|Latitude & Longitude (WGS84):||31° 41' 39'' North , 111° 19' 13'' West|
|Latitude & Longitude (decimal):||31.69417,-111.32028|
|Other regions containing this locality:||Sonoran Desert, North America|
|Köppen climate type:||BSk : Cold semi-arid (steppe) climate|
‡Ref.: Copper Handbook (1903).
Stevens, P. (1908) The Copper Handbook, Vol. VIII.
Keith, Stanton B. (1974), Arizona Bureau of Geology & Mineral Technology, Geological Survey Branch Bull. 189, Index of Mining Properties in Pima County, Arizona: 114 (Table 4).
Arizona Bureau of Mines file data.
MRDS database Dep. ID file #10026917, MRDS ID #M001055; and, Dep. ID #10283556, AS ID #0040190288.
A former small surface and underground Ag-Au-Pb-Cu mine located in the NE ¼ sec. 16, T.20S., R.10E., 8½ miles N of Arivaca. Owned by the Liberty Mining & Smelting Co.
Mineralization is irregular quartz-fissure vein with spotty, oxidized, argentiferous galena and minor gold and copper minerals.
Workings include shaft and pit operations. Operated sporadically fom the mid-1800's to the early 1900's, producing some 100 tons of ore averaging about 80 oz. Ag/T, 0.5 oz. Au/T and minor Pb & Cu.
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
|Quaternary - Miocene|
0 - 23.03 Ma
|Cenozoic sedimentary rocks|
Age: Cenozoic (0 - 23.03 Ma)
Lithology: Sedimentary rocks
Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. 
|Langhian - Priabonian|
13.82 - 37.8 Ma
|Middle Miocene to Oligocene shallow intrusions|
Age: Cenozoic (13.82 - 37.8 Ma)
Description: Generally very fine-grained, porphyritic rhyolite to dacite in small, irregular-shaped bodies formed as subvolcanic intrusions in volcanic fields of southern and western Arizona, or in concentrated zones of dikes in the Mohave and Black Mountains of northwestern Arizona. The unit consists of mafic tuff, breccia and shallow intrusions at Buell Park in northeastern Arizona. (14-35 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.