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San Xavier pit (San Xavier open pit; San Xavier West Mine; San Xavier Unit Open pit), Mission complex, San Xavier, Pima District (Olive District; Mineral Hill District; Twin Buttes District), Sierrita Mts, Pima Co., Arizona, USAi
Regional Level Types
San Xavier pit (San Xavier open pit; San Xavier West Mine; San Xavier Unit Open pit)Pit
Mission complexComplex
San Xavier- not defined -
Pima District (Olive District; Mineral Hill District; Twin Buttes District)Mining District
Sierrita MtsMountain Range
Pima Co.County
ArizonaState
USACountry

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Key
Lock Map
Latitude & Longitude (WGS84): 32° 1' 36'' North , 111° 4' 48'' West
Latitude & Longitude (decimal): 32.02667,-111.08000
GeoHash:G#: 9t9n0q60b
USGS MRDS Record:10113892
Locality type:Pit
Köppen climate type:BSh : Hot semi-arid (steppe) climate
Nearest Settlements:
PlacePopulationDistance
Valencia West9,355 (2011)12.2km
Summit5,372 (2011)12.9km
Drexel Heights27,749 (2011)13.6km
Sahuarita25,707 (2017)14.0km
East Sahuarita1,622 (2006)17.1km


A surface Cu-Ag mine located in the NE¼ sec. 23 & the NW¼ sec. 24, T16S, R12E. Discovered in 1955 by ASARCO geologists. Owned by the American Smelting & Refining Co. (ASARCO).

Mineralization is siliceous oxidized copper minerals in Cretaceous sedimentary rocks under alluvium cover.

Workings are an open pit operation. From 1967 through 1972, produced over 521,000 tons of leaching ore averaging about 0.76% Cu and 0.02 ounce/ton Ag.

Regions containing this locality

North America PlateTectonic Plate
Sonoran Desert, North AmericaDesert

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


15 valid minerals.

Detailed Mineral List:

Aragonite
Formula: CaCO3
Habit: Crystals
Reference: Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 118.
Aurichalcite
Formula: (Zn,Cu)5(CO3)2(OH)6
Reference: Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 123.
Azurite
Formula: Cu3(CO3)2(OH)2
Reference: personal communication, Fred Rhodes, 1993
Brochantite
Formula: Cu4(SO4)(OH)6
Reference: Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 146.
Calcite
Formula: CaCO3
Habit: Flat-bladed.
Reference: Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 357.
Chalcanthite
Formula: CuSO4 · 5H2O
Reference: Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 161.
Chrysocolla
Formula: Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
Reference: personal communication, Fred Rhodes, 1993
Coquimbite
Formula: Fe2-xAlx(SO4)3 · 9H2O, x ~0.5
Reference: Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 186.
Hemimorphite
Formula: Zn4Si2O7(OH)2 · H2O
Reference: Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 248.
Malachite
Formula: Cu2(CO3)(OH)2
Reference: personal communication, Fred Rhodes, 1993
Marcasite
Formula: FeS2
Description: Occurs as thin coatings and veinlets.
Reference: Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 290.
Melanterite
Formula: Fe2+(H2O)6SO4 · H2O
Reference: Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 292.
Rosasite
Formula: (Cu,Zn)2(CO3)(OH)2
Description: Occurs intergrown with flat-bladed calcite.
Reference: Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 357.
Sepiolite
Formula: Mg4(Si6O15)(OH)2 · 6H2O
Reference: Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 366.
Sphalerite
Formula: ZnS
Reference: Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 377.

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
Marcasite2.EB.10aFeS2
Sphalerite2.CB.05aZnS
Group 5 - Nitrates and Carbonates
Aragonite5.AB.15CaCO3
Aurichalcite5.BA.15(Zn,Cu)5(CO3)2(OH)6
Azurite5.BA.05Cu3(CO3)2(OH)2
Calcite5.AB.05CaCO3
Malachite5.BA.10Cu2(CO3)(OH)2
Rosasite5.BA.10(Cu,Zn)2(CO3)(OH)2
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
Brochantite7.BB.25Cu4(SO4)(OH)6
Chalcanthite7.CB.20CuSO4 · 5H2O
Coquimbite7.CB.55Fe2-xAlx(SO4)3 · 9H2O, x ~0.5
Melanterite7.CB.35Fe2+(H2O)6SO4 · H2O
Group 9 - Silicates
Chrysocolla9.ED.20Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
Hemimorphite9.BD.10Zn4Si2O7(OH)2 · H2O
Sepiolite9.EE.25Mg4(Si6O15)(OH)2 · 6H2O

