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La Esperanza Mine, Iruya Department, Salta, Argentinai
Regional Level Types
La Esperanza MineMine
Iruya DepartmentDepartment
Salta- not defined -
ArgentinaCountry

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Pollymetalic Deposits(U, Ni, Co, As, Ag) of Jujuy and Salta.

La Esperanza Mine, Iruya Department, Salta, Argentina
Latitude & Longitude (WGS84): 22° 44' 22'' South , 65° 13' 18'' West
Latitude & Longitude (decimal): -22.73944,-65.22167
GeoHash:G#: 6ecweu7j1
Locality type:Mine
Köppen climate type:Cwb : Subtropical highland climate or temperate oceanic climate with dry winters
Nearest Settlements:
PlacePopulationDistance
Abra Pampa9,425 (2016)48.8km


Introduction: Mineralized fault fissures. It is a hydrothermal deposit in veins. Ore mine "La Esperanza", located at 60 km NNE of the station Iturbe in the Iruya Department, found the existence of Pitchblende associated Chalcosine and Bornite in carbonate gangue(Dolomite) and also to Galena and Sphalerite in certain places. The seams of this mining property staying on slates Cambro-Ordovicics. The U3O8 tenors recorded on pieces of ore are very variable, coming in a case to 2%. This site was exploited mainly by copper ores in the past and had several underground and opening of new work.

Mine La Esperanza (ex - Chacabuco).
Location:
It is located in the Valley of the San Juan River, 85 km in a straight line to the northeast of the station Iturbe, FCGB in the Iruya Department, and 6 kilometers from the Iruya town and 2,600 meters above the sea level, located on the eastern slope of the lace of Zenta.

Laws, reserves and production:
100 Tonnes of ore with 30% of Cu and 150 tons of plumbo-copper ore were extracted during the rehabilitation carried out in 1944. Comprised mineral between - 18 and the surface, in the main grain, exploded in beginning of century undertakings and in the Decade of the 1930s. U3O8 laws vary between 0.14% and 0.37%, Zn between 9.75% and 10.3%, Pb meets tenors from 10% to 21% and Cu between 19% and 23%, always on the main vein. Uranium is also extracted during 1960. On that occasion the CNEA made prospecting radimetric in all accessible levels, without reaching values of interest. The mentioned agency acquired 17 tonnes of uranium ore to trials and carried out work in search of a supposed pitchblende nail, whose finding is frusto to locate the underground position filled with material already exploited. This work comes from the mine was worked to arrangements even more low than - 125 meters. CNEA came to the conclusion that a reservation of moderate dimension nuclear ore poor would be - 75 meters below the Chacabuco tunnel.

Operating system:
It has 4 main tasks, being the Chacabuco tunnel most important with 350 meters long and where will take place the most important tilling and the tunnel Santa Ana of 130 meters. The rest of the work include other washouts, piques, fireplaces and enhancement work. All are flooded and collapsed.

History of the tank:
It was discovered in 1870 and was named Mina Chacabuco in the first Chronicles. It was exploited for the first time in 1907 and 1935 on a smaller scale. In 1944 the Argentina mining holdings company proceeded to their temporary rehabilitation. In 1960 the CNEA performed geological surveys, exploration and geophysical work, identifying portions of the nail home, relatively rich in U3O8 is located 75 meters lower than the level Chacabuco (Lobos, 1960). View of the CNEA low stocks not compensate for the high costs of drain, Blaze and others. During the 1970s the Provincial direction of Salta mines, took scanning tasks that improve the knowledge of the mineralization concentrated in the area of the nail, registering a small mining activity. Since that date the mine remains inactive.

Legal background:
It was registered as a copper mine with the assignment of 2 membership of 300 x 300 meters (1941): Eda membership that covers the main grain and works in execution and Lilia membership covering other veins untapped distant approximately 1,000 meters from the previous.

