Log InRegister
Home PageAbout MindatThe Mindat ManualHistory of MindatCopyright StatusWho We AreContact UsAdvertise on Mindat
Donate to MindatCorporate SponsorshipSponsor a PageSponsored PagesMindat AdvertisersAdvertise on Mindat
Learning CenterWhat is a mineral?The most common minerals on earthInformation for Educators
Minerals by PropertiesMinerals by ChemistryAdvanced Locality SearchRandom MineralRandom LocalitySearch by minIDLocalities Near MeSearch ArticlesSearch GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
Keyword(s):
 
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportCoordinate Completion ReportAdd Glossary Item
StatisticsThe ElementsUsersBooks & MagazinesMineral MuseumsMineral Shows & EventsThe Mindat DirectoryDevice Settings
Photo SearchPhoto GalleriesNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day Gallery

Michigan Creek Bench Mine, Iditarod District, Yukon-Koyukuk Borough, Alaska, USA

This page is currently not sponsored. Click here to sponsor this page.
 
 
Location: The Michigan Bench placer mine is near the mouth of a minor north-flowing tributary of Michigan Creek. The mine is about 1.3 mile west-northwest of the mouth of Michigan Creek at an elevation of about 500 feet. It is about 0.3 mile southeast of the center of section 24, T. 25 N., R. 44 W., of the Seward Meridian. The location is accurate.
Geology: The Michigan Bench is a small placer mine near the mouth of a small north-flowing, unnamed tributary of Michigan Creek. The deposit is on a terrace that probably represents an ancestral alluvial fan at the base of the small gulch that flows northeast at the mine. The gulch drains an area underlain by a swarm of granite porphyry and granodiorite dikes and sills exposed at the heads of Julian (ID177) and Spruce Creeks (ID176) (Miller and Bundtzen, 1994; Miller, Bundtzen, and Gray, 2005). In addition to gold, the principal heavy minerals in concentrate include cinnabar, garnet, and magnetite (Bundtzen, Cox, and Veach, 1987). The garnets are probably derived from garnetiferous granite-porphyry intrusions identified during geologic mapping southwest of the mine (Miller and Bundtzen, 1994). The Michigan Bench produced 125 ounces of gold during the early 1980s (Miller, Bundtzen, and Gray, 2005).
Workings: Placer gold was located on Michigan Creek in 1911 (Brooks, 1912). Samples were collected by the U.S. Geological Survey and Alaska Division of Geological and Geophysical Surveys in the 1980s (Bundtzen, Cox, and Veach, 1987).
Alteration: None.
Production: The Michigan Bench produced 125 ounces of gold during the early 1980s (Miller, Bundtzen, and Gray, 2005).

Commodities (Major) - Au; (Minor) - Ag, Hg
Development Status: Yes; small
Deposit Model: Placer Au deposit (Cox and Singer, 1986; model 39a).

Mineral List



4 entries listed. 3 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.

References

Brooks, A.H., 1912, The mining industry in 1911, in Brooks, A.H., and others, Mineral resources of Alaska, report on progress of investigations in 1911: U.S. Geological Survey Bulletin 520-A, p. 17-44. 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. 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.

Mineral and/or Locality  
Mindat.org is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization.
Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2018, except where stated. Mindat.org relies on the contributions of thousands of members and supporters.
Privacy Policy - Terms & Conditions - Contact Us Current server date and time: April 25, 2018 23:24:25 Page generated: January 16, 2015 00:28:23
Go to top of page