Table Mountain Mine, Table Mountain area, Table Mountain District, Galiuro Mts, Pinal Co., Arizona, USA
|Latitude & Longitude (WGS84):||32° 49' 1'' North , 110° 29' 11'' West|
|Latitude & Longitude (decimal):||32.81694,-110.48639|
|Other regions containing this locality:||Sonoran Desert, North America|
|Köppen climate type:||BSk : Cold semi-arid (steppe) climate|
A former underground Cu-Ag-Au-Pb-Zn-Mo-V-Ba(Baryte) mine located on 12 patented claims, in the SE¼ sec. 15, and the NE¼ sec. 22, T7S, R18E (Oak Grove Canyon 7.5 minute topo map), near Sycamore Canyon, about 1¼ miles SE of Table Mountain, 1¼ miles NNE of Little Table Mountain, and about 4½ miles N of Copper Creek ghost town, on BLM-administered land. Discovered in the late 1870's and first prospected for Au. Owned by Mollie Morgan, Evelyn Sandstrom, Mattie Young, and Marion Gills (1964).
Mineralization is a vein deposit hosted in Escabrosa Limestone, agglomerate and andesite. The orebodies are tabular, sporadic and irregular pods at 30.48 meters thick. Ore control was a jasperoid breccia layer up to 100 feet thick containing ore, fault and joint surfaces. Area structure is vertical fault zones in limestone with NNW-trending block faulting.(MRDS). Some veins are along fractures. Escabrosa Limestone is unconformably overlain by Galiuro Volcanics. Oxidation probably preceeded andesite flows. This deposit may be an exotic/secondarily derived deposit from erosion of nearby deposits.
Development included about 2,000 feet (609 meters) of underground workings achieving a depth of 12.19 meters. The cliff-forming unit has been developed by 6 adits ranging up to 700 feet in length. The principal workings are on the east side of the north-trending ridge. One of the adits encountered caverns in the limestone which were reportedly lined with crystals of wulfenite and vanadinite. The most common ore mineral found was chrysocolla, along with malachite, azurite, dioptase, and free-milling gold. No sulfides are present. (Heylmun, 1998).
Workings incude adits and drifts. The main adit is caved 200 feet from the portal.
Assay data: Ore on the dump assayed 2-3% Cu, 0.5-0.6 oz/t Ag, 0.14-0.15 oz/t Au. Sorted chrysocolla averages 20-25% Cu. Slag assayed 2.4% Cu & 0.02 oz/t Au. The vein in the adit assayed 3-4% Pb, 1-2% vanadic oxide, 2-3 oz/t Ag and $5-18/t Au (period prices).
16 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.