Mine detail: Longfellow Mine

Previously called 'Part Ofarizona Copper Co GroupLongfellow Incline'

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Location

Lat / long:

33.08454, -109.35871

Resource(B)

Primary:	Copper, Kaolin
Secondary:	Silver, Gold
Ore:	Chalcocite, Chalcopyrite, Cuprite, Kaolin, Kaolinite, Malachite, Pyrite, Sphalerite
Gangue:	Epidote, Garnet, Hornblende, Limonite, Magnetite, Tremolite
Orebody form:	IRREGULAR
Discovery year:	1872

Production

Operation type:	Unknown
Production size:	Medium
Development status:	Producer
First production started:	1882
Last production ended:	1932

Geology

Host rock:	Longfellow Limestone;Morenci Shale
Host type:	Limestone
Associated rock:	Coronado Quartzite;Morenci Granite Porphyry
Associated type:	Quartz Monzonite
Structure:	Ore Bodies In Region Tend To Follow Porphyry Contacts, Well-Defined Fault With Strike Of N65w And Upthrow On South Side Of 80 To 100 Ft; 3 Main Porphyry Dikes That Trend Ene, Widen Considerably With Depth (From 20 Ft Wide On Surface To 90 Ft Wide At Depth), And Send Out Horizontal Sheets In The Lower Part Of The Longfellow Limestone
Tectonic:	Precipitous Gully Terrain; Coronado Quartzite Forms Cliffs 200 Ft High And Lower Slopes Of Modoc Mountain Were Practically Inaccessible Before Morenci Open Pit Was Developed
Alteration processes:	Sericitized Porphyry. Morenci Shale Shows Hardening And Introduction Of Epidote; Limestone Contains Seams Of Magnetite Intergrown With Pyrite, Chalcopyrite, And Prisms Of Pyroxene; Substantial Surface Oxidation To Limonite And Kaolin

References

MRDS	M800406
DEP	10048281
Reference	{Deposit:: ABGMT-USBM FILE DATA.}{Deposit:: USBM FILES, LONGFELLOW INCLINE.}{Deposit:: ABGMT CLIPPING FILE, LONGFELLOW EXTENSION COPPER CO, ARIZONA COPPER CO LTD.}{Deposit:: BLM DISTRICT SHEET 840 AND 839.}{Deposit:: USGS PP 43, P. 233-239.}{Deposit:: STEVENS, H.J., 1911, THE COPPER HANDBOOK, VOL X, PAGES 356-357, ARIZONA COPPER CO LTD.}{Deposit:: WEED, W.H., 1918, THE MINES HANDBOOK, VOL. X111, PAGE 470, ARIZONA COPPER CO LTD.}{Deposit:: TENNEY, JAMES B., HISTORY OF MINING IN ARIZONA, VOL. 1, P. 97.}{Deposit:: BENNETT, 1975, GEOLOGY AND ORIGIN OF THE BRECCIAS IN THE MORENCI-METCALF DISTRICT, GREENLEE CO., AZ: MS THESIS UNIV OF AZ.}{Deposit:: PHILLIPS, K.A., 1987, ARIZONA INDUSTRIAL MINERALS: ARIZONA DEPARTMENT OF MINES AND MINERAL RESOURCES MINERAL REPORT 4, 185 P.}{Other Database:: CIMRI}
Reporter	Calder, Susan R., Orris, Greta J.