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Exposed Reef Mines (Saint Louis Mine), Blue Eagle and Exposed Reef group, Alum Gulch, Harshaw Mining District, Patagonia Mountains, Santa Cruz Co., Arizona, USAi
Regional Level Types
Exposed Reef Mines (Saint Louis Mine)Group of Mines
Blue Eagle and Exposed Reef group- not defined -
Alum GulchGulch
Harshaw Mining DistrictMining District
Patagonia MountainsMountain Range
Santa Cruz Co.County
ArizonaState
USACountry

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Key
Latitude & Longitude (WGS84):
31° 29' 39'' North , 110° 44' 53'' West
Latitude & Longitude (decimal):
Locality type:
Group of Mines
Nearest Settlements:
PlacePopulationDistance
Patagonia890 (2017)5.1km
Kino Springs136 (2011)15.7km
Beyerville177 (2011)16.9km
Rio Rico18,962 (2011)21.8km
Sonoita818 (2015)22.3km


Ref.: Schrader, F.C. & J.M. Hill (1915), Mineral deposits of the Santa Rita and Patagonia Mountains, Arizona, USGS Bull. 582: 257-258.

Elsing, M.J. (1921) Report.

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.

Simons, F.S. (1974) Geologic map and sections of the Nogales and Lochiel quadrangles, Santa Cruz County, Arizona: U.S. Geological Survey Miscellaneous Investigations Series Map I-762, 9 p., 1 sheet, scale 1:48,000.

USGS Lochiel Quadrangle topo map.

U.S. Bureau of Mines Coronado National Forest Study Report.

U.S. Bureau of Mines - Arizona Bureau of Geology and Mineral Technology file data - Exposed Reef Mines.

Arizona Department of Mineral Resources Exposed Reef and Blue Eagle Mine file.

Arizona Bureau of Mines card file Santa Cruz County.

MRDS database Dep. ID file #10048345, MRDS ID #M899932; and, Dep. ID #10283184, MAS ID #0040230187.

A former small underground Cu-Ag-Pb-Zn-Au-Fe mine located in the SW¼NE¼ sec. 30, T22S, R16E, 4 miles S of Patagonia, between the Flux and Andes Mine groups. Located on the NE side of Alum Gulch. The Blue Eagle group is located ½ mile to the SW, on the S side of Alum Gulch. Discovered 1875. Owned by Mr. Albert De Saulles and Helen & Doris Sibold (1953); and, also included Mr. John Farley; D. Dowd; and, J.B. Shannon.

Mineralization is a vein deposit with ore occurring in veins, fissures and contacts in rhyolite, and contacts with granoporphyry and quartz diorite. Ore concentration was secondary enrichment along fault fissures and replacement of wall rock. High grade ores tended to concentrate with bands of quartz in fissure veins. Extensive surface oxidation. Associated rock units include the Mt. Wrightson Formation and the Josephine Canyon Diorite.

Ores of the Exposed Reef and Blue Eagle groups are primarily argentiferous coppers with some gold and a stromg iron content. Numerous veins occur on the property containing low-grade sulfide ores. The main vein trends NW-SE across several claims. Veins generally have very wide mineralized outcrop copper ore bodies that increase, both in size and values, with depth. Veins vary in width from 1-30 feet.

The main vein paralleled by banded iron formation-hematite dike showing some copper stain, and by several smaller parallel quartz veins. There are five principal veins on the property. The ore zone is 914.4 meters long, 9.14 meters wide, strikes W and NW and dips nearly vertically. A general structure common to regional formations is a sheeting which dips 40NNW.

Tectonic elements include the Alum Gulch Fault Block.

Workings are 95.1 meters deep and include the 312 foot deep Exposed Reef shaft; a 36 foot long tunnel and open cut on the Saint Louis claim; the 500 foot long Exposed Reef tunnel that cuts 3 veins; numerous winzes and raises extending from shafts and tunnels; a 300 foot tunnel and 112 foot shaft on the Red Fox No. 1 claim; a total of 11 tunnels, from 10 to 500 feet long. Thee are 600 feet of drifts and crosscuts.

Assay values averaged 15% Cu, 15 oz./ton Ag, and $2.00/ton Au. No records of production.

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


8 valid minerals.

Detailed Mineral List:

Bornite
Formula: Cu5FeS4
Reference: MRDS database Dep. ID file #10048345, MRDS ID #M899932.
Chalcocite
Formula: Cu2S
Reference: MRDS database Dep. ID file #10048345, MRDS ID #M899932.
Chalcopyrite
Formula: CuFeS2
Reference: MRDS database Dep. ID file #10048345, MRDS ID #M899932.
Cuprite
Formula: Cu2O
Reference: MRDS database Dep. ID file #10048345, MRDS ID #M899932.
Galena
Formula: PbS
Reference: MRDS database Dep. ID file #10048345, MRDS ID #M899932.
Hematite
Formula: Fe2O3
Reference: MRDS database Dep. ID file #10048345, MRDS ID #M899932.
Pyrite
Formula: FeS2
Reference: MRDS database Dep. ID file #10048345, MRDS ID #M899932.
Sphalerite
Formula: ZnS
Reference: MRDS database Dep. ID file #10048345, MRDS ID #M899932.
'Tetrahedrite'
Formula: Cu6(Cu4X2)Sb4S13
Reference: MRDS database Dep. ID file #10048345, MRDS ID #M899932.

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
Bornite2.BA.15Cu5FeS4
Chalcocite2.BA.05Cu2S
Chalcopyrite2.CB.10aCuFeS2
Galena2.CD.10PbS
Pyrite2.EB.05aFeS2
Sphalerite2.CB.05aZnS
'Tetrahedrite'2.GB.05Cu6(Cu4X2)Sb4S13
Group 4 - Oxides and Hydroxides
Cuprite4.AA.10Cu2O
Hematite4.CB.05Fe2O3

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
AmXp, with m:p = 1:1
Galena2.8.1.1PbS
Sphalerite2.8.2.1ZnS
AmBnXp, with (m+n):p = 1:1
Chalcopyrite2.9.1.1CuFeS2
AmBnXp, with (m+n):p = 1:2
Pyrite2.12.1.1FeS2
Group 3 - SULFOSALTS
3 <ø < 4
'Tetrahedrite'3.3.6.1Cu6(Cu4X2)Sb4S13
Group 4 - SIMPLE OXIDES
A2X
Cuprite4.1.1.1Cu2O
A2X3
Hematite4.3.1.2Fe2O3

List of minerals for each chemical element

OOxygen
O HematiteFe2O3
O CupriteCu2O
SSulfur
S BorniteCu5FeS4
S ChalcociteCu2S
S ChalcopyriteCuFeS2
S GalenaPbS
S PyriteFeS2
S SphaleriteZnS
S TetrahedriteCu6(Cu4X2)Sb4S13
FeIron
Fe HematiteFe2O3
Fe BorniteCu5FeS4
Fe ChalcopyriteCuFeS2
Fe PyriteFeS2
CuCopper
Cu BorniteCu5FeS4
Cu ChalcociteCu2S
Cu ChalcopyriteCuFeS2
Cu CupriteCu2O
Cu TetrahedriteCu6(Cu4X2)Sb4S13
ZnZinc
Zn SphaleriteZnS
SbAntimony
Sb TetrahedriteCu6(Cu4X2)Sb4S13
PbLead
Pb GalenaPbS

Other Databases

USGS MRDS Record:10048345

Other Regions, Features and Areas containing this locality

North America
North America PlateTectonic Plate

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