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 Articles
Minerals by PropertiesMinerals by ChemistryAdvanced Locality SearchRandom MineralRandom LocalitySearch by minIDLocalities Near MeSearch ArticlesSearch GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportCoordinate Completion ReportAdd Glossary Item
Mining CompaniesStatisticsThe ElementsUsersBooks & MagazinesMineral MuseumsMineral Shows & EventsThe Mindat DirectoryDevice Settings
Photo SearchPhoto GalleriesNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day Gallery

Pioneer Mine (Great Republic Mine; Old Pioneer; White Metal; White Metal Mining Co. claims; Great Republic patent MS 370; Devine property; Pioneer South patent MS 374), Pioneer Mountain, Pinal Mountains District, Pinal Mts, Gila Co., Arizona, USA

This page is currently not sponsored. Click here to sponsor this page.
A former surface and underground Ag-Pb-Au-Cu-Zn mine, located in the NE¼NW¼ sec. 29, T2S, R15E, 1 mile SW of Pioneer Mountain, South slope of the Pinal Mountains, on private land. Produced 1875-1969. Operated by White Metal Mining Co. (1969). Additional names which apply to this proeprty: Howard shaft.

Mineralization is a vein deposit hosted in the Dripping Springs Quartzite, diabase and shale. The ore zone strikes N30E to N50E, and dips vertically to 75W. There are three major NE-striking veins, 1 to 3 meters wide; 8 to 10 feet wide in the open cuts, low grade. Ore control was fissures along and near NE-trending faults. An associated rock unit is rhyolite.

Area structures include two parallel NE-trending faults. Dripping Springs Quartzite is in fault contact with diabase to the south. The fault strikes NW. Dripping Springs Quartzite strikes E-W and dips 20°-25°S. Barnes Conglomerate is present both at the Dripping Springs-diabase contact, and at Dripping Springs-Pioneer Shale contact, which strikes NW. The Dripping Springs Quartzite is 100 meters wide at the mine. Late Cretaceous-Tertiary rhyolite outcrops 1/8 mile NE of the mine, in contact with Pioneer Shale, rhyolite of this age is common in the area in both Pioneer Shale and Ruin Granite.

Workings include 700 feet of stoping on the 200 and 300 foot levels of the 450 foot deep shaft. There is also a 350 foot shaft on the Howard vein, where 750 feet of stoping is present on the 200 foot level. Open cuts are also present. Workings total 1219.2 meters in length and 137.16 meters deep. The White Metal Mining Company was the main producer in the 1920's. Clippings report that high grade ore was produced in 1884.

Mineral List

5 entries listed. 5 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.


The Resources of Arizona - A Manual of Reliable Information Concerning the Territory, compiled by Patrick Hamilton (1881), Scottsdale, AZ: 65.

Arizona Mining Journal (1919) November, 1919: 48.

Weed, W.H. (1922) The Mines Handbook, Vol. XV: 434.

Rand, L.H. & Sturgis, E.B. (1931) The Mines Handbook, Vol. XVIII: 467.

USGS Geologic Quadrangle GQ-1442 (1978).

U.S. Bureau of Mines - Arizona Bureau of Geology and Mining Technology file data.

U.S. Bureau of Land Management Mining District Sheet 672.

Arizona Department of Mineral Resources Pioneer Mine file.

Arizona Department of Mineral Resources U file Ag 6.

USGS El Capitan Mountain Quadrangle map.

Yale Peabody GNIS database (NOTE: this database is derived from USGS 1:24,000 topographic map data).

MRDS database Dep. ID #10046323, MRDS ID #M241231; and Dep. ID #10161003, MAS ID #0040070549.

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: July 23, 2019 01:41:18 Page generated: January 11, 2015 08:51:54
Go to top of page