- Middle Pass Mining District
| Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 245 Meeves, H.C. (1966), Nonpegmatite beryllium occurrences in AZ, CO, NM, UT and four adjacent states, US Bur. of ines Rept. Inv. 6828. Warner, L.A., et al (1959), Occurrence of non-pegmatite beryllium in the US, USGS PP 318 |
Unnamed Cu-Ag prospect, Middle Pass Mining District, Cochise County, Arizona, USA