|Quadrangle map, 1:250,000-scale||RB|
|Quadrangle map, 1:63,360-scale||B-5|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||Ophir Creek is a southwest-flowing tributary of the Sulatna River and is approximately 8 miles long. Coordinates corresponding to location 25 of Cobb (1972 [MF405]) are for the approximate midpoint of placer ground, in section 30, T. 14 S., R. 18 E., Kateel River Meridian. The location is accurate.|
Geologic descriptionThe bedrock underlying Ophir Creek is intermediate to mafic intrusive rocks and is probably greenstone (Puchner and others, 1998). An unnamed rich gold discovery was reported along Ophir Creek in 1913 (Eakin, 1914). There was some mining in and about 1956 (Cass, 1959; Eberlein and others, 1977). Additional mining and(or) exploration occurred between 1988 and 1991 (Green and others, 1989; Bundtzen and others, 1990; Swainbank and others, 1991; Bundtzen and others, 1992).
|Geologic map unit||(-155.388475917643, 64.2524185878301)|
|Mineral deposit model||Placer Au (Cox and Singer, 1986; model 39a).|
|Mineral deposit model number||39a|
|Age of mineralization||Quaternary.|
|Workings or exploration||Exploration and discovery of gold took place along Ophir Creek in 1913, and some mining took place in and about 1956 (Cass, 1959; Eberlein and others, 1977). Additional mining and(or) exploration took place between 1988 and 1991 (Green and others, 1989; Bundtzen and others, 1990; Swainbank and others, 1991; Bundtzen and others, 1992).|
|Indication of production||Yes; small|
Bundtzen, T.K., Swainbank, R.C., Wood, J.E., Clough, A.H., 1991 (1992), Alaska's Mineral Industry 1991: Alaska Division of Geological & Geophysical Surveys, Special Report 46, 89 p.
Cass, J.T., 1959, Reconnaissance geologic map of the Ruby quadrangle, Alaska: U.S. Geological Survey Miscellaneous Geologic Investigations Map I-289, 1 sheet, scale 1:250,000.
Cobb, E.H., 1972, Metallic mineral resources map of the Ruby quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-405, 1 sheet, scale 1:250,000.
Cobb, E.H., and Chapman, R.M., 1981, Mineral occurrences (other than mineral fuels and construction materials) in the Kantishna River and Ruby quadrangles, Alaska: U.S. Geological Survey Open-File Report 81-170, 94 p.
Eakin, H.M., 1914, Placer mining in the Ruby district: U.S. Geological Survey Bulletin 592-J, p. 363-369.
Eberlein, G.D., Chapman, R.M., Foster, H.L., and Gassaway, J.S., 1977, Map and table describing known metalliferous and selected nonmetalliferous mineral deposits in central Alaska: U.S. Geological Survey Open-File Report 77-168-D, 132 p., 1 sheet, scale 1:1,000,000.
Green, C.B., Bundtzen, T.K., Peterson, R.J., Seward, A.F., Deagan, J.R., and Burton, J.E., 1989, Alaska's mineral industry, 1988: Alaska Division of Geological and Geophysical Surveys Special Report 43, 79 p.
Mertie, J.B., Jr., and Harrington, G.L., 1916, Mineral resources of the Ruby-Kuskokwim region, in Brooks, A.H., and others, Mineral Resources of Alaska, Report on Progress of Investigations in 1915: U.S. Geological Survey Bulletin 642-H, p. 223-266.
Puchner, C.C., Smith, G.M., Flanders, R.W., Crowe, D.E., and McIntyre, S.C., 1998, Bedrock geology of the Ruby-Poorman mining district, Alaska: Alaska Division of Geological and Geophysical Surveys Report of Investigations 98-11, 12 p., 3 sheets, scale 1:63,360.
|Reporters||C.E. Cameron (Alaska Division of Geological and Geophysical Surveys)|
|Last report date||3/22/2000|