Yellowband

Mine, Inactive

Commodities and mineralogy

Main commodities Au
Ore minerals gold
Gangue minerals calcite; quartz

Geographic location

Quadrangle map, 1:250,000-scale MC
Quadrangle map, 1:63,360-scale A-7
Latitude 61.0283
Longitude -143.401
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 setting

Geologic description

The 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.

Production and reserves

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 comments

The locality is in the Wrangell-Saint Elias National Park and Preserve.

References