Regional Geology:
The saw of Zenta, in whose eastern slope is implanted deposit, corresponds to the Cordillera Oriental morphostructure, in a sector characterized by Precambrian and Ordovician units. The first correspond to the Puncoviscana Formation metapelites. The latter are reddish psamites of the Meson group.
The tectonic main of this morphological unit consists of extensive North-South, slightly oriented northeast, high angle faults, with drawings of dips to the West. A plot of minor fractures crossing the previous ones with multiple addresses, being significant in density and intensity in the District of mine hope. With them are the Chacabuco veins, Potrerillos and Potrero. In the vicinity of the site there are reefs of basic rocks and clear andesites.

Geology of the deposit:
Lithology: Box of the mineralization is formed by rocks of Puncoviscana formation consisting of metagrauvacs, green slates and phyllites, and quartzites and Shales of the Cambrian–Ordovician reddish. They have general North-South direction and dip to the West.
Structure: The veins follow tectonic faulting of second and third order weft. The entire area comprising a high degree of cracking deposit presented by effect of the closed mesh of fractures.
Morphology: The site is vetiform and consists of two units, one predominantly copper and the other plumbiferous that concentrated the main mining activity and presents traces blotters at sharp angle (Angelelli, 1984) in General. Of these, the main grain is E15°S course pitches between 80-85 ° at its deepest level. It presents an average of 10 to 20 cm. level - 55 power, where its mineralized travel reaches 80 meters, of which the richest stretch reaches 50 meters. On surface, it reaches up to 1 meter in power. This grain, taking into account the tectonic intersection cited, forms an ore shoot with a vertical development that is inferred surpassed 125 meters, level that could have reached the old holdings (Lobos, 1960). This unit comes out 150 meters west of the top of the main gallery. The second vein blotting, plumbiferous, presents greater metaliferous expectations. All streaks present brechia structure. In the case of the second vein, appears to be more compact, with power up to 1 meter and well defined interface with box, formed by tailor's fault.
Mineralogy: Lode plumbiferous consists of Galena in Baryte gangue. The copper vein, is constituted by Chalcocite, Sphalerite and Tetrahedrite. The level - 55 dominated the bornite. Brodtkorb(1965, 1973) cites Pitchblende, Gersdorffite, Linneite, Bornite, Chalcopyrite, Tetrahedrite-Tennantite, Chalcocite, Covellite, Sphalerite and Galena.
The supergenics minerals include Azurite, Malachite, Chrysocolla, Limonite and ochre of uranium in a timely manner.
Gangue grain, copper, Dolomite, as is that of the grain plumbiferous, is Baryte.

Regions containing this locality

South America PlateTectonic Plate
South AmericaContinent

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


24 valid minerals.

Detailed Mineral List:

