|Quadrangle map, 1:250,000-scale||NM|
|Quadrangle map, 1:63,360-scale||C-1|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||This partly residual, alluvial placer gold mine is in Pioneer Gulch, a small west tributary to upper Snake River on the east side of hill 1276. The map site is in the NW1/4 section 23, T. 9 S., R. 34 W., Kateel River Meridian. It includes localities 35 and 90 of Cobb (1972 [MF 463], 1978 [OFR 78-93]) and locality 14 of Hummel (1962 [MF 247]).|
Geologic descriptionA partly residual alluvial gold placer was mined in Pioneer Gulch as early as 1903 (Collier and others, 1908). Its discovery must have occurred early in the history of the Nome District because a 4.5 mile-long ditch had been constructed from Last Chance Creek to Pioneer Gulch by September of 1903 (Collier and others, 1908, p. 183). The placer gold was coarse and angular, and some had attached quartz fragments (Moffit, 1913). Prospecting for lode deposits, including at least one shaft, identified narrow limonitic calcite-quartz veins containing pyrite, arsenopyrite, and free gold (Cathcart, 1922). Gold-bearing quartz veins were exposed on the property in 1992. The veins cut graphitic schist that probably has an early Paleozoic protolith age (Hummel, 1962 [MF 247]; Sainsbury, Hummel, and Hudson, 1972 [OFR 72-326]; Till and Dumoulin, 1994; Bundtzen and others, 1994).
|Geologic map unit||(-165.42291560044, 64.6945365177566)|
|Mineral deposit model||Alluvial placer Au, in part residual, and low-sulfide Au-quartz veins (Cox and Singer, 1986; models 39a and 36a).|
|Mineral deposit model number||39a and 36a|
|Age of mineralization||Quaternary; veins are mid-Cretaceous or younger because they cut schist metamorphosed in the mid-Cretaceous.|
|Workings or exploration||Surface mining of alluvial placer deposits commenced in 1903, and a residual placer deposit was mined by 1913. Hard rock exploration, including at least one shaft, was reported by Cathcart (1922).|
|Indication of production||Yes; small|
|MRDS Number||A012819; A012878|
Bundtzen, T.K., Reger, R.D., Laird, G.M., Pinney, D.S., Clautice, K.H., Liss, S.A., and Cruse, G.R., 1994, Progress report on the geology and mineral resources of the Nome mining district: Alaska Division of Geological and Geophysical Surveys, Public Data-File 94-39, 21 p., 2 sheets, scale 1:63,360.
Cathcart, S.H., 1920, Mining in northwestern Alaska: U.S. Geological Survey Bulletin 712-G, p. 185-198.
Cobb, E.H., 1972, Metallic mineral resources map of the Nome quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-463, 2 sheets, scale 1:250,000.
Cobb, E.H., 1978, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Nome quadrangle, Alaska: U.S. Geological Survey Open-File report 78-93, 213 p.
Collier, A.J., Hess, F.L., Smith, P.S., and Brooks, A.H., 1908, The gold placers of parts of Seward Peninsula, Alaska, including the Nome, Council, Kougarok, Port Clarence, and Goodhope precincts: U.S. Geological Survey Bulletin 328, 343 p.
Hummel, C.L., 1962, Preliminary geologic map of the Nome C-1 quadrangle, Seward Peninsula, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-247, 1 sheet, scale 1:63,360.
Moffit, F.H., 1913, Geology of the Nome and Grand Central quadrangles, Alaska: U.S. Geological Survey Bulletin 533, 140 p.
Sainsbury, C.L., Hummel, C.L., and Hudson, Travis, 1972, Reconnaissance geologic map of the Nome quadrangle, Seward Peninsula, Alaska: U.S. Geological Survey Open-File Report 72-326, 28 p., 1 sheet, scale 1:250,000.
Till, A.B., and Dumoulin, J.A, 1994, Geology of Seward Peninsula and St. Lawrence Island, in Plafker, G., and Berg, H.C., eds., The Geology of Alaska: Geological Society of America, DNAG, The Geology of North America, v. G-1, p. 141-152.
|Reporters||C.C. Hawley and Travis L. Hudson|
|Last report date||7/10/2000|