|Quadrangle map, 1:250,000-scale||GO|
|Quadrangle map, 1:63,360-scale||B-2|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||This occurrence is between the Togiak River and Ongivinuck River basins, about 8 km south of Togiak Lake. It is area 6 of Kilburn and others (1992) and is approximately located, perhaps within 1 or 2 miles. For this record, the map site is at an elevation of about 1,350 feet at the head of an unnamed creek, in the NW1/4 of section 34, T 8 S, R 61 W, of the Seward Meridian.|
Geologic descriptionThis occurrence is assumed to be within a Cretaceous or Tertiary granitic stock and surrounding hornfels that underlie this area (Hoare and Coonrad, 1978). Samples of diorite and hornfels contain up to greater than 10 ppm Hg (Coonrad and others, 1978). Quartz veinlets that occur within and parallel to an altered mafic dike that cuts diorite contain up to 0.23 ppm Ag, 0.25 ppm Au, 1.4 ppm Hg, and 60 ppm Sb (Kilburn and others, 1992); the host mafic dike contains 13.4 ppm Hg.
|Geologic map unit||(-159.642214616346, 59.4492457190622)|
|Mineral deposit model||Epithermal mercury|
|Age of mineralization||Probably Late Cretaceous or Early Tertiary. Mineralization may be related to the granitic pluton in the area, which is inferred to be part of a regionally extensive Upper Cretaceous and Lower Tertiary plutonic suite (Hoare and Coonrad, 1978).|
|Alteration of deposit||Silicification and oxidation.|
|Workings or exploration||Reconnaissance geochemical rock sampling has been completed in the area.|
|Indication of production||None|
Coonrad, W.L., Hoare, J.M., Taufen, P.M., and Hessin, T.D., 1978, Geochemical analyses of rock samples in the Goodnews and Hagemeister Island quadrangles region, southwestern Alaska: U.S. Geological Survey Open-File Report 78-9-H, 1 sheet, scale 1:250,000.
Hoare, J.M., and Coonrad, W.L., 1978, Geologic map of the Goodnews and Hagemeister Island quadrangles region, southwestern Alaska: U.S. Geological Survey Open-File Report 78-9-B, 2 sheets, scale 1:250,000.
Kilburn, J., Box, S.E., Goldfarb, R.J., and Gray, J.E., 1992, Geochemically anomalous areas in the eastern Goodnews Bay 1 degre x 3 degree quadrangle, southwest Alaska, in Bradley, D.C., and Ford, A.B., eds., Geologic studies by the U.S. Geological Survey in 1990: U.S. Geological Survey Bulletin 1999, p. 156-162.
|Reporters||Travis L. Hudson|
|Last report date||3/20/2001|