|Quadrangle map, 1:250,000-scale||ID|
|Quadrangle map, 1:63,360-scale||D-2|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||Spaulding Creek (which is not labeled by name on the USGS 1:63,360-scale topographic map) is a 6-mile-long tributary of Ganes Creek (ID011). The mouth of Spaulding Creek is about 0.5 mile south of the mouth of Six Gulch; the lower 2.4 miles of Spaulding Creek has been mined. The coordinates are at the mouth of Spaulding Creek in the SW1/4 SW1/4, section 17, T. 33 N., R. 38 W., of the Seward Meridian. The location is accurate. The Spaulding Creek Mine was described as locality 40 of Cobb (1972 [MF 363]); also described in Cobb (1976 [OFR 76-576]).|
Geologic descriptionSpaulding Creek is the largest auriferous tributary of Ganes Creek . Placer deposits have been mined for about 2.5 miles of lower Spaulding Creek, , mainly below outcrops of a swarm of Cretaceous and Tertiary dikes and sills. The swarm is the probable source of the placer gold (Bundtzen and Laird, 1982; Bundtzen and Miller, 1997; Bundtzen and others, 1987). The placer deposits consist of fluvial gravels from 3 to 15 thick, that are covered with 3 to 10 feet of overburden (Cobb, 1976 [OFR 76-576]). The heavy mineral concentrates include magnetite, ilmenite, and a trace of scheelite (Bundtzen and others, 1987). The gold is from 837 to 857 fine, and averages 833. Incomplete records from 1909 to 1941 indicate that 7,925 ounces of gold and 1,591 ounces of silver were produced from several small placer mines.
|Geologic map unit||(-156.533015028809, 62.9375862682645)|
|Mineral deposit model||Placer Au deposit (Cox and Singer, 1986; model 39a).|
|Mineral deposit model number||39a|
|Age of mineralization||Probably Pleistocene (Bundtzen, 1980 [GR 63]).|
|Workings or exploration||Placer deposits on Spaulding Creek were initially mined in open cuts using scrapers; then bulldozers and draglines were used. A dredge mined past the mouth of Spaulding Creek in the 1930s. Most of the mining in the creek was before World War II. Smith reported a non-dredge operation on Spaulding Creek in 1935 (Smith, 1937 [Bull 880-A]), also an operation in 1939 by Vibe and Schwaesdall (Smith, 1941 [Bull 926-A]).|
|Indication of production||Yes|
|Production notes||Incomplete records from 1909 to 1941 indicate that 7,925 ounces of gold and 1,591 ounces of silver were produced from several small placer mines (Bundtzen and Miller, 1997).|
Bundtzen, T.K., and Laird, G.M., 1982, Geologic map of the Iditarod D-2 and eastern D-3 quadrangles, Alaska: Alaska Division of Geological and Geophysical Surveys Geologic Report 72, 1 sheet, scale 1:63,360.
Bundtzen, T.K., and Miller, M.L., 1997, Precious metals associated with Late Cretaceous-early Tertiary igneous rocks of southwestern Alaska, in Goldfarb, R.J., and Miller, L.D., eds., Mineral Deposits of Alaska: Economic Geology Monograph 9, p. 242-286.
Bundtzen, T.K., Green, C.B., Deagen, J.R., and Daniels, C.L., 1987, Alaska's mineral industry, 1986: Alaska Division of Geological and Geophysical Surveys Special Report 40, 68 p.
Cobb, E.H., 1972, Metallic mineral resources map of the Iditarod quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-363, 1 sheet, scale 1:250,000.
Cobb, E.H., 1976, Summary of references to mineral occurrences (other than mineral fuels and construction material) in the Iditarod and Ophir quadrangles, Alaska: U.S. Geological Survey Open-File Report 76-576, 101 p.
Miller, M.L., Bundtzen, T.K., and Gray, J.E., 2005, Mineral resource assessment of the Iditarod quadrangle, west-central Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-2219-B, scale 1:250,000, pamphlet.
Smith, P.S., 1937, Mineral industry of Alaska in 1935: U.S. Geological Survey Bulletin 880-A, p. 1-95.
|Reporters||T.K. Bundtzen (Pacific Rim Geological Consulting, Inc.), M.L. Miller (U.S. Geological Survey); and C.C. Hawley (Hawley Resource Group)|
|Last report date||5/12/2003|