Gold Bar Mine (O'Brien Mine; Little Jim; Jenny Lynn; Interior Mining and Trust Co. Mine; Homestake; Crown; Black Bear), Amazon Wash, Constellation, Black Rock District, Yavapai Co., Arizona, USA
Latitude: 34°5'4"N
Longitude: 112°34'9"W
‡Ref.: USGS Mineral Resources of the US (1907): Part 1: 181.
Arizona Mining Journal (1918) March, 1918: 23.
Arizona Mining Journal (1918) December, 1918: 7.
Wilson, E.D., et al (1934), Arizona Lode Gold Mines and Gold Mining. Arizona Bureau of Mines Bull. 137: 63-64.
Koschmann, A.H. and Bergendahl, M.H. (1968) Principal Gold Producing Districts of the United States. USGS PP 610: 47.
Niemuth, N.J. (1987), Arizona Mineral Development 1984-1986, Arizona Department of Mines & Mineral Resources Directory 29.
Phillips, K.A. (1987), Arizona Industrial Minerals, 2nd. Edition, Arizona Department of Mines & Minerals Mineral Report 4, 185 pp.
Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 206.
USGS Morgan Butte Quadrangle map.
U.S. Bureau of Land Management Mining District Sheet 259 & 260.
Arizona Department of Mineral Resources Gold Bar Mine file.
Arizona Department of Mineral Resources Jenny Lynn file.
MRDS database Dep. ID #10027623, MRDS ID #M003555; and Dep. ID #10137414, MAS ID #0040250778.
A former underground Au-Ag-Cu mine located 15 miles NE of Wickenburg & 2.7 miles NE of Constellation at about 3,400 feet of altitude (outcrop). Started 1888 by J. Mahoney. Subsequently owned by the Saginaw Lumber Co. (circa 1901- ); later, by the Interior Mining & Trust Co. (1907-1908), which mined the orebody from surface to 385 level on the incline; about 1915 the company reorganized into the Gold Bar Mining Co. Claims extend into the SE¼SE¼ of sec. 28, the W½SW¼ sec. 27, and the NW¼ of sec. 34.
Mineralization is a vein deposit principally in a medium-grained granite with some inclusions of schist. It is intruded by pegmatite, granite porphyry and basic dikes. Ore control was faulting, shearing and igneous activity - dikes. Ore concentration was oxidation at near surface. Alteration was minor to none.
The vein outcrops on the West side of O'Brien Gulch & occurs within a fissure zone that strikes N.70ºE. & dips 30ºNW. Its filling consists of coarsely-crystalline, glassy, grayish-white quartz. In places the quartz from the oxidized zone is rather cellular with cavities containing hematite & limonite. Oreshoot was a chimney that measured about 40 feet by 50 feet in cross-section at surface and plunged 30º SW.
Area structures include foliation in Precambrian schist and gneiss that trends N25E to N65E. Veins (and genetically-related [?]) dikes trend N10W to N40W and crosscut Precambrian fabric.
Workings include a vertical shaft to the 700 level (circa 1915). A 10-stamp mill was erected on the property.
Mineral List
5 entries listed. 3 valid minerals.
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