SUPPORT US. If 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:
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

Big Mine, Owl Head Buttes area, Owl Head District, Tortolita Mts, Pinal Co., Arizona, USA

This page is currently not sponsored. Click here to sponsor this page.
Latitude & Longitude (WGS84): 32° 37' 27'' North , 111° 4' 3'' West
Latitude & Longitude (decimal): 32.62417,-111.06750
Other regions containing this locality:Sonoran Desert, North America

A former surface and underground Ba-Cu-Pb-Ag mine located in sec. 26, T9S, R12E, about 3 miles ENE of Owl Head Buttes, on private land.

Mineralization is a vein deposit hosted in the Pinal Schist. Veins are 1 to 2 cm distributed sparsely over a 500 foot width. The ore zone strikes N30-60W, dips 45-80W, at 152.4 meters wide and 2133.6 meters long. Gossan is seen on the outcrop. One prospect pit is salted with Laramide porphyry. Mineralization is largely baryte along a fault with some copper oxide and occasional galena. Veins are crosscut by faults. Alteration is propylitic, sericitic with oxidized veins, illite. Related structure is a fault trending N35W, dipping 65S.

Workings include a major shaft deeper than 675 feet; a minor shaft approximately 610 feet; an adit with raises to the surface; and 10-15 prospect pits. No production data is available. A likely producer.

Mineral List

5 valid minerals.

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on

Tortonian - Rupelian
7.246 - 33.9 Ma
Middle Miocene to Oligocene volcanic and sedimentary rocks, undivided

Age: Cenozoic (7.246 - 33.9 Ma)

Description: Sequences of diverse volcanic rocks with abundant interbedded sedimentary rocks. (11-32 Ma)

Lithology: Major:{volcanic,clastic}

Reference: Horton, J.D., C.A. San Juan, and D.B. Stoeser. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States. doi: 10.3133/ds1052. U.S. Geological Survey Data Series 1052. [133]

Data and map coding provided by, used under Creative Commons Attribution 4.0 License

This page contains all mineral locality references listed on 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 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.


Barter, C.F. (1962) Geology of Owl Head Mining District, MS thesis, University of Arizona.

Banks, N.G. (1976) Field Exam.

Moore, R.T. & R.J. Varga (1976), Maps showing nonmetallic mineral deposits in the Phoenix area, Arizona: USGS Misc. Investigations map I-845-J, 1:250,000.

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

MRDS database Dep. ID #10039657; RDS ID #M050594.

Mineral and/or Locality is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization. Public Relations by Blytheweigh.
Copyright © and the Hudson Institute of Mineralogy 1993-2019, except where stated. Most political location boundaries are © OpenStreetMap contributors. relies on the contributions of thousands of members and supporters.
Privacy Policy - Terms & Conditions - Contact Us Current server date and time: October 14, 2019 07:05:22 Page generated: October 14, 2017 18:53:28
Go to top of page