‡Ref.: Ransome, F.L. (1903) Geology of the Globe Copper District, Arizona, USGS PP 12: 115.
Hewett, D.F. & M. Fleischer (1960), Deposits of the manganese oxides, Economic Geology: 55: 1-55.
Farnham, L.L., Stewart, L.A., and Delong, C.W. (1961), Manganese Deposits of Eastern Arizona, US Bureau of Mines Information Circular 7990: 57.
Peterson, N.P. (1962), Geology and ore deposits of the Globe-Miami district, Arizona, USGS PP 342: 70, 73, 74, 129-131.
Hewett, D.F., et al (1963), Deposits of the manganese oxides: supplemen, Economic Geology.: 58: 1-51.
Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 113, 353.
Arizona Department of Mineral Resources Rambo group file.
MRDS database Dep. ID #10046307, MRDS ID #M241209; and Dep. ID #10160847, MAS ID #0040070565; and Dep. ID 10209506, MAS ID #0040070615.
A former surface and underground Mn-Ag-Cu-Pb-Au-Zn mine located 3½ miles north of Globe and 0.7 miles SE of Ramboz Peak. Discovered by Henry Ramboz in 1875. Produced 1914-1954.
Mineralization is the Ramboz vein with lenses and stringers of ore, hosted inn the Pioneer Formation. It strikes about N.60ºE. and dips vertical to 80ºSE. The principal oreshoot is 300 feet SE of the saddle at the head of Rescue Canyon.
The oreshoot on which the shaft was sunk is said to have been stoped from bottom to surface for about 100 feet along the strike. The stope was from 3 to 4 feet wide.
The vein is a replacement of diabase along a minor fault, and ranges from a mere stringer a fraction of an inch wide to a replaced zone 4 feet wide. The vein is completely oxidized to the depth reached by the shaft. The vein matter, which is mainly quartz and partly replaced diabase containing seams and irregular masses of pyrolusite, manganite, and psilomelane-like minerals. Limonite is generally present but not abundant. The middle part of the vein, where sulfides were most abundant, is a cellular boxwork characteristic of leached sphalerite. The tin siliceous septa are coated with manganese oxides. There are occasional small knots of cerussite and scattered masses of lamellar barite. The iron and manganese oxides generally contain a little copper. A little chlorargyrite was recognized.
A small pocket of sulfide ore cut by the adit may be approximately representative of the hypogene vein matter. It consists of light-colored sphalerite, a little galena, and carbonates, predominantly rhodochrosite and ankerite.
A nearly parallel branch of the main vein crops out about 150 feet to the SE. The outcrop of the branch shows about the same intensity of mineralization as that of the weaker part of the
main vein.
The vein faults probably continue northeastward and intersect a broad fractured zone lying between two nearly parallel faults whose general strike is N.20ºE. These faults and the rock between them are not well exposed at the surface. but evidence of mineralization can be seen in some places. The now inaccessible workings here exposed several mineralized fractures that contain manganese oxides, probably formed by the oxidation of manganese-bearing carbonates. The east fault forms the contact between diabase and a small block of Pinal schist.
About 750 feet SW of the old shaft, the faults extend across a saddle and continue into the head of Big Johnnie Gulch, whence they can be traced southwestward to within 1,000 feet of the NE end of the irene vein fault, which probably is a part of the same fault system.
Area structures include NE and ENE faults. A fault block of Pinal Schist and Madera Diorite is immediately east of the mine. The ENE-trending Ramboz vein fault intersects two parallel N20E-trending faults directly NE of the mine, forming a broad fracture zone, all mineralized. A small outcrop are of the Precambrian Pioneer Formastion is found east of this zone, with a NW strike and 30 degree SW dip.
Workings include an 80 foot deep shaft, sunk on the oreshoot; an adit about 90 feet long, driven southwestward from it's portal in the canyon at a point NE of the shaft; and several shallow pits form the mine workings.
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Map Reference: 33°27'20"N , 110°46'18"W
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