York Creek (West)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Sn; W
Ore minerals powellite; scheelite

Geographic location

Quadrangle map, 1:250,000-scale TE
Quadrangle map, 1:63,360-scale C-5
Latitude 65.568
Longitude -167.108
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 setting

Geologic description

The 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

Production and reserves

Workings or exploration Three USBM churn-drill holes have been completed here (Mulligan, 1959, p. 6, 15, and 16).
Indication of production None

References