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

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Key
Latitude & Longitude (WGS84):
33° 5' 3'' North , 109° 21' 29'' West
Latitude & Longitude (decimal):
Locality type:
Nearest Settlements:
PlacePopulationDistance
Morenci1,489 (2011)0.9km
Clifton3,685 (2017)6.8km
York557 (2011)25.6km
San Jose506 (2011)36.6km
Solomon426 (2011)39.7km


A former surface and underground Cu-Au-Ag-clay mine located in the NE¼SE¼ & in the SE¼NE¼ sec. 16, and in the W½NW¼ sec. 15, T4S, R29E, in the Morenci open pit just N of Modoc Mountain. The upper workings of the Longfellow ore body extend over the East Yankee, Longfellow, and Longfellow Extension claims. Discovered by Robert Metcalf in 1872. Produced 1882-1932. Owned and operated by the Phelps Dodge Corp., Morenci Branch (as part of the Morenci Open Pit). Prior operators included the Longfellow Extension Copper Co.; the Arizona Copper Co. Ltd.; Leszynsky Brothers; and the Longfellow Mining Co.

Mineralization is an irregular ore body hosted in the Longfellow Limestone and Morenci Shale. The ore zone is 121.92 meters wide with a depth to bottom of 121.92 meters. Ore control was a funnel-shaped mass that occurs between two large porphyry dikes. Irregular and tabular deposits of very rich oxidized ores along the contact between limestone and porphyry. Associated rock units are the Coronado Quartzite and the Morenci Granite Porphyry. Ore concentration was secondary enrichment along sedimentary rock and porphyrycontacts, and between dikes. The porphyry dikes are somewhat mineralized but have no economic value. Mineralization was partially facilitated by the fault.

The principal stopes between the north and middle dikes displayed essentially cuprite with small amounts of manganese dioxide while stopes between the middle and south dikes showed copper carbonates with large amounts of black manganese. Pure kaolin occurs extensively in the mine. The Cu ore bodies narrow with depth.

Alteration is sericitized porphyry. The Morenci shale shows hardening and introduction of epidote. The limestone contains seams of magnetite intergrown with pyrite, chalcopyrite and prisms of pyroxene. Substantial surface oxidation to limonite and kaolin is present.

Local structures include a well-defined fault with strike of N65°W and upthrow on the south side of 80 to 100 feet. Three main porphyry dikes that trend ENE, widen considerably with depth (from 20 feet wide on surface to 90 feet wide at depth), and send out horizontal sheets in the lower part of the Longfellow Limestone. Ore bodies in the region tend to follow porphyry contacts.

Workings total 646.18 meters long and 137.16 meters deep. Developments included tunnels on 4 levels, stoping, open pit mining, one incline with a vertical run of about 80 feet.; The section of the Longfellow workings that lies on the East Yankee claim was developed by 4 levels from the East Yankee shaft (Detroit Copper Mining Co. of Arizona). A 1300 foot tunnel was driven from Chase Creek connects with a 600 foot blind shaft (winze).

Regions containing this locality

North America PlateTectonic Plate
Sonoran Desert, North AmericaDesert

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


12 valid minerals.

Detailed Mineral List:

Azurite
Formula: Cu3(CO3)2(OH)2
Description: Sheaflike & spherical masses to 40 pounds weight 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 N.Y. Acad. Sci.: 3: 275-278; Farrington, O.C. (1891), On crystallized azurite from AZ, Amer. Jour. Sci.: 41: 300-307; Bideaux, R.A. (1973), The collector (on azurite), Min.Rec.: 4: 34-35; Dana 6: 297 & 1094; Univ. AZ Bull. 41 (1916-17), Mineralogy of Useful Minerals in AZ: 23;, 42.
Chalcocite
Formula: Cu2S
Reference: MRDS database Dep. ID #10048281, MRDS ID #M800406.
Chalcopyrite
Formula: CuFeS2
Reference: MRDS database Dep. ID #10048281, MRDS ID #M800406.
Copper
Formula: Cu
Reference: Dana 6: 297 & 1094.
Cuprite
Formula: Cu2O
Reference: Dana 6: 297 & 1094.
Epidote
Formula: {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Reference: MRDS database Dep. ID #10048281, MRDS ID #M800406.
'Garnet Group'
Formula: X3Z2(SiO4)3
Reference: MRDS database Dep. ID #10048281, MRDS ID #M800406.
'Hornblende'
Reference: MRDS database Dep. ID #10048281, MRDS ID #M800406.
Kaolinite
Formula: Al2(Si2O5)(OH)4
Description: Occurs in large masses.
Reference: Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 125, 266; Univ. AZ Bull. 41 (1916-17), Mineralogy of Useful Minerals in AZ: 42; Galbraith, F.W. & D.J. Brennan (1959), Minerals of AZ: 108.
'Limonite'
Formula: (Fe,O,OH,H2O)
Reference: MRDS database Dep. ID #10048281, MRDS ID #M800406.
Magnetite
Formula: Fe2+Fe3+2O4
Reference: MRDS database Dep. ID #10048281, MRDS ID #M800406.
Malachite
Formula: Cu2(CO3)(OH)2
Reference: Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 286; Lindgren, W. (1903), The copper deposits of Clifton, AZ, Engr. Mining Jour.: 75: 705; Lindgren, W. (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; Schwartz, G.M. (1934), Paragenesis of the oxidized ores of copper, Econ.Geol.: 29: 55-75; 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; Dana 6: 297 & 1094.
Pyrite
Formula: FeS2
Reference: MRDS database Dep. ID #10048281, MRDS ID #M800406.
Sphalerite
Formula: ZnS
Reference: MRDS database Dep. ID #10048281, MRDS ID #M800406.
Tremolite
Formula: ☐{Ca2}{Mg5}(Si8O22)(OH)2
Reference: MRDS database Dep. ID #10048281, MRDS ID #M800406.

