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Pomona Mine (Pomono Mine; Emerald Mine; James Mine; Black Eagle Mine; James group of claims; James property), Brown Canyon, Hartford District (Huachuca Mountains District), Huachuca Mts, Cochise Co., Arizona, USA

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Latitude & Longitude (WGS84): 31° 27' 15'' North , 110° 19' 54'' West
Latitude & Longitude (decimal): 31.4541666667, -110.331666667
Other regions containing this locality:Sonoran Desert, North America


‡Ref.: Wilson, E.D. (1941), Tungsten deposits of Arizona, Arizona Bureau of Mines Bull. 148: 47.

Weber, R.H. (1950), The Geology of the East-central Portion of the Huachuca Mountains, Arizona, University of Arizona, PhD. Thesis: 150-156.

Wilson, E.D., et al (1951), Arizona zinc and lead deposits, part II, Arizona Bureau of Mines Bull. 158: 40, 47.

Galbraith, F.W. & D.J. Brennan (1959), Minerals of Arizona: 81.

Dale, V.B., Stewart, L.A., and McKinney, W.A. (1960), Tungsten deposits of Cochise, Pima, and Santa Cruz Counties., Arizona, U.S. Bureau of Mines Report of Investigation 5650: 32-33.

Keith, Stanton B. (1973), Arizona Bureau of Geology & Mineral Technology, Geol. Sur. Branch Bull. 187, Index of Mining Properties in Cochise County, Arizona: 66 (Table 4).

Ludington, S. (1984) Preliminary mineral-resource assessment of the proposed Miller Peak Wilderness, Cochise County, Arizona: U.S. Geological Survey Open-File Report 84-0293, 10 p.: 3-4.

Niemuth, N.J. & K.A. Phillips (1992), Copper Oxide Resources, Arizona Department of Mines & Mineral Resources Open File Report 92-10: 5 (Table 1).

Tuftin, S.E. and Armstrong, R.C. (1994) U.S. Bureau of Mines Open File Report Mineral Land Assessment (MLA) 1-94.

Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd. ed.: 362.

Dunning, Charles H., Arizona Department of Mineral Resources James Mine group file, personal communication.

Yale Peabody GNIS database (NOTE: this database is derived from USGS 1:24,000 topographic map data).

MRDS database Dep. ID file #10109616, MRDS ID #M050512; and, Dep. ID #10234033, MAS ID #0040030198.

A former small W-Pb-Cu-Zn-Ag-Au mine located on 3 unpatented claims in South-central sec. 5 & North-central sec. 8, T.23S., R.20E. (Miller Peak 7.5 minute topo map), upper Brown Canyon, near crest of the range (7,200 feet of altitude) and adjacent to the Fort Huachuca military reservation. Produced 1918, 1945-1947. Owned at times, or in part, by the Pomona Mining Co.; Huachuca Mining and Milling Co.; Sierra Vista Mining Co.; J. Kelley & Associates (WWI); H.S. James (1927- ); and, by the Border-Land Metals Co.

Mineralization is scheelite and oxidized base metal sulfides in a quartz vein and in pockets in deformed and thrust faulted Cambrian Abrigo and Devonian Martin limestone (lower Paleozoic) beds. The principal vein crops out for a length of about 150 feet with a width of 1½ to 10 feet, a N40W strike, and a dip of 45ºSW to almost flat. Oreshoots to 5 feet thick and more than 10 feet long appear to occur at intersections of NW & northly fissures. Ore consists of coarsely crystalline grayish-white quartz with tungsten mineralization.

Workings include a 200 foot long adit with several stopes and drifts. This mine produced 450 tons of tungsten ore in 1918 and intermittently some 120 tons from 1945 to 1963. Some base metal sulfides were produced as a by-product.

Mineral List


8 valid minerals.

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org

Serpukhovian - Early Cambrian
323.2 - 541 Ma
Mississippian, Devonian, and Cambrian sedimentary rocks

Age: Paleozoic (323.2 - 541 Ma)

Stratigraphic Name: Tapeats Sandstone; Bright Angel Shale; Muav Limestone; Temple Butte Formation; Redwall Limestone; Bolsa Quartzite; Abrigo Formation; Martin Formation; Escabrosa Limestone

Description: Brown to dark gray sandstone grades upward into green and gray shale, overlain by light to medium gray or tan limestone and dolostone. This unit includes the Tapeats Sandstone, Bright Angel Shale, Muav Limestone, Temple Butte Formation and Redwall Limestone in northern Arizona, and the Bolsa Quartzite, Abrigo Formation, Martin Formation, and Escabrosa Limestone in southern Arizona. These rocks record intermittent sea-level rise and inundation in early Paleozoic time. (330-540 Ma)

Lithology: Major:{sandstone,shale,limestone}, Minor:{dolostone,quartzite}

Reference: Horton, J.D., C.A. San Juan, and D.B. Stoeser. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States. doi: 10.3133/ds1052. U.S. Geological Survey Data Series 1052. [133]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License



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