Arizona · Cochise County
Past Producer

Keystone Mine

Cochise County, Arizona, United States
CopperZincMolybdenumLeadTungstenSilverGold
⌖ Show on mapUSGS source ↗
Commodities
PrimaryCopper, Zinc
SecondaryMolybdenum, Lead, Tungsten, Silver, Gold
Commodity typeM
Deposit
Deposit sizeS
WorkingsUnderground
Orebody formTABULAR, CHIMNEYS, MANTOS
Ore controlFavorable Beds Cut By Fault
Materials
Ore mineralsBornite, Chalcopyrite, Gold, Molybdenite, Pyrite, Scheelite, Silver, Sphalerite
GangueGarnet
Geology
Host rockShale,Limestone,Dolomite · Abrigo Formation; Martin Formation; Escabrosa Limestone
Associated rockQuartz Monzonite · Texas Canyon Quartz Monzonite
StructureNw Tert Block Faulting, Lcret Or Etert N & Nw Trending Folds And Thrust Faulting, N63e Normal Fault Dips 36se; Keystone Fault With A Horizontal Displacement Of About 1200 Ft
Tectonic settingBasin & Range
AlterationLimestone Is Metamorphosed To Tactite Characterized By Diopside, Tremolite, K-Feldspar, Quartz
Economic & production
Development statusPast Producer
First production1915
Last production1958
Discovery year1908
Identification
Deposit ID10039383
MRDS IDM050006
Alternate namesBannon Group Which Includes Claims: Mary, Calumet, Ultimo, Charles, Nevertheless, Ella, Gustave, Wolfrime, Louie, Ernest, Erika, Roswell, Hagerman, Dora, Ina, O.K., Gladys, Maher, Esmeralda, Halderman, Hagerman Mine, Ok Mine
RegionNA
Data scoreB
Coordinates32.0929, -110.05844
References
COOPER & SILVER, 1964, USGS PP 416.COOPER, 1950, ABM BULL 156.ROMSLO, 1949, USBM RI 4504.KEITH, 1973, ABM BULL 187.ABGMT CLIPPINGS FILE.LIVINGSTON ET AL, 1967, JGR, V. 72, P. 1361-1375.SAWYER, M.B., GURMENDI, A.C., DALEY, M.R., AND HOWELL, S.B., 1992, PRINCIPAL DEPOSITS OF STRATEGIC AND CRITICAL MINERALS IN ARIZONA: U.S. BUREAU OF MINES SPECIAL PUBLICATION, 334 P.