Tom Reed Mine (Blue Ridge Mine; Ben Harrison Mine; Big Jim Aztec Mine; Blue Ridge Gold Mines; Red Cloud Mine), Tom Reed vein, Oatman, Oatman District (San Francisco District; Union Pass District), Black Mts, Mohave Co., Arizona, USA
|Latitude & Longitude (WGS84):||35° 1' 25'' North , 114° 22' 47'' West|
|Latitude & Longitude (decimal):||35.02361,-114.37972|
|Köppen climate type:||BWk : Cold desert climate|
A former underground Au-Ag occurrence/mine located in the NW¼ sec. 23, T19N, R20W, just SE of Oatman, on the Tom Reed vein. Owned by the Gold Road Company; Tom Reed Gold Mines Company (1906- ). Started in 1901. Reopened in 1908 and closed March, 1932.
The Tom Reed deposit occurs in Oatman Andesite and the vein strikes NW-ward and dips steeply NE-ward. Mineralization is a vein deposit. Structure involves NW-trending faults and veins. The Tom Reed vein is offset by the Mallory fault near the Big Jim Mine. The Mallory fault strikes NW but dips 60º to 70º SW. The ore body is lenticular. Pyritized areas are more altered. Bleaching, kaolin, calcite, and chlorite have formed. Ore control involved the vein following the NW-trending fault zone.
Workings include the Tom Reed shaft at 100 feet deep (1933). A 20-stamp mill was erected on site (1904). Production for the period 1908 - 1913 was some $13,053,000 (period values).
Commodity ListThis is a list of exploitable or exploited mineral commodities recorded at this locality.
8 valid minerals.
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
|Tortonian - Bartonian|
7.246 - 41.3 Ma
|Middle Miocene to Oligocene volcanic rocks|
Age: Cenozoic (7.246 - 41.3 Ma)
Description: Lava, tuff, fine-grained intrusive rock, and diverse pyroclastic rocks. These compositionally variable volcanic rocks include basalt, andesite, dacite, and rhyolite. Thick felsic volcanic sequences form prominent cliffs and range fronts in the Black (Mohave County), Superstition, Kofa, Eagletail, Galiuro, and Chiricahua Mountains. This unit includes regionally extensive ash-flow tuffs, such as the Peach Springs tuff of northwestern Arizona and the Apache Leap tuff east of Phoenix. Most volcanic rocks are 20-30 Ma in southeastern Arizona and 15 to 25 Ma in central and western Arizona, but this unit includes some late Eocene rocks near the New Mexico border in east-central Arizona. (11-38 Ma)
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.