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Detroit Mine (Arizona Copper Co. group [in part]), Morenci, Copper Mountain Mining District (Clifton-Morenci Mining District), Shannon Mts, Greenlee Co., Arizona, USAi
Regional Level Types
Detroit Mine (Arizona Copper Co. group [in part])Mine
Morenci- not defined -
Copper Mountain Mining District (Clifton-Morenci Mining District)Mining District
Shannon MtsMountain Range
Greenlee Co.County
ArizonaState
USACountry

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Key
Latitude & Longitude (WGS84):
33° 4' 36'' North , 109° 21' 52'' West
Latitude & Longitude (decimal):
Locality type:
Nearest Settlements:
PlacePopulationDistance
Morenci1,489 (2011)0.2km
Clifton3,685 (2017)7.0km
York557 (2011)25.3km
San Jose506 (2011)35.5km
Solomon426 (2011)38.6km


A former surface and underground Cu-Ag-Zn-Mn mine located in the S½SE¼ sec. 16 and in the N½NE¼ sec. 21, T4S, R29E, to the E of the Manganese Blue Mine and to the S of the Copper Mountain Mine, under the present town of Morenci, on private land. Discovered 1884. Produced 1884-1932. Formerly owned by the Arizona Copper Co., Ltd. Owned and operated by the Phelps Dodge Corp., Morenci Branch.

Mineralization is a tabular ore body hosted in the Modoc Limestone and Morenci Shale. The ore zone is 121.92 meters long, with a depth to top of 22.86 meters and depth to bottom of 121.92 meters, at 12.19 meters thick, striking NW and dipping 10SW. Ore chiefly contains malachite and azurite; chalcocite and cuprite are rare. An associated rock unit is the Morenci Granite Porphyry. Ore control was several ore-bearing horizons contained in limestone and separated by barren material. The main ore body contained between two large porphyry dikes (Joy and Hummingbird dikes) that both dip 60° to 70° NW, and lies immediately under heavy garnet rock and is about 25 feet thick. A lower ore body of 5 foot thickness is separated from the main ore body by a barren lime-shale sequence.

Ore concentration was mineralization along bedding planes; supergene enrichment facilitated by the Copper Mountain Fault. Alteration involves the upper beds of the Modoc Limestone altered to garnet rock. The ore is entirely oxidized.

Area structures are the Copper Mountain Fault, which dislocates both dikes. The east side of the fault shows SE horizontal throw of 5o to 70 feet. The mine is located just S of the main porphyry contact at Morenci. Garnet in the exposed Modoc Limestone Formation forms a caprock of 75 to 100 feet thickness. Porphyry dikes generally do not contain ore but are occasionally cut by vertical seams of pyrite.

Workings are 121.92 meters deep. Developments included the 224 foot deep Detroit shaft with 4 levels; connections to the Joy shaft. Several adits connected by a maze of irregular stopes and workings; 400 foot deep South shaft near the Copper Mountain Fault.

Production data included in the Longfellow-Metcalf Mine. Longfellow Metcalf also includes the Mammoth, Yavapai, Longfellow, Metcalf, Coronado, Joy, and Humboldt Mines of the Arizona Copper Co. Ltd. Ore reported to be nearly exhausted in 1905. Total production estimated at 150,000 tons. The Detroit and Longfellow Mines were the largest producers for the Arizona Copper Co. Ltd. The Detroit Mine should not be confused with the Detroit Copper Co. mines at Morenci.

Regions containing this locality

North America PlateTectonic Plate
Sonoran Desert, North AmericaDesert

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


11 valid minerals.

Detailed Mineral List:

