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Aztec Mine (Aztec group of claims; Aztec Mine group; Andes group), Aztec Gulch, Alum Gulch, Harshaw Mining District, Patagonia Mountains, Santa Cruz Co., Arizona, USAi
Regional Level Types
Aztec Mine (Aztec group of claims; Aztec Mine group; Andes group)Mine
Aztec GulchGulch
Alum GulchGulch
Harshaw Mining DistrictMining District
Patagonia MountainsMountain Range
Santa Cruz Co.County
ArizonaState
USACountry

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Key
Latitude & Longitude (WGS84):
31° 30' 36'' North , 110° 44' 54'' West
Latitude & Longitude (decimal):
Locality type:
Nearest Settlements:
PlacePopulationDistance
Patagonia890 (2017)3.4km
Kino Springs136 (2011)17.3km
Beyerville177 (2011)18.1km
Sonoita818 (2015)20.7km
Rio Rico18,962 (2011)22.0km


‡Ref.: Schrader, F.C. & J.M. Hill (1915), Mineral deposits of the Santa Rita and Patagonia Mountains, Arizona, USGS Bull. 582: 263-264.

Tenney, J.B. (1927-1929) History of Mining in Arizona, Special Collection, University of Arizona Library & Arizona Bureau of Mines Library: 313.

Moores, R.C., III (1972) The geology and ore deposits of a portion of the Harshaw district, Santa Cruz County, Arizona: Tucson, University of Arizona, M.S. thesis, 98 p.

Simons, F.S. (1972) Mesozoic stratigraphy of the Patagonia Mountains and adjoining areas, Santa Cruz County, Arizona, in Mesozoic stratigraphy in southeastern Arizona: U.S. Geological Survey Professional Paper 658-E: E22.

Keith, Stanton B. (1975), Arizona Bureau of Mines Bull. 191, Index of Mining Properties in Santa Cruz County Arizona: 56 (Table 4).

Niemuth, N.J. & K.A. Phillips (1992), Copper Oxide Resources, Arizona Department of Mines & Mineral Resources Open File Report 92-10: 16 (Table 1).

U.S. Bureau of Mines files, Aztec Mine group.

Arizona Bureau of Mines file data.

MRDS database Dep. ID file #10048354, MRDS ID #M899945; and, Dep. ID #10161874, MAS ID #0040230033.

A former small surface and underground Cu-Ag-Pb-Au-Zn mine located on 24 claims in North-central sec. 19, T.22S., R.16E. (Elgin 15 minute topo map), 2 miles south of Patagonia, in the NW slope of Red Mountain, in the upper part of Aztec Gulch, a NE tributary of Alum Gulch, at an elevation of about 4,850 feet, on National Forest land. Discovered in 1925 by R.R. Richardson and Associates. First produced in 1916. Owned by R.R. Richardson (early 1900's), of Patagonia. Other operators/owners included Sanders and Harrison; and, Mr. Ed Bollinger. The Andes Mine of the Aztec Mine group is located on the Andes vein.

Mineralization is disseminated and small banded lenses of copper carbonates and sulfides in a strongly sericitized fracture zone in Cretaceous-Tertiary Laramide rhyolite, enriched in places by a system of cross fractures. Ore concentration included the secondary replacement of rhyolite by small, irregular deposits of ore. Surface oxidation exists to unknown depths. The ore zone is 609.6 meters long, 15.24 meters wide, strikes N-S and dips 75SE.

Local rock is a large area of mineralized or partly mineralized rhyolite which is medium- to coarse-grained, partly porphyritic, and in places crudely and dimly banded and bedded.

The principal exposures are in the southern part of the group on claims Nos. 8 & 11. Here the rhyolite is more or less heavily impregnated with pyrite and chalcopyrite and is coated with chalcocite, bornite and malachite. The latter minerals are particularly concentrated as secondary replacement deposits in a 12 foot lode or ore bed which dips 75ºSE, and is reported to have an extent of 2,000 feet, mostly to the northeast of the main opening.

In places the openings reveal the deposit to be at least 50 feet in width and to have a horizontal extent of more than 100 feet. Some of the ore is banded or consists of shoots of relatively pure secondary chalcocite and chalcopyrite 1 inch (2.5 cm) in maximum width and containing inclusions of orthoclase and quartz of the replaced rhyolite. Nearly everywhere the ore minerals are surrounded by a fringe (rim) of muscovite, or are embedded in a mass of it, and the feldspar and quartz show a tendency to a radial arrangement around the ore.

Local structures include E-W and N-S-trending faults. Thick-bedded, very fine-grained volcanics are associated with Red Mountain.

Tectonic elements include the Red Mountain Fault Block with downthrow to the north.

Workings include a 1,500 foot tunnel, a 90 foot inclined shaft and a 30 foot open cut plus 600 feet of drifts, crosscuts and raises. Workings total 676.66 meters in length and 182.88 meters in depth. A few tens of tons of 7% Cu (+ 5 oz/ton Ag) ore were produced in the early 1900's.

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


7 valid minerals.

