|Latitude & Longitude (WGS84):||31° 42' 44'' North , 110° 4' 0'' West|
|Latitude & Longitude (decimal):||31.71250,-110.06667|
|Other regions containing this locality:||Sonoran Desert, North America|
|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.
46 valid minerals.
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 Macrostrat.org
66 - 145 Ma
|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. 
|Campanian - Oxfordian|
72.1 - 163.5 Ma
|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)
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.