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Liberty Mine, Cerro Colorado District, Cerro Colorado Mts, Pima Co., Arizona, USA

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Latitude & Longitude (WGS84): 31° 41' 39'' North , 111° 19' 13'' West
Latitude & Longitude (decimal): 31.69417,-111.32028
GeoHash:G#: 9t8u6cepc
Other regions containing this locality:Sonoran Desert, North America
Locality type:Mine
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.

Mineral List

1 valid mineral.

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

Quaternary - Miocene
0 - 23.03 Ma

ID: 3185380
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. [154]

Langhian - Priabonian
13.82 - 37.8 Ma

ID: 2766794
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)

Comments: Includes Navajo volcanic field minettes

Lithology: Major:{hypabyssal dacite,mafic volcanic,hypabyssal rhyolite}

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, used under Creative Commons Attribution 4.0 License

This page contains all mineral locality references listed on This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.
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