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
Copper1.AA.05Cu
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
Magnetite4.BB.05Fe2+Fe3+2O4
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
Tremolite9.DE.10☐{Ca2}{Mg5}(Si8O22)(OH)2
Unclassified Minerals, Rocks, etc.
'Garnet Group'-X3Z2(SiO4)3
'Hornblende'-
'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
Copper1.1.1.3Cu
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
Group 7 - MULTIPLE OXIDES
AB2X4
Magnetite7.2.2.3Fe2+Fe3+2O4
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)
Group 66 - INOSILICATES Double-Width,Unbranched Chains,(W=2)
Amphiboles - Mg-Fe-Mn-Li subgroup
Tremolite66.1.3a.1☐{Ca2}{Mg5}(Si8O22)(OH)2
Unclassified Minerals, Mixtures, etc.
'Garnet Group'-X3Z2(SiO4)3
'Hornblende'-
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 MalachiteCu2(CO3)(OH)2
H KaoliniteAl2(Si2O5)(OH)4
H Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
H Limonite(Fe,O,OH,H2O)
H Tremolite☐{Ca2}{Mg5}(Si8O22)(OH)2
CCarbon
C AzuriteCu3(CO3)2(OH)2
C MalachiteCu2(CO3)(OH)2
OOxygen
O AzuriteCu3(CO3)2(OH)2
O MalachiteCu2(CO3)(OH)2
O CupriteCu2O
O KaoliniteAl2(Si2O5)(OH)4
O Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
O Garnet GroupX3Z2(SiO4)3
O Limonite(Fe,O,OH,H2O)
O MagnetiteFe2+Fe23+O4
O Tremolite☐{Ca2}{Mg5}(Si8O22)(OH)2
MgMagnesium
Mg Tremolite☐{Ca2}{Mg5}(Si8O22)(OH)2
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
Si Tremolite☐{Ca2}{Mg5}(Si8O22)(OH)2
SSulfur
S PyriteFeS2
S SphaleriteZnS
S ChalcociteCu2S
S ChalcopyriteCuFeS2
CaCalcium
Ca Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Ca Tremolite☐{Ca2}{Mg5}(Si8O22)(OH)2
FeIron
Fe PyriteFeS2
Fe Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Fe Limonite(Fe,O,OH,H2O)
Fe MagnetiteFe2+Fe23+O4
Fe ChalcopyriteCuFeS2
CuCopper
Cu AzuriteCu3(CO3)2(OH)2
Cu MalachiteCu2(CO3)(OH)2
Cu CupriteCu2O
Cu CopperCu
Cu ChalcociteCu2S
Cu ChalcopyriteCuFeS2
ZnZinc
Zn SphaleriteZnS

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.
Dana, E.S. (1892) System of Mineralogy, 6th. Edition, New York: 297, 1094.
Lindgren, W. (1903), The copper deposits of Clifton, Arizona, Engineering and Mining Journal: 75: 705
Lindgren, W. (1904), The genesis of copper deposits, Engineering and Mining Journal: 78: 987.
Lindgren, W. (1905), The copper deposits of the Clifton-Morenci district, AZ, USGS PP 43: 233-239.
Stevens, P. (1911) The Copper Handbook: Vol. X: 356-357, Arizona Copper Co. Ltd.
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 Ariaona: 23;, 42, 44.
Weed, W.H. (1918) The Mines Handbook, Vol. XIII: 470, Arizona Copper Co. Ltd.
Tenny, J.B. (1927-1929) History of Mining in Arizona, Special Collection, University of Arizona Library & Arizona Bureau of Mines Library: Vol. 1: 97.
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.
Cleland, Robert G. (1952) A History of Phelps Dodge.
Dunning, C.H. (1959) Rock to Riches: 116-118.
Galbraith, F.W. & D.J. Brennan (1959), Minerals of AZ: 55, 108.
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.
Phillips, K.A. (1987), Arizona Industrial Minerals, 2nd. Edition, Arizona Department of Mines & Minerals Mineral Report 4, 185 pp.
Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 125, 266, 286.
USGS Clifton Quadrangle map.
U.S. Bureau of Mines - Arizona Bureau of Geology and Mining Technology production file data.
USGS Geologic Atlas Clifton Folio Arizona (1905) - Economic Geology Map.
U.S. Bureau of Land Management Mining District Sheets #840 & #839.
MRDS database Dep. ID #10048281, MRDS ID #M800406; and Dep. ID #10209853, MAS ID #0040110135.

USGS MRDS Record:10048281
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