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Lavender Open Pit Mine (Lavender pit), Bisbee, Warren District, Mule Mts, Cochise Co., Arizona, USA
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Latitude: 31°25'55"N
Longitude: 109°53'55"W
 
 
A former large output surface Cu-Au-Ag-Zn-Gemstone mine located in the SW¼ sec 10, NW¼NW¼ sec. 15, T.23S., R.24E. Bisbee 7.5 minute topo map), NW edge of Lowell, on private land. Produced 1954-1974. Owned by the Phelps Dodge Corp.

Mineralization is a porphyry copper deposit with a blanket ore body of low grade disseminated chalcocite with local spots of other copper and zinc sulfides in a blanket deposit in a brecciated intrusive porphyry plug adjoining altered Paleozoic limestones along the Dividend fault. Ore concentration was bornite replacing pyrite. An associated rock unit is the Sacramento Hill Stock. Low-grade copper ores. The turquoise was a hard, deep blue, sometimes found in a matrix of hard red mineral (cuprite?).

Local structures include pre-mineralization faulting and tilting. Main fault directions are N10W to N40E and S30W to N50W. The Dividend Fault "horsetails", its strike is N20E and it dips S70. Displacement along the fault is about 500 feet. This fault Separates the Sacramento/Lavendar pit and the extension to the east (Cochise project).

Workings are a huge open pit 914.4 meters long (1,219.2 meters overall length) by 457.2 meters wide and over 750 feet deep (more than 15, 50 foot high benches). Some 75 million tons of ore were produced from 1954 to 1970.

The current highway follows the Dividend Fault. Large bulk mineable, low-grade porphyry copper ore. There is substantial supergene ground water enrichment at the base of the leach cap. There is a substantial reserve of Cu ore. The chalcocite blanket was nearly mined out but recent exploration (1989-1991) has identified several high-grade polymetallic targets in the Mississippian limestone. Future open pit mining would use electro-winning solution leach processing methods.

Mineral List

Alunite
Azurite
Baryte
'Biotite'
Bornite
Brochantite
Calcite
Carbonatecyanotrichite
Chalcanthite
Chalcoalumite
Chalcocite
Chalcopyrite
'Chlorite Group'
Chrysocolla
Copper
Cuprite
var: Chalcotrichite
Diaspore
Dickite
Enargite
Epidote
Ferrimolybdite
Galena
Hematite
var: Specularite
Kaolinite
Liroconite
Magnetite
Malachite
Muscovite
var: Sericite

Pharmacosiderite
Pyrite
Pyrophyllite
Sphalerite
Stromeyerite
Sulphur
Szomolnokite
Tetrahedrite
Turquoise


39 entries listed. 34 valid minerals.

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References

Galbraith, F.W. & D.J. Brennan (1959), Minerals of Arizona: 74.

Bryant, D.G. & H.E. Metz (1966), Geology and ore deposits of the Warren mining district, in S.R. Titley and C.L. Hicks (editors), Geology of the porphyry copper deposits, southwestern North America, University of Arizona Press, Tucson: 191, 197-199.

Keith, Stanton B. (1973), Arizona Bureau of Mines Bull. 187, Index of Mining Properties in Cochise County, AZ: 88 (Table 4).

Blair, Gerry (1992), The Rockhound's Guide to Arizona: Helena, MT, Falcon Press.

Niemuth, N.J. & K.A. Phillips (1992), Copper Oxide Resources, Arizona Department of Mines & Minerals Resources Open File Report 92-10: 5 (Table 1).

Graeme, R. (1993), Bisbee revisited, Mineralogical Record: 24: 421-436.

Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd. ed.: 160, 162, 203, 220, 245, 344, 386, 388.

Singer, D.A., Berger, V.I., and Moring, B.C. (2005): Porphyry Copper Deposits of the World: Database, Map, and Grade and Tonnage Models. USGS Open-File Report 05-1060.

Grant, Raymond W., Bideaux, R.A., and Williams, S.A. (2006) Minerals Added to the Arizona List 1995-2005: 5.

Arizona Bureau of Mines files.

MRDS database Dep. ID file #10046238, MRDS ID M241102; and, Dep. ID #10137191, MAS ID #0040030044.

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