List of minerals arranged by Dana 8th Edition classification

Group 2 - SULFIDES
AmXp, with m:p = 1:1
Sphalerite2.8.2.1ZnS
AmBnXp, with (m+n):p = 1:2
Marcasite2.12.2.1FeS2
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Calcite14.1.1.1CaCO3
Group 16a - ANHYDROUS CARBONATES CONTAINING HYDROXYL OR HALOGEN
Azurite16a.2.1.1Cu3(CO3)2(OH)2
Malachite16a.3.1.1Cu2(CO3)(OH)2
Rosasite16a.3.1.2(Cu,Zn)2(CO3)(OH)2
Aurichalcite16a.4.2.1(Zn,Cu)5(CO3)2(OH)6
Group 29 - HYDRATED ACID AND NORMAL SULFATES
AXO4·xH2O
Chalcanthite29.6.7.1CuSO4 · 5H2O
Melanterite29.6.10.1Fe2+(H2O)6SO4 · H2O
A2(XO4)3·H2O
Coquimbite29.8.3.1Fe2-xAlx(SO4)3 · 9H2O, x ~0.5
Group 30 - ANHYDROUS SULFATES CONTAINING HYDROXYL OR HALOGEN
(AB)m(XO4)pZq, where m:p>2:1
Brochantite30.1.3.1Cu4(SO4)(OH)6
Group 56 - SOROSILICATES Si2O7 Groups, With Additional O, OH, F and H2O
Si2O7 Groups and O, OH, F, and H2O with cations in [4] coordination
Hemimorphite56.1.2.1Zn4Si2O7(OH)2 · H2O
Group 74 - PHYLLOSILICATES Modulated Layers
Modulated Layers with joined strips
Chrysocolla74.3.2.1Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
Sepiolite74.3.1b.1Mg4(Si6O15)(OH)2 · 6H2O
Unclassified Minerals, Mixtures, etc.
Aragonite-CaCO3

List of minerals for each chemical element

HHydrogen
H Aurichalcite(Zn,Cu)5(CO3)2(OH)6
H BrochantiteCu4(SO4)(OH)6
H ChalcanthiteCuSO4 · 5H2O
H CoquimbiteFe2-xAlx(SO4)3 · 9H2O, x ~0.5
H HemimorphiteZn4Si2O7(OH)2 · H2O
H MelanteriteFe2+(H2O)6SO4 · H2O
H Rosasite(Cu,Zn)2(CO3)(OH)2
H SepioliteMg4(Si6O15)(OH)2 · 6H2O
H AzuriteCu3(CO3)2(OH)2
H MalachiteCu2(CO3)(OH)2
H ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
CCarbon
C AragoniteCaCO3
C Aurichalcite(Zn,Cu)5(CO3)2(OH)6
C Rosasite(Cu,Zn)2(CO3)(OH)2
C CalciteCaCO3
C AzuriteCu3(CO3)2(OH)2
C MalachiteCu2(CO3)(OH)2
OOxygen
O AragoniteCaCO3
O Aurichalcite(Zn,Cu)5(CO3)2(OH)6
O BrochantiteCu4(SO4)(OH)6
O ChalcanthiteCuSO4 · 5H2O
O CoquimbiteFe2-xAlx(SO4)3 · 9H2O, x ~0.5
O HemimorphiteZn4Si2O7(OH)2 · H2O
O MelanteriteFe2+(H2O)6SO4 · H2O
O Rosasite(Cu,Zn)2(CO3)(OH)2
O CalciteCaCO3
O SepioliteMg4(Si6O15)(OH)2 · 6H2O
O AzuriteCu3(CO3)2(OH)2
O MalachiteCu2(CO3)(OH)2
O ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
MgMagnesium
Mg SepioliteMg4(Si6O15)(OH)2 · 6H2O
AlAluminium
Al ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
SiSilicon
Si HemimorphiteZn4Si2O7(OH)2 · H2O
Si SepioliteMg4(Si6O15)(OH)2 · 6H2O
Si ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
SSulfur
S BrochantiteCu4(SO4)(OH)6
S ChalcanthiteCuSO4 · 5H2O
S CoquimbiteFe2-xAlx(SO4)3 · 9H2O, x ~0.5
S MarcasiteFeS2
S MelanteriteFe2+(H2O)6SO4 · H2O
S SphaleriteZnS
CaCalcium
Ca AragoniteCaCO3
Ca CalciteCaCO3
FeIron
Fe CoquimbiteFe2-xAlx(SO4)3 · 9H2O, x ~0.5
Fe MarcasiteFeS2
Fe MelanteriteFe2+(H2O)6SO4 · H2O
CuCopper
Cu Aurichalcite(Zn,Cu)5(CO3)2(OH)6
Cu BrochantiteCu4(SO4)(OH)6
Cu ChalcanthiteCuSO4 · 5H2O
Cu Rosasite(Cu,Zn)2(CO3)(OH)2
Cu AzuriteCu3(CO3)2(OH)2
Cu MalachiteCu2(CO3)(OH)2
Cu ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
ZnZinc
Zn Aurichalcite(Zn,Cu)5(CO3)2(OH)6
Zn HemimorphiteZn4Si2O7(OH)2 · H2O
Zn Rosasite(Cu,Zn)2(CO3)(OH)2
Zn SphaleriteZnS

Regional Geology

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



ID: 2774482
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)

Comments: Original map source: Arizona Geological Survey, DI-8 Geologic Map of Arizona, Digital Spatial data for the Geologic Map of Arizona, v. 3.0, edited by S.M. Richard and S.M. Kneale, 2002, 10 p., 2 DOS HD disks. Arc/INFO export file (.e00) format, scale 1:1,000,000.

Lithology: Major:{sand,silt,clay}

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. [133]

Quaternary - Miocene
0 - 23.03 Ma



ID: 3185380
Cenozoic sedimentary rocks

Age: Cenozoic (0 - 23.03 Ma)

Lithology: Sedimentary rocks

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Keith, Stanton B. (1974), Arizona Bureau of Geology & Mineral Technology, Geological Survey Branch Bull. 189, Index of Mining Properties in Pima County, Arizona: 138 (Table 4).
Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd. ed.: 118, 123, 146, 161, 186, 248, 290, 292, 357, 366, 377.
USGS San Xavier Mission Quadrangle topo map.
Arizona Bureau of Mines file data.
MRDS database Dep. ID file #10113892, MRDS ID #M050619, MAS ID #0040190390.

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