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Eclipse Mine group, Helvetia, Helvetia-Rosemont Mining District, Pima Co., Arizona, USAi
Regional Level Types
Eclipse Mine group- not defined -
Helvetia- not defined -
Helvetia-Rosemont Mining DistrictMining District
Pima Co.County
ArizonaState
USACountry

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Key
Latitude & Longitude (WGS84):
31° 51' 14'' North , 110° 45' 39'' West
Latitude & Longitude (decimal):
Nearest Settlements:
PlacePopulationDistance
Corona de Tucson5,675 (2011)12.5km
East Sahuarita1,622 (2006)18.7km
Sahuarita25,707 (2017)21.7km
Sonoita818 (2015)21.7km
Green Valley21,391 (2011)22.0km


A former small underground Cu-Pb-Ag-Au-Mo-Zn mine group of three claims (1 patented, 2 unpatented) located in South-central sec. 24 & North-central sec. 25, T.18S., R.15E, 28 miles SE of Tucson. This group of claims lies on the rugged crest of the range at an elevation of about 5,000 feet, between the helvetia properties on the west and the Rosemont properties on the east. Owned by G.E. Dunbar of Kalamazoo, Michigan (circa 1915); and, Steinfeld & Co.

Mineralization is irregular ferruginous gossan zone with copper and lead carbonates underlain locally by disseminated and massive chalcocite and argentiferous galena in pyrometasomatic replacement deposits along a faulted contact. The contact is upfaulted cupriferous Paleozoic quartzite on the west and the overlying silicated limestone on the east, in thrust-faulted block segments. This contact is known as the 'second contact.' The limestone along the contact is well-mineralized for a width of 20 feet or more and contains the metals indicated in the croppings by a ferruginous copper carbonate gossan or iron cap. The impervious quartzite footwall was seemingly an important physical factor in the concentration of the ore. Host rock units are the Concha Limestone (cherty limestone), the Scherrer Formation and quartzitic sandstone. An associated rock unit is quartz latite (56 ± 2MY). Alteration included gossan and skarn. The ore is 45.72 meters depth to bottom and 11.28 meters thick.

Local structures include thrust and normal faulting, fracture zones, homoclinal. Regional trends include tilting and broad open folds in the south and extensive faulting in the north.

Workings included a shaft. Production was prior to 1900, years estimated.

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List

Mineral list contains entries from the region specified including sub-localities

16 valid minerals.

Rock Types Recorded

Note: this is a very new system on mindat.org and data is currently VERY limited. Please bear with us while we work towards adding this information!

Rock list contains entries from the region specified including sub-localities

Select Rock List Type

Alphabetical List Tree Diagram

Detailed Mineral List:

Azurite
Formula: Cu3(CO3)2(OH)2
Reference: Rolf Luetcke
Calcite
Formula: CaCO3
Reference: rolf luetcke
Chalcocite
Formula: Cu2S
Reference: Keith, Stanton B. (1974), AZ Bur. of Geol. & Min. Technology, Geol. Survey Br. Bull. 189, Index of Mining Properties in Pima County, AZ: 125 (Table 4); Schrader (1915): 118; Arizona Bureau of Mines file data.
Chalcopyrite
Formula: CuFeS2
Reference: MRDS database Dep. ID file #10039407, MRDS ID #M050040.
Chrysocolla
Formula: Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
Reference: rolf luetcke
Galena
Formula: PbS
Reference: Keith, Stanton B. (1974), AZ Bur. of Geol. & Min. Technology, Geol. Survey Br. Bull. 189, Index of Mining Properties in Pima County, AZ: 125 (Table 4); Schrader (1915): 118; Arizona Bureau of Mines file data.
Galena var: Argentiferous Galena
Formula: PbS
Reference: Keith, Stanton B. (1974), AZ Bur. of Geol. & Min. Technology, Geol. Survey Br. Bull. 189, Index of Mining Properties in Pima County, AZ: 125 (Table 4); Schrader (1915): 118; Arizona Bureau of Mines file data.
Hematite
Formula: Fe2O3
Reference: rolf luetcke
Jarosite
Formula: KFe3+ 3(SO4)2(OH)6
Reference: Rolf Luetcke
Kaolinite
Formula: Al2(Si2O5)(OH)4
Reference: rolf luetcke
Libethenite
Formula: Cu2(PO4)(OH)
Reference: Rolf Luetcke
'Limonite'
Formula: (Fe,O,OH,H2O)
Reference: rolf luetcke
Malachite
Formula: Cu2(CO3)(OH)2
Reference: Rolf Luetcke
Molybdenite
Formula: MoS2
Reference: MRDS database Dep. ID file #10039407, MRDS ID #M050040.
Pyrite
Formula: FeS2
Reference: MRDS database Dep. ID file #10039407, MRDS ID #M050040.
Quartz
Formula: SiO2
Reference: rolf luetcke
Rosasite
Formula: (Cu,Zn)2(CO3)(OH)2
Reference: rolf luetcke
Sphalerite
Formula: ZnS
Reference: MRDS database Dep. ID file #10039407, MRDS ID #M050040.

