Black Pearl Mine (Black Pearl group of claims; Camp Wood Tungsten Mine), Loco Gulch, Eureka District, Yavapai Co., Arizona, USA

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‡Ref.: Wilson, E.D. (1941), Tungsten Deposits of Arizona. Arizona Bureau of Mines Bull. 148: 21-22.

Anderson, C.A. (1955) Geology and Ore Deposits of the Bagdad Area, Yavapai County, Arizona. USGS PP 278.

Brownell, G.M. (1959), A beryllium detector for field exploration, Econ.Geol.: 54: 1103-1114;

Galbraith, F.W. & D.J. Brennan (1959), Minerals of Arizona: 80.

Dale, V.B. (1961), Tungsten deposits of Gila, Yavapai, and Mohave Counties, Arizona, U.S. Bureau of Mines Information Circular 8078: 43.

Lemmon, D.M., and Tweto, O.L. (1962) Tungsten in the U.S., USGS map, MR-25.

Staatz, M.H., et al (1965), Differences in the minor element composition of beryl in various environments, American Mineralogist: 50: 1783.

Meeves, H., et al (1966), Reconnaissance of beryllium-bearing pegmatite deposits in six western states, U.S. Bureau of Mines Information Circular 8298: 21 (Table A-1).

Phillips, K.A. (1987), Arizona Industrial Minerals, 2nd. Edition, Arizona Department of Mines & Minerals Mineral Report 4, 185 pp.

Sawyer, M.B., Gurmendi, A.C., Daley, M.R., and Howell, S.B. (1992) Principal Deposits of Strategic and Critical Minerals in Arizona, U.S. Bureau of Mines Special Publication, 334 pp.

Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 134, 139, 424.

Flagg, A.L., Vanadium Report, Book VI (unpublished).

Lemmon, D.M., unpublished data.

USGS Bagdad Quadrangle map.

Arizona Department of Mineral Resources Black Pearl file.

MRDS database Dep. ID #10027556, MRDS ID #M003351; and, Dep. ID #10161782, MAS ID #0040250233.

A former underground W-Bi-Au-Ag-Mo-Cu-Be-Fluorspar-Quartz mine on 11 patented and 5 unpatented claims in secs. 7, 8 & 18, T.15N., R.7W. & secs. 12 & 13, T.15N., R.8W., approximately 600 feet East of Boulder Creek on the South side of Loco Gulch, 15 miles SW of Camp Wood. Discovered in 1914 by Mr. Wm. Conners, then owned by John Lawler & Homer R. Wood. Produced 1915-1935 & 1951-1956.

Mineralization is a vein deposit with tabular ore bodies en echelon. Dark gray hornblende granite is invaded by pegmatites and crops out beneath Tertiary lava flows. Ore control was faulting. Alteration was oxidation to at least 40 feet below the outcrop.

The principal vein strikes S.74ºE. and dips steeply SW. It is a quartz body 6,000 feet long, 3 feet wide, and 250 feet deep, in granite. Average width of the vein exposed is 4.2 feet. The wall rock is intensely altered to sericite. Gangue is coarsely crystalline grayish-white quartz.

Workings include stopes opened from short adits and shallow shafts with maximum depth of 70 feet below the outcrop. Longest adit is 1,565 feet (Veta adit), with 5 raises to surface, a 155 foot shaft with 700 feet of drifting and 3 stopes. Production was 62,100 pounds of average 70.0% WO3 (1915-1935).

Mineral List

Beryl Biotite Bismuthinite Chalcopyrite

Fluorite Gold Hematite var: Specularite 'Hornblende'

Molybdenite Muscovite var: Sericite Orthoclase

Pyrite Scheelite Silver Wolframite

16 entries listed. 11 valid minerals.