Eldon Mine (Backbone Mine), Eclipse Mine group, Helvetia, Helvetia-Rosemont District, Santa Rita Mts, Pima Co., Arizona, USA
This page is currently not sponsored. Click here to sponsor this page.
Keith, Stanton B. (1974), Arizona Bureau of Geology & Mineral Technology, Geological Survey Branch Bull. 189, Index of Mining Properties in Pima County, Arizona: 125 (Table 4).
Arizona Bureau of Mines file data.
A Cu-Pb-Ag-Au mine located on the unpatented backbone claim, in South-central sec. 24 & North-central sec. 25, T.18S., R.15E. Owned by Steinfeld & Co.
Mineralization is irregular ferruginous gossan zone with copper and lead carbonates underlain locally by disseminated and massive chalcocite and argentiferous galena in pyrometasomatic replacement deposits along the faulted contact of Paleozoic quartzite and silicated limestone in thrust-faulted block segments.
The ore bed was 5 feet wide. Another, low-grade lode was about 100 feet wide.
2 entries listed. 1 valid mineral.
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.