|Quadrangle map, 1:250,000-scale||MC|
|Quadrangle map, 1:63,360-scale||A-7|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||The Yellowband mine is on the north side of a cirque at the head of an unnamed east tributary to Golconda Creek. It is at an elevation of about 5,200 feet, 7,000 feet north-northeast of peak 6635 and 6,000 feet east-northeast of the Bremner landing strip. This is locality 9 of MacKevett (1976); the location is probably accurate to within 1,000 feet. Cobb and MacKevett (1980) included this mine under the name 'Yellow Band'. The location of the Yellowband mine on the McCarthy A-7 topographic map (1959 edition) is incorrect.|
Geologic descriptionThe deposit at this mine consists of gold-bearing quartz veins generally less than 25 centimeters thick that are localized along steeply dipping felsic dikes (MacKevett (1976). Three open cuts in 1935 showed gold along fractures and in quartz-calcite veins and replacements along the faulted and brecciated hanging wall of a steeply-dipping felsic dike (Moffit, 1937). The dike is 12 to 15 feet thick, strikes N 5 W, and dips east. The deposits were developed by several hundred meters of underground workings and produced about 750 ounces of gold (Smith, 1942; MacKevett, 1976]). The veins and dikes cut Cretaceous Valdez Group metaflysch (MacKevett, 1978). Gold-bearing quartz veins in the Valdez Group are generally Early Tertiary in age (Goldfarb and others, 1997).
|Geologic map unit||(-143.403037316275, 61.027842491811)|
|Mineral deposit model||Low sulfide Au-quartz veins (Cox and Singer, 1986; model 36a)|
|Mineral deposit model number||36a|
|Age of mineralization||Early Tertiary. Gold-bearing quartz veins in the Valdez Group are generally Early Tertiary in age (Goldfarb and others, 1997).|
|Alteration of deposit||Silicification.|
|Workings or exploration||Open cuts explored the deposits in 1935, and by 1940 there were several hundred meters of underground workings (Smith, 1942; MacKevett, 1976).|
|Indication of production||Yes; small|
|Production notes||Total production was about 750 ounces of gold (MacKevett, 1976).|
Additional commentsThe locality is in the Wrangell-Saint Elias National Park and Preserve.
Cobb, E.H., and MacKevett, E.M., Jr., 1980, Summaries of data on and lists of references to metallic and selected nonmetallic mineral deposits in the McCarthy quadrangle, Alaska: U.S. Geological Survey Open-File Report 80-885, 156 p.
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.
MacKevett, E.M., Jr., 1976, Mineral deposits and occurrences in the McCarthy quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-773-B, 2 sheets, scale 1:250,000.
MacKevett, E.M., Jr., 1978, Geologic map of the McCarthy quadrangle, Alaska: U.S. Geological Survey Miscellaneous Investigations Series Map I-1032, 1 sheet, scale l:250,000.
Moffit, F.H., 1937, Recent mineral developments in the Copper River region: U.S. Geological Survey Bulletin 880-B, p. 97-109.
|Reporters||Travis L. Hudson (Applied Geology, Inc.)|
|Last report date||1/12/2003|