Detailed Mineral List:

Bornite
Formula: Cu5FeS4
Reference: Keith, Stanton B. (1975), Arizona Bureau of Mines Bull. 191, Index of Mining Properties in Santa Cruz County Arizona: 56 (Table 4); Schrader, F.C. & J.M. Hill (1915), Mineral deposits of the Santa Rita and Patagonia Mountains, Arizona, USGS Bull. 582: 264; Arizona Bureau of Mines file data.
Chalcocite
Formula: Cu2S
Reference: Keith, Stanton B. (1975), Arizona Bureau of Mines Bull. 191, Index of Mining Properties in Santa Cruz County Arizona: 56 (Table 4); Schrader, F.C. & J.M. Hill (1915), Mineral deposits of the Santa Rita and Patagonia Mountains, Arizona, USGS Bull. 582: 264; Arizona Bureau of Mines file data.
Chalcopyrite
Formula: CuFeS2
Reference: Keith, Stanton B. (1975), Arizona Bureau of Mines Bull. 191, Index of Mining Properties in Santa Cruz County Arizona: 56 (Table 4); Schrader, F.C. & J.M. Hill (1915), Mineral deposits of the Santa Rita and Patagonia Mountains, Arizona, USGS Bull. 582: 264; Arizona Bureau of Mines file data.
'Feldspar Group'
Reference: MRDS database Dep. ID file #10048354, MRDS ID #M899945.
'Limonite'
Formula: (Fe,O,OH,H2O)
Reference: MRDS database Dep. ID file #10048354, MRDS ID #M899945.
Malachite
Formula: Cu2(CO3)(OH)2
Reference: Schrader, F.C. & J.M. Hill (1915), Mineral deposits of the Santa Rita and Patagonia Mountains, Arizona, USGS Bull. 582: 264.
Muscovite
Formula: KAl2(AlSi3O10)(OH)2
Description: As rims surrounding ore minerals or as masses enclosing the ore minerals.
Reference: Schrader, F.C. & J.M. Hill (1915), Mineral deposits of the Santa Rita and Patagonia Mountains, Arizona, USGS Bull. 582: 264.
Muscovite var: Sericite
Formula: KAl2(AlSi3O10)(OH)2
Reference: MRDS database Dep. ID file #10048354, MRDS ID #M899945.
Pyrite
Formula: FeS2
Reference: Keith, Stanton B. (1975), Arizona Bureau of Mines Bull. 191, Index of Mining Properties in Santa Cruz County Arizona: 56 (Table 4); Schrader, F.C. & J.M. Hill (1915), Mineral deposits of the Santa Rita and Patagonia Mountains, Arizona, USGS Bull. 582: 264; Arizona Bureau of Mines file data.
Tridymite
Formula: SiO2
Description: Microscopic component of ore.
Reference: Schrader, F.C. & J.M. Hill (1915), Mineral deposits of the Santa Rita and Patagonia Mountains, Arizona, USGS Bull. 582: 264.

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
Bornite2.BA.15Cu5FeS4
Chalcocite2.BA.05Cu2S
Chalcopyrite2.CB.10aCuFeS2
Pyrite2.EB.05aFeS2
Group 4 - Oxides and Hydroxides
Tridymite4.DA.10SiO2
Group 5 - Nitrates and Carbonates
Malachite5.BA.10Cu2(CO3)(OH)2
Group 9 - Silicates
Muscovite9.EC.15KAl2(AlSi3O10)(OH)2
var: Sericite9.EC.15KAl2(AlSi3O10)(OH)2
Unclassified Minerals, Rocks, etc.
'Feldspar Group'-
'Limonite'-(Fe,O,OH,H2O)

List of minerals arranged by Dana 8th Edition classification

Group 2 - SULFIDES
AmBnXp, with (m+n):p = 2:1
Chalcocite2.4.7.1Cu2S
AmBnXp, with (m+n):p = 3:2
Bornite2.5.2.1Cu5FeS4
AmBnXp, with (m+n):p = 1:1
Chalcopyrite2.9.1.1CuFeS2
AmBnXp, with (m+n):p = 1:2
Pyrite2.12.1.1FeS2
Group 16a - ANHYDROUS CARBONATES CONTAINING HYDROXYL OR HALOGEN
Malachite16a.3.1.1Cu2(CO3)(OH)2
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 2:1 layers
Muscovite71.2.2a.1KAl2(AlSi3O10)(OH)2
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Tridymite75.1.2.1SiO2
Unclassified Minerals, Mixtures, etc.
'Feldspar Group'-
'Limonite'-(Fe,O,OH,H2O)
Muscovite
var: Sericite
-KAl2(AlSi3O10)(OH)2

List of minerals for each chemical element

HHydrogen
H MalachiteCu2(CO3)(OH)2
H MuscoviteKAl2(AlSi3O10)(OH)2
H Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
H Limonite(Fe,O,OH,H2O)
CCarbon
C MalachiteCu2(CO3)(OH)2
OOxygen
O MalachiteCu2(CO3)(OH)2
O MuscoviteKAl2(AlSi3O10)(OH)2
O TridymiteSiO2
O Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
O Limonite(Fe,O,OH,H2O)
AlAluminium
Al MuscoviteKAl2(AlSi3O10)(OH)2
Al Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
SiSilicon
Si MuscoviteKAl2(AlSi3O10)(OH)2
Si TridymiteSiO2
Si Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
SSulfur
S ChalcociteCu2S
S PyriteFeS2
S ChalcopyriteCuFeS2
S BorniteCu5FeS4
KPotassium
K MuscoviteKAl2(AlSi3O10)(OH)2
K Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
FeIron
Fe PyriteFeS2
Fe ChalcopyriteCuFeS2
Fe BorniteCu5FeS4
Fe Limonite(Fe,O,OH,H2O)
CuCopper
Cu ChalcociteCu2S
Cu ChalcopyriteCuFeS2
Cu BorniteCu5FeS4
Cu MalachiteCu2(CO3)(OH)2

Other Databases

USGS MRDS Record:10048354

Other Regions, Features and Areas containing this locality

North America
North America PlateTectonic Plate

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