|Quadrangle map, 1:250,000-scale||BN|
|Quadrangle map, 1:63,360-scale||A-4|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||This is an area of placer gold mining on upper Ophir Creek (BN099). It is about 1,000 feet of the drainage just below the confluence of Ophir Creek and its northeast headwater tributary, Flat Creek. These workings start about 3.4 miles upstream of the confluence of Ophir Creek (BN099) and Crooked Creek. This is just above the section of Ophir Creek that flows through a narrow canyon-like valley. The north side of this canyon marks the southwest limit of the Late Pleistocene terminal moraine complex of the Pargon River valley. This is locality 78 of Cobb (1972; MF 417; 1975; OFR 75-429).|
Geologic descriptionThe Bendeleben A-4 topographic map shows placer mine workings over about 1,000 feet of the Ophir Creek just downstream from its confluence with Flat Creek. This may be the location referred to by Smith and Eakin (1911) as the bench at the head of the canyon that was being mined in 1903. This area is proximal to the Late Pleistocene terminal moraine complex of the Pargon River valley. The possible influence of outwash waters or sediments from this moraine complex on placer deposits of the Ophir Creek drainage is not known. The Ophir Creek (and Crooked Creek) placers were well developed, rich, and the product of more than one cycle of erosion and placer development. Perhaps drainage from the moraine complex did not flow down Ophir Creek.
|Geologic map unit||(-163.692628135841, 65.05627530713)|
|Mineral deposit model||Placer Au-PGE (Cox and Singer, 1986; model 39a)|
|Mineral deposit model number||39a|
|Age of mineralization||Quaternary|
|Workings or exploration||The Bendeleben A-4 quadrangle shows placer mine workings over about 1,000 feet of the Ophir Creek just downstream from its confluence with Flat Creek.|
|Indication of production||Yes; small|
Cobb, E.H., 1972, Metallic mineral resources map of the Bendeleben quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-417, 1 sheet, scale 1:250,000.
Cobb, E.H., 1975, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Bendeleben quadrangle, Alaska: U.S. Geological Survey Open-File Report 75-429, 123 p.
|Reporters||Travis L. Hudson (Applied Geology)|
|Last report date||3/15/1999|