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Keating Mine (Keating group), Dover Copper Mines (Gold Belt Mines/group; Dover Copper group; Copper Plate Mine), Copper Mountain District (Clifton-Morenci District), Shannon Mts, Greenlee Co., Arizona, USA

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A former surface and underground Cu-Ag-Au-Pb-Zn group of claims/mines located in the SW¼ sec. 6, NW¼NW¼ sec. 7, NW¼ sec. 18, T4S, R29E (Clifton 15 minute topo map), 0.25 miles SE of Water Spring at the head of Horseshoe Gulch and lies on shared border of secs. 6 & 7, on private land. 136 patented claims owned by Dover Copper Mining Co (1957). Patented mining claims extend into secs. 14, 11, 12, 7, 18-21, 28, 29, 12, 11 and 14 are located in T4S, R28E. Owned by the Dover Copper Mining Co.; Principal Owner: W. V. Tiscornia (1957).

Mineralization is an irregular ore body (linear) hosted in the Longfellow Limestone (and Pinkard Sandstone and Shale). Associated rock units are the Morenci Granite Porphyry and the Coronado Quartzite. Ore control was a NE-trending small fault fissure between granite on the south and quartzite on the north. Ore concentration was intense surface leaching; supergene enrichment concentration in ore pockets along altered quartz veins. Alteration is intense surface oxidation to unknown depths and the formation of gossans. The limestone is greatly altered to epidote and magnetite with copper stains and pyrite. Irregular deposits of gold are contained in limonite along the vein. The vein follows epidotized contact of a porphyry dike in limestone.

Development of the Keating Mine included two 250 foot deep shafts, three winzes of 10 to 119 feet, and several tunnels. The Keating Mine was the most productive of all mines owned by the Dover Copper Mining Co.

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References

MRDS database Dep. ID #10048286, MRDS ID #M800413.

 
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