|Quadrangle map, 1:250,000-scale||FB|
|Quadrangle map, 1:63,360-scale||D-3|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||The Blue Bonanza mine is located in the NW1/4NE1/4 sec. 25, T. 1 N., R. 3 W., Fairbanks Meridian. This mine is on the divide between Sheep Creek and Nugget Creek at an elevation of about 1,900 feet. It is about 0.7 mile north of the top of Ester Dome. The mine is locality 8 of Cobb (1972 [MF 410]).|
Geologic descriptionOre was mined from a rich quartz vein that was 18 inches thick at the surface and narrowed with depth. Two periods of vein formation have been described. The older quartz is crushed and has cavities, whereas the younger quartz has glassy crystals and is banded parallel to walls (Smith, 1913 [B 525]). Gold is visible both near and remote from sulfides. The sulfides are galena, pyrite, and some stibnite; considerable silver is present in tetrahedrite. By 1914, a shaft was driven to a depth of 130 feet; however, the richest ore was concentrated in a zone 12 to 15 feet below the surface (Chapin, 1914 [B 592-J, p. 321-355]). Hill (1933) described a quartz vein on the property as being 5 to 6 inches wide and oriented N. 10 W., dipping 65 E. A grab sample from the dump contained $9.22 of gold per ton (0.45 ounce of gold per ton) (Hill, 1933).
|Geologic map unit||(-148.062433053047, 64.8905626076257)|
|Mineral deposit model||Schist-hosted gold-quartz vein|
|Workings or exploration||The mine was developed by a 35-degree inclined shaft at least 30 feet deep; the richest ore was concentrated in a zone 12 to 15 feet below the surface (Chapin, 1914 [B 592-J, p. 321-355]).|
|Indication of production||Yes; small|
Chapin, Theodore, 1914, Lode mining near Fairbanks, Alaska: U.S. Geological Survey Bulletin 592-J, p. 321-355.
Chapman, R.M., and Foster, R.L., 1969, Lode mines and prospects in the Fairbanks district, Alaska: U.S. Geological Survey Professional Paper 625-D, 25 p., 1 plate.
Cobb, E.H., 1972, Metallic mineral resources map of the Fairbanks quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-410, 1 sheet, scale 1:250,000.
Cobb, E.H., 1976, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Fairbanks quadrangle, Alaska: U.S. Geological Survey Open-File Report 76-662, 174 p.
Hill, J.M., 1933, Lode deposits of the Fairbanks district, Alaska: U.S. Geological Survey Bulletin 849-B, p. 29-163.
Killeen, P.L., and Mertie, J.B., 1951, Antimony ore in the Fairbanks District, Alaska: U.S. Geological Survey Open-File Report 51-46, 43 p.
Smith, P.S., 1913, Lode mining near Fairbanks, in Prindle, L.M., A geologic reconnaissance of the Fairbanks quadrangle, Alaska: U.S. Geological Survey Bulletin 525, p. 153-216.
|Reporters||J.R. Guidetti Schaefer and C.J. Freeman (Avalon Development Corporation)|
|Last report date||7/31/2001|