Wilderness Study Area, Alaska: U.S. Geological Survey Open-File Report 78-494, 670 p., 7 sheets.
Cobb, E.H., 1972, Metallic mineral resources map of the Mount Fairweather quadrangle, AK: U.S. Geological Survey Miscellaneous Field Study Map MF-436, 1 sheet, scale 1:250,000.
Kimball, A.L., Still, J.C., and Rataj, J.L., 1978, Mineral resources, in Brew, D. A., and others, Mineral resources of the Glacier Bay National Monument wilderness study area, Alaska: U.S. Geological Survey Open-File Report 78-494, p. C1-C375.
MacKevett, E.M., Jr., Brew, D.A., Hawley, C.C., Huff, L.C., and Smith, J.G., 1971, Mineral resources of Glacier Bay National Monument, Alaska: U.S. Geological Survey Professional Paper 632, 90 p., 12 plates, scale 1:250,000.
|Reporters||C.C. Hawley (Hawley Resource Group)|
|Last report date||4/14/1999|