|Quadrangle map, 1:250,000-scale||RM|
|Quadrangle map, 1:63,360-scale||A-3|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||Bonanza Creek is a southeast-flowing. tributary to upper Bear Creek. The coordinates are at about the center of the tailings on lower Bonanza Creek in about the center of section 4, T. 11 N., R. 59 W., of the Seward Meridian.|
Most of the early placer mining on Bonanza Creek was near the mouth of the creek where it cuts through bench and flood-plain deposits of Bear Creek (Maddren, (1915). It is not well documented but there was some mechanized mining for about a half mile up from the mouth of the creek in the 1980s or 1990s (?) based on the presence of tailings, the abandoned heavy equipment, and a small camp in the NW1/4 of section 4 (D.J. Grybeck, field work, 2006). There does not appear to be any significant dredging on Bonanza Creek above its mouth. In 2006, the local miners considered upper Bonanza Creek as too deep and wet to placer mine (personal communications to D.J. Grybeck, 2006).The bedrock on Bonanza Creek includes granitic rock with malachite-bearing quartz stringers (Maddren, 1915), but most of the bedrock in the Bonanza Creek drainage is Jurassic volcanic rocks locally intruded and thermally metamorphosed by mid-Cretaceous granitic rocks (Box and others, 1993; Wenz, 2005).
|Geologic map unit||(-159.761002686649, 61.0696698977797)|
|Mineral deposit model||Placer Au (Cox and Singer, 1986; model 39a).|
|Mineral deposit model number||39a|
|Age of mineralization||Quaternary.|
|Workings or exploration||There was at least some mining near the mouth of Bonanza Creek prior to 1915. There was also considerable mechanized mining for about a half mile above its mouth in the 1980s or 1990s (?) but apparently there has been no significant dredging on Bonanza Creek.|
|Indication of production||Yes; small|
|Production notes||Some unrecorded production into the 1990s but probably not large.|
Box, S. E, Moll-Stalcup, E. J., Frost, T. P., and Murphy, J. M., 1993, Preliminary geologic map of the Bethel and southern Russian Mission quadrangles, southwestern Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-2226-A, 20 p., scale 1:250,000.
Hoare, J M., and Cobb, E.H., 1972, Metallic mineral resources map of the Russian Mission quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-444, 1 sheet, scale 1:250,000.
Hoare, J.M., and Cobb, E.H., 1977, Mineral occurrences (other than mineral fuels and construction materials) in the Bethel, Goodnews, and Russian Mission quadrangles, Alaska: U.S. Geological Survey Open-File Report 77-156, 98 p.
Maddren, A.G., 1915, Gold placers of the lower Kuskokwim, with a note on copper in the Russian Mountains: U.S. Geological Survey Bulletin 622-H, p. 292-360.
|Reporters||Travis L. Hudson (Applied Geology) and Madelyn A. Millholland (Millholland & Associates); D.J. Grybeck (Port Ludlow, WA)|
|Last report date||3/4/2008|