Ankerite
Formula: Ca(Fe2+,Mg)(CO3)2
Reference: Brodtkorb (1963): 2a Jornadas Geologicas Argentinas 1:25-53, Salta
Azurite
Formula: Cu3(CO3)2(OH)2
Reference: Brodtkorb (1963): 2a Jornadas Geologicas Argentinas 1:25-53, Salta
Baryte
Formula: BaSO4
Reference: C. S. Lurgo Mayón (1999). Depósitos polimetálicos ricos en Níquel, Cobalto y Arsénico de la cordillera oriental, Jujuy y Salta.
Bornite
Formula: Cu5FeS4
Reference: Brodtkorb (1963): 2a Jornadas Geologicas Argentinas 1:25-53, Salta
Calcite
Formula: CaCO3
Reference: Brodtkorb (1963): 2a Jornadas Geologicas Argentinas 1:25-53, Salta
Chalcocite
Formula: Cu2S
Reference: Brodtkorb (1963): 2a Jornadas Geologicas Argentinas 1:25-53, Salta
Chalcopyrite
Formula: CuFeS2
Reference: Brodtkorb (1963): 2a Jornadas Geologicas Argentinas 1:25-53, Salta
Chrysocolla
Formula: Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
Reference: C. S. Lurgo Mayón (1999). Depósitos polimetálicos ricos en Níquel, Cobalto y Arsénico de la cordillera oriental, Jujuy y Salta.
Covellite
Formula: CuS
Reference: Brodtkorb (1963): 2a Jornadas Geologicas Argentinas 1:25-53, Salta
Dolomite
Formula: CaMg(CO3)2
Reference: C. S. Lurgo Mayón (1999). Depósitos polimetálicos ricos en Níquel, Cobalto y Arsénico de la cordillera oriental, Jujuy y Salta.
Galena
Formula: PbS
Reference: Brodtkorb (1963): 2a Jornadas Geologicas Argentinas 1:25-53, Salta
Gersdorffite
Formula: NiAsS
Reference: C. S. Lurgo Mayón (1999). Depósitos polimetálicos ricos en Níquel, Cobalto y Arsénico de la cordillera oriental, Jujuy y Salta.
Lead
Formula: Pb
Description: Native lead, associated with galena.
Reference: Brodtkorb, Milka K. de (2002) Las Especies Minerales de la República Argentina. Tomo I. (Asociación Mineralógica Argentina)
'Limonite'
Formula: (Fe,O,OH,H2O)
Reference: Brodtkorb (1963): 2a Jornadas Geologicas Argentinas 1:25-53, Salta
Linnaeite
Formula: Co2+Co3+2S4
Reference: Brodtkorb (1963): 2a Jornadas Geologicas Argentinas 1:25-53, Salta
Malachite
Formula: Cu2(CO3)(OH)2
Reference: Brodtkorb (1963): 2a Jornadas Geologicas Argentinas 1:25-53, Salta
Metazeunerite
Formula: Cu(UO2)2(AsO4)2 · 8H2O
Reference: Raúl Joreg Tauber Larry
Millerite
Formula: NiS
Reference: Brodtkorb (1963): 2a Jornadas Geologicas Argentinas 1:25-53, Salta
Quartz
Formula: SiO2
Reference: Brodtkorb (1963): 2a Jornadas Geologicas Argentinas 1:25-53, Salta
Sphalerite
Formula: ZnS
Reference: Brodtkorb (1963): 2a Jornadas Geologicas Argentinas 1:25-53, Salta
Tennantite
Formula: Cu6[Cu4(Fe,Zn)2]As4S13
Reference: Brodtkorb (1963): 2a Jornadas Geologicas Argentinas 1:25-53, Salta
Tetrahedrite
Formula: Cu6[Cu4(Fe,Zn)2]Sb4S13
Reference: Brodtkorb (1963): 2a Jornadas Geologicas Argentinas 1:25-53, Salta
Ullmannite
Formula: NiSbS
Reference: Anthony, Bideaux, Bladh, Nichols: "Handbook of Mineralogy", Vol. 1, 1990
Uraninite
Formula: UO2
Reference: Brodtkorb (1963): 2a Jornadas Geologicas Argentinas 1:25-53, Salta
Uraninite var: Pitchblende
Formula: UO2
Reference: Brodtkorb (1963): 2a Jornadas Geologicas Argentinas 1:25-53, Salta
Zeunerite
Formula: Cu(UO2)2(AsO4)2 · 12H2O
Reference: Raúl Joreg Tauber Larry

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
Lead1.AA.05Pb
Group 2 - Sulphides and Sulfosalts
Bornite2.BA.15Cu5FeS4
Chalcocite2.BA.05Cu2S
Chalcopyrite2.CB.10aCuFeS2
Covellite2.CA.05aCuS
Galena2.CD.10PbS
Gersdorffite2.EB.25NiAsS
Linnaeite2.DA.05Co2+Co3+2S4
Millerite2.CC.20NiS
Sphalerite2.CB.05aZnS
Tennantite2.GB.05Cu6[Cu4(Fe,Zn)2]As4S13
Tetrahedrite2.GB.05Cu6[Cu4(Fe,Zn)2]Sb4S13
Ullmannite2.EB.25NiSbS
Group 4 - Oxides and Hydroxides
Quartz4.DA.05SiO2
Uraninite4.DL.05UO2
var: Pitchblende4.DL.05UO2
Group 5 - Nitrates and Carbonates
Ankerite5.AB.10Ca(Fe2+,Mg)(CO3)2
Azurite5.BA.05Cu3(CO3)2(OH)2
Calcite5.AB.05CaCO3
Dolomite5.AB.10CaMg(CO3)2
Malachite5.BA.10Cu2(CO3)(OH)2
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
Baryte7.AD.35BaSO4
Group 8 - Phosphates, Arsenates and Vanadates
Metazeunerite8.EB.10Cu(UO2)2(AsO4)2 · 8H2O
Zeunerite8.EB.05Cu(UO2)2(AsO4)2 · 12H2O
Group 9 - Silicates
Chrysocolla9.ED.20Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
Unclassified Minerals, Rocks, etc.
'Limonite'-(Fe,O,OH,H2O)

