|Quadrangle map, 1:250,000-scale||NM|
|Quadrangle map, 1:63,360-scale||C-2|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||Boulder Creek is a west tributary to Snake River; it flows east from headwaters in the eastern Nome C-2 quadrangle. An alluvial placer gold deposit was worked downstream from the Boulder Creek lode prospect (NM165) over a distance of about a mile. The location is the approximate mid-point of the placer mine and just below the junction of Boulder and Twin Mountain Creeks (Twin Mtn Ck on the map); it is accurate to within about 500 feet. Mining claims on this part of Boulder Creek are patented. This is locality 94 of Cobb (1972, MF-463; 1978, OFR 78-93).|
Geologic descriptionAn alluvial placer gold deposit was worked downstream from the Boulder Creek lode prospect (NM165) over a distance of about a mile. The locality was known shortly after the discovery of the Nome district (Collier and others, 1908, p. 196), and mining claims along the creek are patented. The pay streak varied from about 100 to 300 feet in width and was from 10 to 25 feet deep. Concentrates from Boulder Creek contained native bismuth, stibnite, hematite, ilmenite and magnetite. Scheelite occurred in the concentrates below Twin Mountain Creek (Coats, 1944). The apparent head of the pay streak is the Boulder Creek lode prospect (NM165). The Boulder Creek lode is apparently developed on subsidiary structures to the Rodine fault, a major north-northeast fault of the Nome district (Bundtzen and others, 1994). Some of the placer gold in Boulder Creek is almost certainly derived from the fault and associated mineralized structures. Lower Boulder Creek flows over mica-schist and marble bedrock; some of the marble is strongly altered to ankerite.
|Geologic map unit||(-165.509908008458, 64.6465327325704)|
|Mineral deposit model||Alluvial placer Au (Cox and Singer, 1986; model 39a).|
|Mineral deposit model number||39a|
|Age of mineralization||Quaternary.|
|Alteration of deposit||Marble is altered to ankerite.|
|Workings or exploration||Boulder Creek was worked from about 1900 until as late as 1924 (Smith, 1924). It probably had a moderate amount of production. Collier and others (1908) reported that the gold was coarse but that miners in 1903 were making little more than wages. Placer mine activity was also reported in 1913 (Chapin, 1914, [B 592-L, p. 389]), 1914 (Eakin, 1915 [B 622-I, p. 370), 1916 (Mertie, 1918 [ B 662-I, p. 455]), and 1918 (Cathcart, 1920, p. 188). The miners apparently used an elevated sluice fed by a hydraulic elevator.|
|Indication of production||Yes; medium|
|MRDS Number||AO12892; D002584|
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.
Chapin, Theodore, 1914, Placer mining on Seward Peninsula: U.S. Geological Survey Bulletin 592-L, p. 385-395.
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.
Eakin, H.M., 1915, Placer mining in Seward Peninsula: U.S. Geological Survey Bulletin 622-I, p. 366-373.
Mertie, J.B., Jr., 1918, Placer mining on Seward Peninsula in Brooks, A.H., and others, Mineral resources of Alaska, report on progress of investigations in 1916: U.S. Geological Survey Bulletin 662, p. 451-458.
|Reporters||C.C. Hawley and Travis L. Hudson|
|Last report date||3/12/2000|