Wyrick Prospect, Iditarod District, Yukon-Koyukuk Borough, Alaska, USA
This page is currently not sponsored. Click here to sponsor this page.
Geology: The Wyrick prospect consists of quartz-stibnite gash veins that cut shale and sandstone of the Upper Cretaceous, Kuskokwim Group and an Upper Cretaceous granite-porphyry dike (Bundtzen, Miller, and Laird, 1986; Miller and Bundtzen, 1994). Five individual gash veins of quartz that contain stibnite, pyrite, and the secondary antimony minerals kermesite and stibiconite are found in shear zones and along the sides of the granite-porphyry dikes. The veins strike N85E and dip steeply to vertically. Most of the veins are from 1 to 12 inches thick but one mineralized shear zone is about 20 feet thick. This zone can be traced along strike for about 65 feet where is covered by soil and vegetation. Stibnite occurs as radiating crystals up to 3 inches long and an inch wide. Chip-channel samples of the mineralized zone contained from 0.55 to 30.9 percent antimony, up to 700 parts per billion (ppb) gold, and 4,000 ppb silver. Detailed sampling indicates that the large shear zone contains 2.4 to 3.1 tons of antimony per vertical foot (Bundtzen, Miller, and Laird, 1986).
Workings: The Wyrick Lode was discovered in 1984 when L.E. Wyrick was digging a bedrock drain for his placer mine. Another bedrock drain about 50 feet east exposed an extension of the mineralization. Battle Mountain Mining Company explored the property in the late 1980s, and drilled one diamond core hole (Szumigala, 1993). Results of that investigation are confidential. Paul Glavinovich and William Morgan completed an investigation of the Wyrick prospect and surrounding area in 1994 (Glavinovich and Morgan, 1994). From 1996-1997, Placer Dome Exploration flew an aeromagnetic survey over the Upper Granite Creek area, including the Wyrick Lode area. Results of that survey have not been publicly released (L.E. Wyrick, oral communication, 2003).
Age: Unknown; a nearby intrusion has a 40K/40Ar age of 71.1 Ma (Miller and Bundtzen, 1994).
Alteration: Yellow-brown unidentified clay alteration.
Reserves: Detailed sampling indicates that the large shear zone contains 2.4 to 3.1 tons of antimony per vertical foot (Bundtzen, Miller, and Laird, 1986).
Commodities (Major) - Au, Sb; (Minor) - Ag, Hg, Pb
Development Status: None
Deposit Model: Simple Sb veins (Cox and Singer, 1986; model 27d).
5 entries listed. 4 valid minerals.
The above list contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.
Bundtzen, T.K., Cox, B.C., and Veach, N.C., 1987, Heavy mineral provenance studies in the Iditarod and Innoko districts, western Alaska: Process Mineralogy VII, The Metallurgical Society, p. 221-246. Bundtzen, T.K., Miller, M.L., and Laird, G.M., 1986, Prospect examination of the Wyrick placer/lode system, Granite Creek, Iditarod-George mining district, Iditarod B-2 quadrangle, Alaska: Alaska Division of Geological and Geophysical Surveys Public Data File Report 86-29, 10 p., 1 sheet, scale 1:200. Miller, M.L., and Bundtzen, T.K., 1994, Generalized geologic map of the Iditarod quadrangle, Alaska showing potassium-argon, major oxide, trace element, fossil, paleocurrent, and archeological sample localities: U.S. Geological Survey Miscellaneous Field Studies Map MF-2219-A, 48 pages; 1 sheet, scale 1:250,000. Miller, M.L., Bundtzen, T.K., and Gray, J.E., 2005, Mineral resource assessment of the Iditarod quadrangle, west-central Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-2219-B, scale 1:250,000, pamphlet.