IMPORTANT MESSAGE. We need your support now to keep running. Click here to find out why.
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:
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

Toughnut Mine (Tough Nut Mine; Northwest Mine; Hoodoo stopes; Tombstone group), Tombstone, Tombstone District, Tombstone Hills, Cochise Co., Arizona, USA

This page is currently not sponsored. Click here to sponsor this page.
Lock Map
Latitude & Longitude (WGS84): 31° 42' 44'' North , 110° 4' 0'' West
Latitude & Longitude (decimal): 31.71250,-110.06667
GeoHash:G#: 9t9srm5fs
Other regions containing this locality:Sonoran Desert, North America
Locality type:Mine
Köppen climate type:BSk : Cold semi-arid (steppe) climate

A former small underground Pb-Ag-Zn-Cu-Au-V-(Cd) mine located in the center of sec. 11 and 14, T.20S., R.22E, ¼ mile south of Tombstone, on private land. Discovered by A.E. Sheiffelin in February 1878. One of Tombstone's first mines, included in the Tombstone group, adjoins the Empire shaft. Owned at times, or in part, by the Tombstone Mill & Mining Co., Tombstone Consolidated Mines Co., Bunker Hill mines Co., and the Tombstone Development Co.

Mineralization is a replacement deposit oxidized base metal sulfides in replacement orebodies in the lower section of the Cretaceous Bisbee Group beds along anticlinal rolls and in pipes where rolls are cut by 'northeast' fissures.

Local structures include the Tombstone Basin; N-trending dikes and NE fissures.

Workings include shafts, drifts, winzes and open cuts. Workings length is 1,219.2 meters in overall area 304.8 meters long, 228.6 meters wide and 152.4 meters deep, including the Empire and adjoining shaft. Several thousand tons of ore were produced in the late 1800's and early 1900's. After 1883 production was included under the Goodenough and the Tombstone group in ABGMT-USBM file data.

Mineral List

46 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

66 - 145 Ma

ID: 3187054
Mesozoic sedimentary rocks

Age: Cretaceous (66 - 145 Ma)

Lithology: Sedimentary rocks

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Campanian - Oxfordian
72.1 - 163.5 Ma

ID: 2946362
Cretaceous to Late Jurassic sedimentary rocks with minor volcanic rocks

Age: Mesozoic (72.1 - 163.5 Ma)

Stratigraphic Name: Temporal Formation; Bathtub Formation; Sand Wells Formation; Fort Crittenden Formation; McCoy Mountains Formation

Description: Sandstone and conglomerate, rarely forms prominent outcrops; massive conglomerate is typical near base of unit and locally in upper part. These deposits are nonmarine except in southeastern Arizona, where prominent gray marine limestone (Mural Limestone) forms the middle of the Bisbee Group. Sandstones are typically medium-bedded, drab brown, lithic-feldspathic arenites. Includes Bisbee Group (largely Early Cretaceous) and related rocks, Temporal, Bathtub, and Sand Wells formations, rocks of Gu Achi, McCoy Mountains Formation, and Upper Cretaceous Fort Crittenden Formation and equivalent rocks. (80-160 Ma)

Lithology: Major:{arenite,conglomerate}, Minor:{limestone}

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.


Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Hamilton, Patrick (1881) The Resources of Arizona - A Manual of Reliable Information Concerning the Territory: 35. Prescott, AZ.
Blake, W.P. (1882) The geology and veins of Tombstone, Arizona. Transactions of the American Institute of Mining Engineers: 10: 336, 342-344.
Church, J.A. (1903) The Tombstone, Arizona, mining district. Transactions of the American Institute of Mining Engineers: 33: 6, 9, 14-17, 21-22, 24, 25-26.
Guild, F.N. (1911) Mineralogische Notizen. Zeitschrift für Krystallografie und Mineralogie: 49: 321-331.
Guild, F.N. (1917) A microscopic study of the silver ores and their associated minerals. Economic Geology: 12: 297-353.
Rasor, C.A. (1938) Bromyrite from Tombstone, Arizona. American Mineralogist: 23: 157-159.
Rasor, C.A. (1939) Manganese mineralization at Tombstone, Arizona. Economic Geologist: 34: 790-803.
Butler, B.S. et al. (1938) Geology and ore deposits of the Tombstone district, Arizona. Arizona Bureau of Mines Bulletin 143: 41, 44, 51, 89, 92-93, Pl. III, IV.
Frondel, C. and Pough, F.H. (1944) Two new tellurites of iron: Mackayite and blakeite, with new data on emmonsite and durdenite. American Mineralogist: 29: 211-225.
Galbraith, F.W. (1947) Minerals of Arizona. Arizona Bureau of Mines Bulletin 153: 16, 27, 30.
Romslo, T.M. and Ravitz, S.F. (1947) Arizona manganese-silver ores. U.S. Bureau of Mines Report of Investigation 4097.
Gilluly, James (1956) General geology of central Cochise County, Arizona, with sections on age and correlation, by A.R. Palmer, J.S. Williamson, and J.B. Reeside, Jr. U.S. Geological Survey Professional Paper 281, 169 p., 13 sheets, scale 1:62,500.
Galbraith, F.W. and Brennan, D.J. (1959) Minerals of Arizona: 48, 53, 64, 65, 70, 92, 101.
Bideaux, R.A. et al. (1960) Some new occurrences of minerals of Arizona. Arizona Geological Society Digest: 3: 53-56.
McLean, W.J. and Anthony, J.W. (1972) The disordered ‘zeolite-like’ structure of connellite. American Mineralogist: 57: 426-438.
Keith, Stanton B. (1973) Index of Mining Properties in Cochise County, Arizona. Arizona Bureau of Mines Bulletin 187: 79 (Table 4).
Anthony, J.W. et al. (1995) Mineralogy of Arizona, 3rd. ed.: 125, 131, 146, 157, 183, 196, 200, 211, 212, 219, 247, 261, 265, 281, 304, 306, 332, 357, 361, 374, 385, 392, 401.
Arizona Bureau of Mines files.
MRDS database Dep. ID file #10039570, MRDS ID #M050351; and, Dep. ID #10258769, MAS ID #0040030692.

Mineral and/or Locality is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization.
Copyright © and the Hudson Institute of Mineralogy 1993-2018, except where stated. relies on the contributions of thousands of members and supporters.
Privacy Policy - Terms & Conditions - Contact Us Current server date and time: October 17, 2018 06:30:24 Page generated: June 27, 2018 00:56:15
Go to top of page