Azurite
Formula: Cu3(CO3)2(OH)2
Description: Sheaf-like & spherical masses to 40 pounds in kaolinized shale.
Reference: Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 125; Kunz, G.F. (1885), On remarkable copper minerals from AZ, Annals NY Acad. Sci.: 3: 275-278; Farrington, O.C. (1891), On crystallized azurite from AZ, Amer. Jour. Sci.: 41: 300-307; Schwartz, G.M. (1934), Paragenesis of the oxidized ores of copper, Econ.Geol.: 29: 55-75; Bideaux, R.A. (1973), The collector (on azurite), Min.Rec.: 4: 34-35; Galbraith, F.W. & D.J. Brennan (1959), Minerals of AZ: 55.
Chalcocite
Formula: Cu2S
Reference: MRDS database Dep. ID #10048296, MRDS ID #M800428.; USGS Bulletin 625
Chalcopyrite
Formula: CuFeS2
Reference: MRDS database Dep. ID #10048296, MRDS ID #M800428.
Cuprite
Formula: Cu2O
Reference: MRDS database Dep. ID #10048296, MRDS ID #M800428.
Epidote
Formula: {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Reference: MRDS database Dep. ID #10048296, MRDS ID #M800428.
'Garnet Group'
Formula: X3Z2(SiO4)3
Reference: MRDS database Dep. ID #10048296, MRDS ID #M800428.
Hematite
Formula: Fe2O3
Reference: MRDS database Dep. ID #10048296, MRDS ID #M800428.
Kaolinite
Formula: Al2(Si2O5)(OH)4
Description: Occurs as kaolinized shale.
Reference: MRDS database Dep. ID #10048296, MRDS ID #M800428.
'Limonite'
Formula: (Fe,O,OH,H2O)
Reference: MRDS database Dep. ID #10048296, MRDS ID #M800428.
Malachite
Formula: Cu2(CO3)(OH)2
Reference: Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 286; Schwartz, G.M. (1934), Paragenesis of the oxidized ores of copper, Econ.Geol.: 29: 55-75; Lindgren, W. (1903), The copper deposits of Clifton, AZ, Engr. Mining Jour.: 75: 705; Lindgren (1904), The genesis of copper deposits, Engr. Mining Jour.: 78: 987; Lindgren, W. (1905), The copper deposits of the Clifton-Morenci District, AZ, USGS PP 43; Reber, L.E., Jr. (1916), The mineralization at Clifton-Morenci, Econ.Geol.: 11: 528-573; Grout, F.E. (1946), Microscopic characters of vein carbonates, Econ.Geol.: 41: 475-502; Univ.. AZ Bull. 41 (1916-17), Mineralogy of Useful Minerals in AZ: 44.
Pyrite
Formula: FeS2
Reference: MRDS database Dep. ID #10048296, MRDS ID #M800428.; USGS Bulletin 625
Silver
Formula: Ag
Reference: Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 372.
Sphalerite
Formula: ZnS
Reference: MRDS database Dep. ID #10048296, MRDS ID #M800428.

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
Silver1.AA.05Ag
Group 2 - Sulphides and Sulfosalts
Chalcocite2.BA.05Cu2S
Chalcopyrite2.CB.10aCuFeS2
Pyrite2.EB.05aFeS2
Sphalerite2.CB.05aZnS
Group 4 - Oxides and Hydroxides
Cuprite4.AA.10Cu2O
Hematite4.CB.05Fe2O3
Group 5 - Nitrates and Carbonates
Azurite5.BA.05Cu3(CO3)2(OH)2
Malachite5.BA.10Cu2(CO3)(OH)2
Group 9 - Silicates
Epidote9.BG.05a{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Kaolinite9.ED.05Al2(Si2O5)(OH)4
Unclassified Minerals, Rocks, etc.
'Garnet Group'-X3Z2(SiO4)3
'Limonite'-(Fe,O,OH,H2O)

List of minerals arranged by Dana 8th Edition classification

Group 1 - NATIVE ELEMENTS AND ALLOYS
Metals, other than the Platinum Group
Silver1.1.1.2Ag
Group 2 - SULFIDES
AmBnXp, with (m+n):p = 2:1
Chalcocite2.4.7.1Cu2S
AmXp, with m:p = 1:1
Sphalerite2.8.2.1ZnS
AmBnXp, with (m+n):p = 1:1
Chalcopyrite2.9.1.1CuFeS2
AmBnXp, with (m+n):p = 1:2
Pyrite2.12.1.1FeS2
Group 4 - SIMPLE OXIDES
A2X
Cuprite4.1.1.1Cu2O
A2X3
Hematite4.3.1.2Fe2O3
Group 16a - ANHYDROUS CARBONATES CONTAINING HYDROXYL OR HALOGEN
Azurite16a.2.1.1Cu3(CO3)2(OH)2
Malachite16a.3.1.1Cu2(CO3)(OH)2
Group 58 - SOROSILICATES Insular, Mixed, Single, and Larger Tetrahedral Groups
Insular, Mixed, Single, and Larger Tetrahedral Groups with cations in [6] and higher coordination; single and double groups (n = 1, 2)
Epidote58.2.1a.7{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Unclassified Minerals, Mixtures, etc.
'Garnet Group'-X3Z2(SiO4)3
Kaolinite-Al2(Si2O5)(OH)4
'Limonite'-(Fe,O,OH,H2O)