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
Chalcocite2.BA.05Cu2S
Chalcopyrite2.CB.10aCuFeS2
Galena2.CD.10PbS
var: Argentiferous Galena2.CD.10PbS
Molybdenite2.EA.30MoS2
Pyrite2.EB.05aFeS2
Sphalerite2.CB.05aZnS
Group 4 - Oxides and Hydroxides
Hematite4.CB.05Fe2O3
Quartz4.DA.05SiO2
Group 5 - Nitrates and Carbonates
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
Jarosite7.BC.10KFe3+3(SO4)2(OH)6
Group 8 - Phosphates, Arsenates and Vanadates
Libethenite8.BB.30Cu2(PO4)(OH)
Group 9 - Silicates
Chrysocolla9.ED.20Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
Kaolinite9.ED.05Al2(Si2O5)(OH)4
Unclassified Minerals, Rocks, etc.
'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
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
Molybdenite2.12.10.1MoS2
Pyrite2.12.1.1FeS2
Group 4 - SIMPLE OXIDES
A2X3
Hematite4.3.1.2Fe2O3
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
Group 30 - ANHYDROUS SULFATES CONTAINING HYDROXYL OR HALOGEN
(AB)2(XO4)Zq
Jarosite30.2.5.1KFe3+ 3(SO4)2(OH)6
Group 41 - ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
A2(XO4)Zq
Libethenite41.6.6.2Cu2(PO4)(OH)
Group 74 - PHYLLOSILICATES Modulated Layers
Modulated Layers with joined strips
Chrysocolla74.3.2.1Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Unclassified Minerals, Mixtures, etc.
Galena
var: Argentiferous Galena
-PbS
Kaolinite-Al2(Si2O5)(OH)4
'Limonite'-(Fe,O,OH,H2O)

List of minerals for each chemical element

HHydrogen
H AzuriteCu3(CO3)2(OH)2
H MalachiteCu2(CO3)(OH)2
H LibetheniteCu2(PO4)(OH)
H JarositeKFe3+ 3(SO4)2(OH)6
H ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
H KaoliniteAl2(Si2O5)(OH)4
H Rosasite(Cu,Zn)2(CO3)(OH)2
H Limonite(Fe,O,OH,H2O)
CCarbon
C AzuriteCu3(CO3)2(OH)2
C MalachiteCu2(CO3)(OH)2
C CalciteCaCO3
C Rosasite(Cu,Zn)2(CO3)(OH)2
OOxygen
O AzuriteCu3(CO3)2(OH)2
O MalachiteCu2(CO3)(OH)2
O LibetheniteCu2(PO4)(OH)
O JarositeKFe3+ 3(SO4)2(OH)6
O CalciteCaCO3
O HematiteFe2O3
O ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
O KaoliniteAl2(Si2O5)(OH)4
O Rosasite(Cu,Zn)2(CO3)(OH)2
O QuartzSiO2
O Limonite(Fe,O,OH,H2O)
AlAluminium
Al ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
Al KaoliniteAl2(Si2O5)(OH)4
SiSilicon
Si ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
Si KaoliniteAl2(Si2O5)(OH)4
Si QuartzSiO2
PPhosphorus
P LibetheniteCu2(PO4)(OH)
SSulfur
S ChalcociteCu2S
S Galena (var: Argentiferous Galena)PbS
S ChalcopyriteCuFeS2
S MolybdeniteMoS2
S PyriteFeS2
S SphaleriteZnS
S JarositeKFe3+ 3(SO4)2(OH)6
S GalenaPbS
KPotassium
K JarositeKFe3+ 3(SO4)2(OH)6
CaCalcium
Ca CalciteCaCO3
FeIron
Fe ChalcopyriteCuFeS2
Fe PyriteFeS2
Fe JarositeKFe3+ 3(SO4)2(OH)6
Fe HematiteFe2O3
Fe Limonite(Fe,O,OH,H2O)
CuCopper
Cu ChalcociteCu2S
Cu ChalcopyriteCuFeS2
Cu AzuriteCu3(CO3)2(OH)2
Cu MalachiteCu2(CO3)(OH)2
Cu LibetheniteCu2(PO4)(OH)
Cu ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
Cu Rosasite(Cu,Zn)2(CO3)(OH)2
ZnZinc
Zn SphaleriteZnS
Zn Rosasite(Cu,Zn)2(CO3)(OH)2
MoMolybdenum
Mo MolybdeniteMoS2
PbLead
Pb Galena (var: Argentiferous Galena)PbS
Pb GalenaPbS

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Schrader, F.C. & J.M. Hill (1915), Mineral deposits of the Santa Rita and Patagonia Mountains, Arizona, USGS Bull. 582- 118.
Drewes, H.D. (1971) Geologic map of the Sahuarita quadrangle, southeast of Tucson, Pima County, Arizona- U.S. Geological Survey Miscellaneous Geologic Investigations Map I-613, 1 sheet, scale 1-48,000.
USGS Sahuarita Quadrangle topo map.Arizona Bureau of Mines field notes (1971), vol. 1, no. 2.
Keith, Stanton B. (1974), Arizona Bureau of Geology & Mineral Technology, Geological Survey Branch Bull. 189, Index of Mining Properties in Pima County, Arizona- 125 (Table 4).
MRDS database Dep. ID file #10039407.

Other Databases

USGS MRDS Record:10039407

Localities in this Region

Other Regions, Features and Areas containing this locality

North America
North America PlateTectonic Plate
USA

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