Illinois Mine

Santa Cruz County, Arizona, United States

Copper Zinc Silver Lead Gold

Land & claims · BLM · live

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BLM MLRS ↗Claims at this point ↗Surface mgmt ↗

Surface manager + active mining claims at this point, live from BLM. The "open to location" notes are a general 1872-Mining-Law guide, not BLM output — decision-support only; verify with BLM MLRS and on the ground before staking or entry.

Commodities

PrimaryCopper, Zinc

SecondarySilver, Lead

TertiaryGold

Commodity typeMetallic

Deposit

Deposit sizeSmall

Orebody formBUNCHES

Ore controlIrregular Deposits And Ore Pipes Along N-S Trending Fault Contact Between Pyrometamorphosed Limestone And Tri-Jur Volcanics

Materials

Ore mineralsChalcopyrite, Galena, Pyrite, Sphalerite

GangueQuartz

Geology

Host rockMarble,Limestone · Epitaph Dolomite

Associated rockVolcanic Rock (Aphanitic),Rhyolite

StructureMineral Deposits Of Washington-Duquesne Area Occupy A Limestone-Sediment Belt (2.5 Miles Long And 1.25 Miles Wide) Surrounded By Igneous Rocks Which Also Form Detached Masses And Dikes Within Belt, Limestone Near Contact Shows Evidence Of Sheeting Or Inconspicuous High-Angle Faulting

Tectonic settingN-S Trending Bonanza Fault Zone; Washington Camp Fault Block To West And Downthrown Duquesne Fault Block To East

AlterationCoarsely Crystalline Limestone Has Been Contact Metamorphosed To Marble

Economic & production

Development statusProducer

Last production1959

Discovery year1875

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References

ABGMT-USBM FILE DATAUSBM FILES, ILLINOIS MINEADMR FILE DATA, ILLINOIS MINEBLM DISTRICT MINING SHEET 727ARIZ BUR MINES BULL 191, P. 78ABGMT FILES STANTON B. KEITHTENNEY, JAMES B. 1927-29, HISTORY OF MINING IN ARIZONA; ARIZONA BUREAU OF MINES, P. 293-300USGS MAP I-762LEHMAN, NORMAN E., 1978, THE GEOLOGY AND PYROMETASOMATIC ORE DEPOSITS OF THE WASHINGTON CAMP-DUQUESNE DISTRICT, SANTA CRUZ COUNTY, ARIZONA; PHD. DISSERTATION, UNIVERSITY OF ARIZONA, P. 126-143, MAPSKEITH, 1975

Identification

Deposit ID10109795

MRDS IDM241343

RegionNA

Data scoreB

Coordinates31.3707, -110.68789