List of minerals for each chemical element

HHydrogen
H AzuriteCu3(CO3)2(OH)2
H KaoliniteAl2(Si2O5)(OH)4
H MalachiteCu2(CO3)(OH)2
H Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
H Limonite(Fe,O,OH,H2O)
CCarbon
C AzuriteCu3(CO3)2(OH)2
C MalachiteCu2(CO3)(OH)2
OOxygen
O AzuriteCu3(CO3)2(OH)2
O KaoliniteAl2(Si2O5)(OH)4
O MalachiteCu2(CO3)(OH)2
O CupriteCu2O
O Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
O Garnet GroupX3Z2(SiO4)3
O HematiteFe2O3
O Limonite(Fe,O,OH,H2O)
AlAluminium
Al KaoliniteAl2(Si2O5)(OH)4
Al Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
SiSilicon
Si KaoliniteAl2(Si2O5)(OH)4
Si Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Si Garnet GroupX3Z2(SiO4)3
SSulfur
S ChalcociteCu2S
S ChalcopyriteCuFeS2
S PyriteFeS2
S SphaleriteZnS
CaCalcium
Ca Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
FeIron
Fe ChalcopyriteCuFeS2
Fe PyriteFeS2
Fe Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Fe HematiteFe2O3
Fe Limonite(Fe,O,OH,H2O)
CuCopper
Cu AzuriteCu3(CO3)2(OH)2
Cu MalachiteCu2(CO3)(OH)2
Cu ChalcociteCu2S
Cu ChalcopyriteCuFeS2
Cu CupriteCu2O
ZnZinc
Zn SphaleriteZnS
AgSilver
Ag SilverAg

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Kunz, G.F. (1885), On remarkable copper minerals from Arizona, Annals of the New York Academy of Science: 3: 275-278.
Farrington, O.C. (1891), On crystallized azurite from Arizona, American Journal of Science: 41: 300-307.
Lindgren, W. (1903), The copper deposits of Clifton, Arizona, Engineering and Mining Journal: 75: 705.
Lindgren (1904), The genesis of copper deposits, Engineering and Mining Journal: 78: 987.
Lindgren, W. (1905), The copper deposits of the Clifton-Morenci District, Arizona, USGS Professional Paper 43: 229-230.
Reber, L.E., Jr. (1916), The mineralization at Clifton-Morenci, Economic Geology: 11: 528-573.
University of Arizona Bull. 41 (1916-17), Mineralogy of Useful Minerals in Arizona: 44;
Schwartz, G.M. (1934), Paragenesis of the oxidized ores of copper, Economic Geology: 29: 55-75.
Grout, F.E. (1946), Microscopic characters of vein carbonates, Economic Geology: 41: 475-502.
Galbraith, F.W. & D.J. Brennan (1959), Minerals of Arizona: 55.
Farnham, L.L., Stewart, L.A., and Delong, C.W. (1961), Manganese Deposits of Eastern Arizona, US Bureau of Mines Information Circular 7990: 103.
Johnson, M.G. (1972), Placer gold deposits of Arizona, USGS Bull. 1355: 15-16.
Bideaux, R.A. (1973), The collector (on azurite), Mineralogical Record: 4: 34-35.
Bennett (1975) Geology and Origin of the Breccias in the Morenci-Metcalf District, Greenlee County, Arizona, MS thesis, University of Arizona, 153 pp.
Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd. ed.: 125, 286, 372.
U.S. Bureau of Mines - Arizona Bureau of Geology and Mining Technology file data.
U.S. Bureau of Land Management Mining District Sheets #840 & #841.
MRDS database Dep. ID #10048296, MRDS ID #M800428.

USGS MRDS Record:10048296
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