LinariteMammoth Mine, Garfield Gulch, Copper Mountain District, Shannon Mts, Greenlee Co., Arizona, USA
Photo: Pedro González Latitude: 33°8'18"N
Longitude: 109°21'30"W
A former underground Cu mine located on 2 patented claims (Mammoth and Little Mammoth) in the SE¼ sec. 28, T3S, R29E, in Garfield Gulch, 0.5 mile E from the mouth of the canyon; 2.0 miles NW of Metcalf, on private land. Claims extend into the SE quarter of sec. 27. Discovered in 1872 by Isaac Stevens. First produced in 1890. Owned and operated by the Phelps Dodge Corp., Morenci Branch (1922-____). Past owners and operators included Robert Metcalf; the Leszynsky Brothers; and, the Arizona Copper Co. Ltd.
Mineralization is a vein deposit hosted in the Longfellow Limestone. The ore body is tabular, strikes NE and dips 50NW. Ore control was a E-trending fissure vein that follows the main contact between limestone and 200 foot thick porphyry dike. The ore bodies chiefly occur in the limestone and not in the porphyry (Morenci Granite Porphyry). The concentration process was mineralizaton along a fissure vein. Pure kaolin occurs and no sulfide ore is present. Chrysocolla occurs only in kaolin gangue along the contact of porphyry and the sedimentary series.
Area structures include extensive faulting. At the NE end of the tunnel the main fissure appears to break into the porphyry and is complicated by faulting. Normal faulting is confined to pre-Tertiary rocks. Local tectonic features include the Metcalf fault block. The porphyry dike continues from the mine for .25 mile to the NE, where the dike and limestone beds are covered by basalt and rhyolite Tertiary flows. Longfellow Limestone beds dip 10NNW in the vicinity of the mine.
Workings included one tunnel 800 feet long, with extensive open stoping above it; one winze 100 feet deep, sunk from the lower tunnel level. Workings total 243.8 meters long and 30.48 meters deep. Production data included on Longfellow Metcalf Mine data; Longfellow Metcalf also includes the other Arizona Copper Co. Ltd. mines of Detroit, Longfellow, Metcalf, Yavapai, Joy, Humboldt, and Coronado.
References
Lindgren, W. (1905), The copper deposits of the Clifton-Morenci district, Arizona, USGS PP 43: 353.
Stevens, P. (1911) The Copper Handbook: Vol. 10: 356, Arizona Copper Co., Ltd.
Galbraith, F.W. & D.J. Brennan (1959), Minerals of Arizona: 108.
Bennett (1975) Geology and Origin of the Breccias in the Morenci-Metcalf District, Greenlee County, Arizona, MS thesis, University of Arizona, 153 pp.
Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd. ed.: 266.
U.S. Bureau of Land Management Mining District Sheet #837.
U.S. Bureau of Mines - Arizona Bureau of Geology and Mining Technology file data.
MRDS database Dep. ID #10027006, MRDS ID #M001702.
Mineral List
4 entries listed. 4 valid minerals.
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