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Midnight Mine (Keating Mine; Hormeyer Mine; Wonderful Mine; Modoc No. 2 patented claim MS 4577; Patented claim MS 1545), Copper Mountain District (Clifton-Morenci District), Shannon Mts, Greenlee Co., Arizona, USA

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A former surface and undergrond Cu-Au-Pb-Ag-Mn mine located on one patented lode claim, in the SE¼NE¼ sec. 24, T4S, R29E, 2.0 miles N of Clifton on the W side of the San Francisco River, at the end of the jeep trail that leaves highway 191 (old highway 666) at Rock House Canyon and heads NE, on private land. Discovered by Anwell Lafaves in 1903. Produced 1910-1942. Owned by Ms Harriet Sweeting of Clifton, AZ (1960). Operators included Mr. Ed C. Rozell.

Mineralization is a flat tabular ore body hosted in the Modoc Limestone, Morenci Shale, and the Longfellow Limestone. It is 182.88 meters long, with a depth to bottom of 60.96 meters, and is 60.96 meters thick, strikes NE and dips 20NW. Continuous mineralized layers penetrate hanging and foot walls to form irregular bodies. Dimension of the deposit were estimated from surface cuts. An associated rock unit is the Morenci Granite Porphyry. Ore control was a NE-trending fault and intrusive quartzite dike cutting contacts of limestone and sandstone. Ore concentration was secondary enrichment concentration along sedimentary bedding planes and the quartzite dike. The deposit is a replacement of interbedded sandstone and limestone sequences.

Area structures include porphyry dikes cutting sedimentary sequences; NE-trending faults; and intrusive igneous dikes associated with the Morenci Porphyry stock.

Tectonic component is the transition zone between the Basin and Range and Colorado Plateau Provinces.

Workings included 2 surface stopes with dimensions of 50 feet by 40 feet by 40 feet, 3 tunnels, and 2 crosscuts. Workings total 283.46 meters in length.

Mineral List

6 entries listed. 4 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.


Wilson, E.D., Cunningham, J.B., and Butler, G.M. (1934), Arizona Lode Gold Mines and Gold Mining. Arizona Bureau of Mines Bull. 137: 187.

Kuhn, T.H. (1938) Some Arizona Ore Deposits. Arizona Bureau of Mines Bull. 145, No. 12: 75-77.

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 Mines - Arizona Bureau of Geology and Mining Technology file data.

Arizona Department of Mineral Resources Midnight file.

U.S. Bureau of Land Management Mining District Sheet #842.

USGS Clifton Quadrangle map.

MRDS database Dep. ID #10088899, MRDS ID #M800405.

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