SUPPORT US. If mindat.org is important to you, click here to donate to our Fall 2019 fundraiser!
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 EducatorsMindat ArticlesThe ElementsBooks & Magazines
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
Mining CompaniesStatisticsUsersMineral MuseumsMineral Shows & EventsThe Mindat DirectoryDevice Settings
Photo SearchPhoto GalleriesNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day GalleryMineral Photography

Yankee Mine, Tintic District, Utah Co., Utah, USA

This page is currently not sponsored. Click here to sponsor this page.
 
 
Location and Description

The Yankee mine is located on the eastern slopes of Godiva Mountain, and is at an elevation of 7,010 feet. The mine is opened up by a main shaft that is 2,000 feet deep, and a tunnel that connects to the rest of the workings by an inclined winze that goes down to the 600 foot level, with the winze being 500 feet deep, and the stoping in the winze does not extend down past the 600 foot level. Prospect drifts from the main shaft extend from the 600, 900, 1300, 1400, 1700, 1900, and 2000 foot levels. The shaft also passes through 300 feet of rhyolite from the surface. The larger stopes in the mine are near the surface and connect with the Humbug claim to the south. The upper stopes yielded 28-30 ounces of silver, with a maximum of 50 ounces of silver a ton, and were composed of 25-30% lead. The lower yielding ore carried 10 ounces of silver and were 10-15% lead. The ore from the mine was hauled by wagon to the Denver and Rio Grande Railroad at Summitt Station.

Geology

The country rock includes the Packard Rhyolite, the limestone of the Humbug Formation, and the dense cherry Pine Canyon Limestone. The Rhyolite is strongly impregnated with pyrite, and where exposed underground, is coated with feathery crystals of jarosite. Fissures trending N15E open or widen into small caves.

Workings and Ore

On the 300 foot level and 300 feet SW of the shaft, a cave about 100 feet long and 20 feet high was discovered. On the 930 foot level, the shaft intersects another large cave that is partly filled with waste rock, it was said to have been 75 feet deep before it was partially filled with the waste rock. The deep shaft workings discovered the northward continuation of the Iron Blossom ore channel. Prospecting done on the 400, 500, and 600 foot levels discovered quartz veins, but no commercially valuable ore was found. A south drift on the 600 foot level follows a fissure of quartz and limonite. The fissure is vertical for some distance, then flattens to a dip of 45°, which the drift then follows upwards to the 550 foot level, then it resumes being vertical and trending southwards. On the east end of the 500 foot level a narrow quartz vein 2-3 inches wide follows a porphyry-dike contact. This same vein carries a little gold and silver, but no Lead. About 200 feet south of the vertical shaft a drift follows a N-S trending fissure, which carries black quartz, pyrite, copper stain, and traces of lead. Assays for the vein ran 40-60 cents in gold, and an ounce, to an ounce and a half of silver per ton. What is probably the same fissure, is also found on the 400 foot level, 200 feet west of the shaft. Here it dips 60NE and has been followed upward for 100 feet. On the same drift, but only 100 feet west of the shaft, it follows a narrow dark quartz vein, that has been re-cemented by white milky quartz. The vein has been followed for 500 feet in a northerly direction, stopping against the soft and decomposed Porphyry contact. The vein assayed at $1 in gold, and 1 ounce of silver to the ton, with no Lead. On the east wall of the cave on the 400 foot level, another similar brecciated Quartz vein was encountered. On the 1900 foot level, a mineralized quartz zone was encountered, yielding low assays of lead, silver, copper, and gold, with Iron and Manganese. Similar material, but without the Copper, was found on the 1800 foot level. A prospect drift on the 2000 foot level, headed in the direction of the ground under the gulch east of the shaft, cutting "The Great Eastern Vein", has exposed a vein of quartz, baryte, and calcite with iron and manganese oxides, with small amounts of lead, silver, gold, and copper. Assays showed an average of 8 ounces of silver, and 80 cents in gold per ton, and was occasionally as high as 112 ounces of Silver, and $18 in Gold per ton. These local rich spots have prominent stains of azurite and malachite, but the overall copper content was fairly low, being only around 0.5%. The vein averaged from a small streak, to being 4 feet in width, and it followed an E-W break.

Mineral List



10 entries listed. 10 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

Lindgren, Waldemar and G. F. Loughlin (1919), Geology and Ore Deposits of the Tintic Mining District, Utah by with a historical review by V. Conrad Heikes, USGS Professional Paper 107: 226-230.

UGMS Bulletin 117, Minerals and Mineral Localities of Utah.

 
Mineral and/or Locality  
Mindat.org is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization. Public Relations by Blytheweigh.
Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2019, except where stated. Most political location boundaries are © OpenStreetMap contributors. Mindat.org relies on the contributions of thousands of members and supporters.
Privacy Policy - Terms & Conditions - Contact Us Current server date and time: November 21, 2019 01:45:35 Page generated: March 30, 2015 18:07:55
Go to top of page