|Quadrangle map, 1:250,000-scale||TE|
|Quadrangle map, 1:63,360-scale||C-5|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||York Creek is a north-flowing tributary to the Pinguk River. It heads on the continental divide and the north flank of Brooks Mountain, the highest part (2,898 feet elevation) of the York Mountains. Some of the headwater areas are in the contact zone of the Brooks Mountain granite stock. This location is on the west headwater fork of York Creek at an elevation of 510 feet. It is locality 47 of Cobb and Sainsbury (1972) and Cobb (1975) summarized relevant references under the name 'York Cr.'.|
Geologic descriptionThe headwater area of York Creek, on the north flank of the Brooks Mountain area, includes the contact zone of the Brooks Mountain granite stock and a small granite plug in Ordovician limestone (Sainsbury, 1969, plate 1). Fine-grained, carbonaceous metapelitic rocks of uncertain but probable Paleozoic age are also present in this area and thermally metamorphosed near granite intrusions. Three USBM churn-drill holes were completed at this locality (Mulligan, 1959, p. 6). The 7.5 to 12 feet of gravel overlying shale and limy shale bedrock contain a trace of tin per cubic yard. Minerals identified in the heavy mineral concentrate included pyrite, limonite pseudomorphs after pyrite, garnet, barite, tourmaline, scheelite, and powellite (Mulligan, 1959, p. 16).
|Geologic map unit||(-167.110737497986, 65.567233300141)|
|Mineral deposit model||Alluvial tin placer (Cox and Singer, 1986; model 39e)|
|Mineral deposit model number||39e|
|Age of mineralization||Quaternary|
|Workings or exploration||Three USBM churn-drill holes have been completed here (Mulligan, 1959, p. 6, 15, and 16).|
|Indication of production||None|
Cobb, E.H., 1975, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Teller quadrangle, Alaska: U.S. Geological Survey Open-File Report 75-587, 130 p.
Cobb, E.H., and Sainsbury, C.L., 1972, Metallic mineral resources map of the Teller quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-426, 1 sheet, scale 1:250,000.
Mulligan, J.J., 1959, Sampling stream gravels for tin, near York, Seward Peninsula, Alaska: U.S. Bureau of Mines Report of Investigations 5520, 25 p.
|Reporters||Travis L. Hudson (Applied Geology)|
|Last report date||5/10/1998|