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Swallow Mine (Moonlight Mine; Dobler Mine; Whim vein; Golden Wonder shaft), Buzzard's Roost, Copperopolis, Castle Creek District, Bradshaw Mts (Bradshaw Range), Yavapai Co., Arizona, USA

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Latitude & Longitude (WGS84): 34° 3' 25'' North , 112° 30' 29'' West
Latitude & Longitude (decimal): 34.05695,-112.50806


‡Ref.: Report to the Governor of Arizona (1899): 102.

Lindgren, W. (1926), Ore deposits of the Jerome and Bradshaw Mountains quadrangles, Arizona, USGS Bull. 782: 25, 28, Plate 15, 184-185.

Wilson, E.D., et al (1934), Arizona lode gold mines and gold mining, Arizona Bureau of Mines Bull. 137: 62.

Galbraith, F.W. (1947), Minerals of Arizona, Arizona Bureau of Mines Bull. 153: 22.

Galbraith, F.W. & D.J. Brennan (1959), Minerals of Arizona: 33, 44.

Van Alstine, R.E. and Moore, R.T. (1969) Fluorspar, in USGS & Arizona Bureau of Mines & U.S. Bureau of Reclamation, Mineral and Water Resources of Arizona, Arizona Bureau of Mines Bull. 180 (USGS Bull.871): 354.

Elevatorski, E.A. (1971), Arizona Fluorspar, Arizona Department of Mineral Resources, U.S. Bureau of Mines Report of Investigation 5651: 38.

Elevatorski, E.A. (1978), Arizona Industrial Minerals, Arizona Department of Mineral Resources, Minerals Report No. 2.

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

Peirce, H. Wesley (1990), Arizona Geological Survey Industrial Minerals card file.

Niemuth, N.J. & K.A. Phillips (1992), Copper Oxide Resources, Arizona Department of Mines & Mineral Resources Open File Rept. 92-10: 17 (Table 1).

Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 138, 139.

U.S. Bureau of Mines - Arizona Bureau of Geology and Mining Technology file data.

Arizona Department of Mineral Resources Swallow Mine file.

USGS Morgan Butte Quadrangle map.

U.S. Bureau of Land Management Arizona Mining Claims Lead File #26727.

MRDS database Dep. ID #10048155, MRDS ID #M800203; and, Dep. ID #10162216, MAS ID #0040251827.

A former surface and underground Cu-Au-Ag-Fluorspar mine located in the W¼ sec. 6, T.8N., R.2W. (Morgan Butte 7.5 minute topo map), near Copperopolis at 3,225 feet of altitude. Owned by John Dobler (1926). Discovered in 1890 by Mr. Dobler. Produced 1910-1966. Claims extend into sec. 7, T8N, R2W and secs. 1 & 12, T8N, R3W.

Mineralization is a post-Tertiary Au-Cu vein with a tabular ore body. Country rock is Bradshaw Granite with dikes of andesite and granite porphyry. The vein strikes N.10ºW. and dips 70ºE. The ore averages 3 to 15 feet wide. A second vein strikes N.33ºW. and dips 60ºE. Ore control was faulting and shearing. Ore concentration was oxidtion at near surface. Alteration was minor Fe-staining.

Area structures include veins parallel to low-angle (less than 50 degrees dip) faults which trend NW. Foliation in Precambriqan schist trends N20E to N50E. Tertiary volcanics dip NE and strike NW.

Workings include the south shaft at 225 feet deep (½ mile SE of Buzzard's Roost), and a second shaft at 300 feet deep located north of the house and 300 feet above it. A 10-stamp mill was erected. Produced 1 to 2 oz. Au/T.

Mineral List


10 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

Statherian
1600 - 1800 Ma
Early Proterozoic granitic rocks

Age: Statherian (1600 - 1800 Ma)

Description: Wide variety of granitic rocks, including granite, granodiorite, tonalite, quartz diorite, diorite, and gabbro. These rocks commonly are characterized by steep, northeast-striking foliation. (1600-1800 Ma)

Comments: ~ 1.6 - 1.8 Ga

Lithology: Major:{granite,granodiorite,tonalite}, Minor:{quartz diorite,diorite,gabbro}

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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