List of minerals arranged by Dana 8th Edition classification

Group 1 - NATIVE ELEMENTS AND ALLOYS
Metals, other than the Platinum Group
Lead1.1.1.4Pb
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
Covellite2.8.12.1CuS
Galena2.8.1.1PbS
Millerite2.8.16.1NiS
Sphalerite2.8.2.1ZnS
AmBnXp, with (m+n):p = 1:1
Chalcopyrite2.9.1.1CuFeS2
AmBnXp, with (m+n):p = 3:4
Linnaeite2.10.1.1Co2+Co3+2S4
AmBnXp, with (m+n):p = 1:2
Gersdorffite2.12.3.2NiAsS
Ullmannite2.12.3.3NiSbS
Group 3 - SULFOSALTS
3 <ø < 4
Tennantite3.3.6.2Cu6[Cu4(Fe,Zn)2]As4S13
Tetrahedrite3.3.6.1Cu6[Cu4(Fe,Zn)2]Sb4S13
Group 5 - OXIDES CONTAINING URANIUM OR THORIUM
AXO2·xH2O
Uraninite5.1.1.1UO2
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Calcite14.1.1.1CaCO3
AB(XO3)2
Ankerite14.2.1.2Ca(Fe2+,Mg)(CO3)2
Dolomite14.2.1.1CaMg(CO3)2
Group 16a - ANHYDROUS CARBONATES CONTAINING HYDROXYL OR HALOGEN
Azurite16a.2.1.1Cu3(CO3)2(OH)2
Malachite16a.3.1.1Cu2(CO3)(OH)2
Group 28 - ANHYDROUS ACID AND NORMAL SULFATES
AXO4
Baryte28.3.1.1BaSO4
Group 40 - HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
AB2(XO4)2·xH2O, containing (UO2)2+
Metazeunerite40.2a.14.2Cu(UO2)2(AsO4)2 · 8H2O
Zeunerite40.2a.14.1Cu(UO2)2(AsO4)2 · 12H2O
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.
'Limonite'-(Fe,O,OH,H2O)
Uraninite
var: Pitchblende
-UO2

