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Iolanthe prospect (Dead Pine prospect; El Moro prospect), King Gulch, Copper Mountain District (Clifton-Morenci District), Shannon Mts, Greenlee Co., Arizona, USA

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A former underground Cu mine located on three patented claims (Iolanthe; Dead Pine; El Moro) in the SE¼SE¼ sec. 27 and the NE¼NE¼ sec. 34, T3S, R29E, 2¼ miles NE of Metcalf in King Gulch, on private land. Located near the top of the divide separating Placer and King Gulches; on the NW side of the ridge descending into King Gulch. The Iolanthe claim extends into the SW quarter of sec. 26 and the NW quarter of sec. 35. Discovered in 1875. Last produced in 1902. Owned by Phelps Dodge Corp., Morenci Branch (1922). Owners included the Arizona Copper Co. Ltd.

Mineralization is a contact metamorphic deposit with irregular masses of ore hosted in Modoc Limestone, Morenci Shale and the Longfellow Limestone. An associated rock unit is the Morenci Granite Porphyry. Ore control was deposition along the limestone-porphyry contact as secondary enrichment. The deposit is masked by heavy oxidation. This deposit was probably originally characterized by garnet and epidote gangue.

Area structures include NE-trending narrow porphyry dikes in the vicinity. Veins in the region consist of many very sharply defined fissure planes striking NNE. The Morenci Porphyry intrusion in the locality is fragmented by masses of quartzite, limestone and shale.

Area tectonic element is block faulting NW of the Copper King Massif with a downthrow of about 1000 feet.

Workings include two or three tunnels on the N side of the ridge. Production data might be included in Longfellow Metcalf data. Longfellow Metcalf also includes the other Arizona Copper Co. Ltd. mines of Longfellow, Metcalf, Coronado, Detroit, Joy, Yavapai, Humboldt, and Mammoth.

Mineral List

3 entries listed. 2 valid minerals.

The above list contains all mineral locality references listed on This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.


Lindgren W. (1905) The Copper Deposits of the Clifton-Morenci District, Arizona. USGS Professional Paper 43: 363.

Bennett (1975) Geology and Origin of the Breccias in the Morenci-Metcalf District, Greenlee County, Arizona, MS thesis, University of Arizona, 153 pp.

U.S. Bureau of Land Management Mining District Sheet #838.

MRDS database Dep. ID #10027005, MRDS ID #M001701.

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