|Quadrangle map, 1:250,000-scale||WI|
|Quadrangle map, 1:63,360-scale||B-1|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||This site consists of several occurrences near the top of Smith Creek Dome. The coordinates are the top of the Dome which is about 0.6 mile south-southwest of the center of section 26, T. 31 N., R. 12 W. The location is accurate.|
The rocks at the top of Smith Creek Dome are Upper Devonian quartzite interbedded with chloritic quartzite and quartz-mica schist . They are thrust faulted over Devonian schist and phyllite (Eden, 2000; Kurtak and others, 2002).
Several parties have described mineralization near the top of Smith Creek Dome. Ebbley and Wright (1948) described a 6-inch-thick quartz-stibnite vein at a caved prospect. Brosge and Reiser (1972) collected several samples in the same area, possibly at the same prospect. Two samples of a quartz-stibnite vein assayed up to 9.2 parts per million (ppm) gold, 5,000 ppm arsenic, and more than 1 percent antimony. Elen (2000) also collected several samples in this vicinity. One was of a quartz vein that cut quartz-mica schist and contained 46 parts per billion (ppb) gold. A sample of schist with pyrite cubes contained 2,234 ppb gold, 7.2 ppm silver and 3,500 ppm lead.Kurtak and others (2002) located 2 trenches, half a mile north of Smith Creek Dome, perhaps the same prospect described by Ebbley and Wright. The larger is 6 feet long, 3 feet wide and 3.5 feet deep. A select sample of quartz-stibnite vein in this trench contained 436 ppb gold, 297 ppm arsenic, and 28.1 percent antimony. They also collected 8 samples of quartz veins and wallrock just south of the top of Smith Creek Dome. Seven of of the 8 samples contained 9 to 5,095 ppb gold. The quartz veinlets are about 1/8th to 1 inch wide, strike about N55W, and dip 83S. The veins are exposed for no more than 10 feet along strike. They average 3,665 ppb gold, 5.1 ppm silver, 2,931 ppm lead, 103 ppm arsenic, and 126 ppm antimony.
|Geologic map unit||(-150.174949126057, 67.476074632937)|
|Mineral deposit model||Quartz -stibnite vein and low-sulfide gold-quartz vein (Cox and Singer, 1986; models 27d and 36a).|
|Mineral deposit model number||27d, 36a|
|Age of mineralization||Devonian or younger based on the age of the host rocks.|
|Alteration of deposit||No mention of alteration.|
|Workings or exploration||Four episodes of examination and sampling by government agencies from 1948 to about 2000.|
|Indication of production||None|
Ebbley, Norman, Jr., and Wright, W.S., 1948, Antimony deposits in Alaska: U.S. Bureau of Mines Report of Investigations 4173, 41 p.
Eden, K., 2000, Geology and gold mineralization of the Nolan area in the Brooks Range, Alaska: U.S. Bureau of Land Management Open-File Report 78, 87 p.
Kurtak, J.M., Klieforth, R.F., Clark, J.M., and Maclean, E.A., 2002, Mineral investigations in the Koyukuk mining district, northern Alaska: Final Report: U.S. Bureau of Land Management Technical Report 50, v. 1 and 2, 845 p.
|Reporters||J.M. Britton (Anchorage); D.J. Grybeck (Contractor, USGS)|
|Last report date||2/1/2011|