List of minerals for each chemical element

HHydrogen
H AzuriteCu3(CO3)2(OH)2
H MalachiteCu2(CO3)(OH)2
H Limonite(Fe,O,OH,H2O)
H ZeuneriteCu(UO2)2(AsO4)2 · 12H2O
H MetazeuneriteCu(UO2)2(AsO4)2 · 8H2O
H ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
CCarbon
C AnkeriteCa(Fe2+,Mg)(CO3)2
C CalciteCaCO3
C AzuriteCu3(CO3)2(OH)2
C MalachiteCu2(CO3)(OH)2
C DolomiteCaMg(CO3)2
OOxygen
O Uraninite (var: Pitchblende)UO2
O AnkeriteCa(Fe2+,Mg)(CO3)2
O CalciteCaCO3
O QuartzSiO2
O AzuriteCu3(CO3)2(OH)2
O MalachiteCu2(CO3)(OH)2
O Limonite(Fe,O,OH,H2O)
O ZeuneriteCu(UO2)2(AsO4)2 · 12H2O
O MetazeuneriteCu(UO2)2(AsO4)2 · 8H2O
O BaryteBaSO4
O DolomiteCaMg(CO3)2
O ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
O UraniniteUO2
MgMagnesium
Mg AnkeriteCa(Fe2+,Mg)(CO3)2
Mg DolomiteCaMg(CO3)2
AlAluminium
Al ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
SiSilicon
Si QuartzSiO2
Si ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
SSulfur
S UllmanniteNiSbS
S GalenaPbS
S SphaleriteZnS
S BorniteCu5FeS4
S ChalcopyriteCuFeS2
S LinnaeiteCo2+Co23+S4
S MilleriteNiS
S TetrahedriteCu6[Cu4(Fe,Zn)2]Sb4S13
S ChalcociteCu2S
S CovelliteCuS
S TennantiteCu6[Cu4(Fe,Zn)2]As4S13
S BaryteBaSO4
S GersdorffiteNiAsS
CaCalcium
Ca AnkeriteCa(Fe2+,Mg)(CO3)2
Ca CalciteCaCO3
Ca DolomiteCaMg(CO3)2
FeIron
Fe BorniteCu5FeS4
Fe ChalcopyriteCuFeS2
Fe TetrahedriteCu6[Cu4(Fe,Zn)2]Sb4S13
Fe AnkeriteCa(Fe2+,Mg)(CO3)2
Fe Limonite(Fe,O,OH,H2O)
CoCobalt
Co LinnaeiteCo2+Co23+S4
NiNickel
Ni UllmanniteNiSbS
Ni MilleriteNiS
Ni GersdorffiteNiAsS
CuCopper
Cu BorniteCu5FeS4
Cu ChalcopyriteCuFeS2
Cu TetrahedriteCu6[Cu4(Fe,Zn)2]Sb4S13
Cu ChalcociteCu2S
Cu CovelliteCuS
Cu AzuriteCu3(CO3)2(OH)2
Cu MalachiteCu2(CO3)(OH)2
Cu TennantiteCu6[Cu4(Fe,Zn)2]As4S13
Cu ZeuneriteCu(UO2)2(AsO4)2 · 12H2O
Cu MetazeuneriteCu(UO2)2(AsO4)2 · 8H2O
Cu ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
ZnZinc
Zn SphaleriteZnS
Zn TetrahedriteCu6[Cu4(Fe,Zn)2]Sb4S13
AsArsenic
As TennantiteCu6[Cu4(Fe,Zn)2]As4S13
As ZeuneriteCu(UO2)2(AsO4)2 · 12H2O
As MetazeuneriteCu(UO2)2(AsO4)2 · 8H2O
As GersdorffiteNiAsS
SbAntimony
Sb UllmanniteNiSbS
Sb TetrahedriteCu6[Cu4(Fe,Zn)2]Sb4S13
BaBarium
Ba BaryteBaSO4
PbLead
Pb GalenaPbS
Pb LeadPb
UUranium
U Uraninite (var: Pitchblende)UO2
U ZeuneriteCu(UO2)2(AsO4)2 · 12H2O
U MetazeuneriteCu(UO2)2(AsO4)2 · 8H2O
U UraniniteUO2

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

Paleozoic - Neoproterozoic
251.902 - 1000 Ma



ID: 3189158
Precambrian-Phanerozoic sedimentary rocks

Age: Neoproterozoic to Triassic (251.902 - 1000 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)
Victorio Angelelli (1958) - Los Minerales de Uranio sus Yacimientos y Prospección. Departamento de Geología y Minería. Comisión Nacional de Energía Atómica.
M. K. de Brodtkorb (1965). Estudio de la mineralización del yacimiento La Esperanza, prov. de Salta. 2as. Jornadas Geológicas Argentinas, 1, en Cata Geológica Lilloana, 5. San Miguel de Tucumán.
M. K. de Brodtkorb (1973). Estudio de la mineralización del yacimiento La Niquelina, prov. de Salta, y un análisis comparativo de sus posibles relaciones con los depósitos Romicruz y Esperanza. Revista de la Asociación Geológica Argentina, 28 (4): 364-368.
C. S. Lurgo Mayón (1999). Depósitos polimetálicos ricos en Níquel, Cobalto y Arsénico de la cordillera oriental, Jujuy y Salta.
Carlos S. Lurgo Mayón (1999). Recursos Minerales de la República Argentina. Volumen II, Anales N° 35, Subsecretaría de Minería de la Nación - SEGEMAR (Servicio Greológico Minero Argentino).


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