Mindat Logo

Dos Cabezas (Two Heads) District, Dos Cabezas Mts, Cochise Co., Arizona, USA

Ref.: The Resources of Arizona - A Manual of Reliable Information Concerning the Territory, compiled by Patrick Hamilton (1881), Prescott, AZ: 40.

Tenney, J.B. (1927-1929) History of Mining in Arizona (unpublished in two volumes), Special Collection, University of Arizona Library & Arizona Bureau of Mines Library: 224-227.

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: 117-121.

Cooper, J.R. (1960) Reconnaissance map of the Willcox, Fisher Hills, Cochise, and Dos Cabezas quadrangles, Cochise and Graham Counties, Arizona: U.S. Geological Survey Mineral Investigations Field Studies Map MF-231, 1 sheet, scale 1:62,500.

Keith, Stanton B. (1973), Arizona Bureau of Geology Bull. 187: 8-9, 60.

A Au-Ag-Cu-Pb-Zn-Be-W mining area located in T14-15S, R27-28E, on the southern flank of the Dos Cabezas (Two Heads) Mountains in central Cochise County, Arizona. Production from the beginning (about 1878) to 1970 totaled some 2,000 tons of Cu, 700 tons Pb, 19 tons Zn, 430,000 ounces Ag and 10,000 ounces Au.

The formations in this district outcrop in westward-trending belts with Pre-Cambrian granite on the South, succeeded northward by steeply dipping, metamorphosed Cretaceous shales and sandstones and Carboniferous limestones. These rocks are intruded by dikes of rhyolite-porphyry and diabase. The thrust fault zone that separates the Cretaceous strata from the granite contains a vein of coarse-grained white quartz, called the "Big Ledge," that attains a maximum width of 100 feet but locally branches and pinches out.

The gold-bearing veins consist of coarse-textured, white to grayish-white quartz with scattered small bunches and disseminations of sulfides. Gold occurs within the sulfides. The veins occur both in the Cretaceous rocks and associated with diabase dikes in the granite. They are of the mesothermal type, but tend to be of lenticular form, particularly in the shales. Their walls show silicification. The shales adjacent to the veins contain pyrite metacrysts and abundant graphite.

Mineral List

Mineral list contains entries from the region specified including sub-localities
Acanthite
Anglesite
Azurite
Bismutite
Bornite
Calcite
Cerussite
Chalcanthite
Chalcocite
Chalcopyrite
var: Auriferous Chalcopyrite
'Chlorite Group'
Clinobisvanite
Covellite
Epidote
Galena
var: Argentiferous Galena
'Garnet'
Gladite
Goethite
Gold
var: Electrum
Graphite
Gypsum
Hematite
Jarosite
'Limonite'
Magnetite
Malachite
Mottramite
var: Duhamelite

Muscovite
Nontronite
Opal
Pekoite
Pyrite
var: Auriferous Pyrite
Pyrolusite
Quartz
Scheelite
Siderite
Silver
Sphalerite
Sternbergite
Talc
Topaz
Uytenbogaardtite
'Wad'


50 entries listed. 38 valid minerals.

Localities in this Region

USA
USA

The above list contains all mineral locality references listed on mindat.org. 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 mindat.org 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.
This page is currently not sponsored. To sponsor this page click here.


Mineral and/or Locality  
Search Google  
Copyright © Jolyon Ralph and Ida Chau 1993-2014. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of thousands of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
Current server date and time: October 24, 2014 16:54:01 Page generated: August 15, 2013 21:14:18
Mineral and Locality Search
Mineral:
and/or Locality:
Options
Fade toolbar when not in focusFix toolbar to bottom of page
Hide Social Media Links
Slideshow frame delay seconds