|Quadrangle map, 1:250,000-scale||SO|
|Quadrangle map, 1:63,360-scale||D-6|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||Iron Creek is a major south tributary to the upper Pilgrim River. The mouth of Iron Creek is about 11 miles downstream from the origin of the Pilgrim River on Salmon Lake. The 5.5-mile-long Iron Creek starts at the confluence of Canyon (SO115) and Dome (SO113) Creeks; the coordinates are at about the center of the mined length of the creek. Iron Creek is included in locality 33 of Cobb (1972, MF 445; 1978, OF 78-181).|
Geologic descriptionIron Creek has been placer mined over about 90 percent of its 5.5 mile length. Most of this mining was by small-scale methods from discovery in 1899 or 1900 to 1914. A dredge operated in 1939 and 1940 but this was probably upstream on Dome Creek (Sainsbury and others, 1972, OFR 512). Much of the placer on Iron Creek was of low tenor. The gold was bright and in both the active drainage and benches, particularly along the east side near Eagle (Easy) Creek (SO126). Mining along the lower part of the creek tried unsuccessfully to use sluices in a tunnel driven between Iron Creek and the Pilgrim River (Henshaw, 1910). The coarse gold and cinnabar recovered from the Iron Creek area appears to be from deposits upstream in the Iron Creek drainage (Smith, 1909). Bedrock in the area is mostly part of a lower Paleozoic metasedimentary assemblage (Till and others, 1986).
|Geologic map unit||(-164.684627610222, 64.9322551431586)|
|Mineral deposit model||Placer Au-PGE (Cox and Singer, 1986; model 39a).|
|Mineral deposit model number||39a|
|Age of mineralization||Quaternary; presence of gold-bearing bench deposits indicates two or more cycles of erosion and deposition.|
|Workings or exploration||Iron Creek has been placer mined over about 90 percent of its 5.5 mile length. Most of this mining was by small-scale methods from discovery in 1899 or 1900 to 1914. A dredge operated in 1939 and 1940 but this was probably upstream on Dome Creek (Sainsbury and others, 1972, OFR 512). Mining along the lower part of the creek tried unsuccessfully to use sluices in a tunnel driven between Iron Creek and the Pilgrim River. Water was lost to subsurface flow in areas of carbonate bedrock.|
|Indication of production||Yes; small|
|Production notes||The grade of the placer deposits was reported to be low but considerable mining and remining took place intermittantly from 1899 to 1940.|
|MRDS Number||A010714; A012673|
Cobb, E.H., 1972, Metallic mineral resources map of the Solomon quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-445, 1 sheet, scale 1:250,000.
Cobb, E.H., 1978, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Solomon quadrangle, Alaska: U.S. Geological Survey Open-File Report 78-181, 185 p.
Sainsbury, C.L., Hudson, T.L., Ewing, R., and Richards, T., 1972, Reconnaissance geologic map of the Solomon D-6 quadrangle, Seward Peninsula, Alaska: U.S. Geological Survey Open-File Report 72-325, 17 p.
Smith, P.S., 1909, Recent developments in southern Seward Peninsula: U.S. Geological Survey Bulletin 379-F, p. 267-301.
|Reporters||Travis L. Hudson (Applied Geology)|
|Last report date||8/19/1999|