Golden Aster Mine (Lehman Mine; Lehman property; Rattlesnake vein), Copperopolis, Castle Creek District, Bradshaw Mts (Bradshaw Range), Yavapai Co., Arizona, USA
|Latitude & Longitude (WGS84):||34° 5' 40'' North , 112° 27' 18'' West|
|Latitude & Longitude (decimal):||34.09444,-112.45500|
‡Ref.: Lindgren, W. (1926), Ore deposits of the Jerome and Bradshaw Mountains quadrangles, Arizona, USGS Bull. 782: 187.
Wilson, E.D., Cunningham, J.B., and Butler, G.M. (1934), Arizona Lode Gold Mines and Gold Mining (revised 1967), Arizona Bureau of Mines Bull. 137: 62.
Arizona Department of Mineral Resources Golden Aster Mines file.
USGS Copperopolis Quadrangle map.
MRDS database Dep. ID #10048154, MRDS ID #M800201; and, Dep. ID #10186658, MAS ID #0040250804.
A former underground Au-Ag-Cu mine located about 1 1/8 miles North of Copperopolis at 4,200 feet of altitude. Started 1932 and closed 1933. Discovered and owned by Gus Lehman, later acquired by E.C. Champie.
Mineralization is a vein deposit with a tabular ore body. Granite prevails with some inclusions of schist and pegmatite dikes. The deposit consists of closely-spaced, parallel, branching veins that strike N.10ºW. and dip 25ºW., and vary in width from a few inches to 2 feet. Filling is massive, glassy quartz with limonite & a little tourmaline. Ore control was faulting and shearing. Ore concentration was oxidation at near surface. Alteration was minor Fe-staining.
Area structures include veins parallel to low-angle (less than 50 degree dip) faults which trend NW. Foliation in Precambrian schist trends N20E to N50E. Tertiary volcanics dip NE and strike NW.
Workings include about 1,000 feet of tunnels and raises.
1 valid mineral.
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
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
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.