Eisenhower Mine (Eisenhower property/group; Mission Extension; Palo Verde Mine; Palo Verde copper deposit), Mission complex, San Xavier, Pima District (Olive District; Mineral Hill District; Twin Buttes District), Sierrita Mts, Pima Co., Arizona, USA
|Latitude & Longitude (WGS84):||31° 59' 52'' North , 111° 4' 0'' West|
|Latitude & Longitude (decimal):||31.99778,-111.06667|
|Other regions containing this locality:||Sonoran Desert, North America|
Ref.: Mining World (1961) Banner Prepares to Mine Richer Ore as Palo Verde Shaft and Initial Development Nears Completion: November, 1961: 34-35.
Bowman, A.B. (1963) History, growth and development of a small mining company: Mining Engineering: 15(6): 42-49.
MacKenzie, F.D. (1963) Geological interpretation of the Palo Verde mine based upon diamond drill core: Arizona Geological Society Digest: 6: 41-48.
Venable, B.W. (1963) Mining at the Palo Verde Mine, Mining Congress Journal: January, 1963: 49: 14-18.
Gale, R.E. (1965) Geology of the Mission copper mine, Pima mining district, Arizona: Stanford, Stanford University, Ph.D. dissertation, 176 p.
Paydirt (1972), August 28, 1972 (San Xavier Mine).
Keith, Stanton B. (1974), Arizona Bureau of Geology & Mineral Technology, Geological Survey Branch Bull. 189, Index of Mining Properties in Pima County, Arizona: 136 (Table 4).
Builder-Architect-Contractor Engineer Magazine (1976) Eisenhower Mining Company Pumps Life to the Palo Verde Mine: November, 1976: 22-26.
Henrichs, Walter E., Jr. (1976) Pima District, Arizona - A Historical Perspective, A.I.M.E. 105th Annual Meeting, Las Vegas, Nevada, February, 1976, 15 pp.
Paydirt (1976), General Aerial View Helps Explain Rationale for New Eisenhower Joint Venture: December 27, 1976: 1, 3.
World Mining (1976) ANAMAX, ANACONDA, and ASARCO Form New Company: November 1976: 48-49, 77.
Skillings Mining Review (1980), Eidenhower Mining Co. Operations at the Palo Verde Mine: May 24, 1980: 6-12.
Niemuth, N.J. (1981), The Primary Copper Industry of Arizona, in: Arizona Department of Mineral Resources Special Report No. 5: 17.
Arizona Bureau of Mines file data.
MRDS database Dep. ID file #10103751, MRDS ID #M050384; and, Dep. ID #10137748, MRDS ID #D000330, MAS ID #0040190026.
A Cu-Ag-Zn-Pb-Au-Mo mine located in North-central sec. 36, T.16S., R.12E, 7 miles N of Twin Buttes and just N of the Mission and Pima open pits (later incorporated into them). First Produced 1979. Owned at times, or in part, by the Banner Mining Co.; and, American Smelting & Refining Co. (ASARCO).
The Eisenhower property was owned by the Eisenhower Mining Co., in which ASARCO held a 50% interest. That firm started stripping overburden from this deposit in 1976 and started production in 1979. In 1987, ASARCO acquired its partner's 50% interest in this property. As mining progressed this mine lost its identity when it was incorporated into the larger Mission pit and subhumed by it.
Mineralization is copper, zinc, and minor lead sulfides in irregular and spotty high-grade lenses, fracture veinlets, and disseminated in step-faulted and brecciated garnetiferous tactite in Paleozoic limestone and marble, close to Laramide quartz monzonite intrusive and above the San Xavier thrust fault contact with Precambrian granite. Some mineralization, oxide and sulfide, is disseminated in overlying Cretaceous sediments (conglomerate). Ore control was the tactite zone near an intrusive; disseminated in the intrusive. Ore concentration was a 30-70 foot thick oxidation and secondary enrichment zone (chrysocolla, chalcocite, some malachite, and iron oxides). Alteration includes kaolinization, silicification, pyritization and marblization.
Higher grade Cu in the tactite limestone zone. Lower grade disseminations in porphyry and Cretaceous arkose. Molybdenum mainly is disseminations in the porphyry. Supergene sulfides bottom at the 382 foot level. The ore body is contiguous with the Mission and Pima deposits.
Workings included a shaft operation to 335.28 meters deep and underground workings 487.68 meters total length. Production levels at 700, 800, and 900 feet. Some 480,000 tons of ore averaging about 5% Cu, 1 oz. Ag/T and 1% Zn were produced in 1960-1963. The Mission pit subhumed this mine in subsequent operations.
12 valid minerals.
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 Macrostrat.org
|Holocene - Gelasian|
0 - 2.588 Ma
|Quaternary surficial deposits, undivided|
Age: Pleistocene (0 - 2.588 Ma)
Description: Unconsolidated to strongly consolidated alluvial and eolian deposits. This unit includes: coarse, poorly sorted alluvial fan and terrace deposits on middle and upper piedmonts and along large drainages; sand, silt and clay on alluvial plains and playas; and wind-blown sand deposits. (0-2 Ma)
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.