Copper World Mine

Mining District and Mines

Helvetia District .⁶

Aka: Black horse shaft.⁷

Plan of 400 foot level

Location

18S 15E SW¼ 15 NW¼ 24⁷

31.44889,-110.78444²

Companies

Helvetia Copper Co., Michigan-Development Co., Helvetia Copper Co. of Arizona, Blankenship, Santa Rita Mng. Co.⁷

Mineral Products

Cu, Ag, Au, W-⁷

Geology

Chalcopyrite with minor chalcocite; copper carbonates, oxides and sulphates; and some spotty disseminated scheelite and molybdenite along fractures, in irregular pyrometasomatic replacements, and disseminated, in silicated and locally pyritized Pennsylvania limestone and underlying Cambrian quartzites along a strong fracture zone accompanying a thrust fault plane.⁷

Creasey and Quick, plate 30⁸

Type of Operation and Production

Shaft workings. A major producer, mainly from 1899 to 1916, with some 42,000 tons of ore averaging better than 5% Cu, about 1 oz. Ag/T, and minor Au.⁷

Photos

References

1. Index of Mining Properties in Santa Cruz County, Arizona, by Staton B. Keith, Bulletin 191, Arizona Geological Survey, 1975.
2. Mindat.org - small amount of data
3. MRDS records: 31.44904, -110.78538
4. History of Mining in Arizona, J. Michael Canty and Michael L. Greeley (eds.), Mining Club of the Southwest Foundation, 1987
5. Arizona Department of Mines report: http://docs.azgs.az.gov/OnlineAccessMineFiles/A-B/BilliedSantacruz65.pdf
6. The Mineral Deposits of the Santa Rita and Patagonia Mountains by Frank C. Schrader, 1914
7. Index of Mining Properties in Pima County, Arizona, by Staton B. Keith, Bulletin 189, Arizona Geological Survey, 1975.
8. Copper Deposits of Part of Helvetia Mining District, Pima County, Arizona by S. C. Creasey and George L. Quick, Gelogical Survey Bulletin 1027-F, 1955