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Purísima Mine, Abra Pampa district, Cochinoca Department, Jujuy Province, Argentinai
Regional Level Types
Purísima MineMine
Abra Pampa districtDistrict
Cochinoca DepartmentDepartment
Jujuy ProvinceProvince
ArgentinaCountry

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Key
Latitude & Longitude (WGS84):
22° 51' 14'' South , 65° 34' 28'' West
Latitude & Longitude (decimal):
Locality type:
Nearest Settlements:
PlacePopulationDistance
Abra Pampa9,425 (2016)19.4km
El Aguilar3,655 (2016)43.1km
Humahuaca11,369 (2015)45.3km
Name(s) in local language(s):
Mina Purísima, Departamento Cochinoca, Provincia de Jujuy, Argentina.


Introduction:
It is an area with medium density of copper by streaks and plumbiferous that make up a small district of approximately 30 square kilometers.

Location:
Purísima Mine, which is the mineralized southernmost district is located 19 kilometers southeast of the Abra Pampa, Jujeña locality, in the Cochinoca Department with elevation of 3,923 m. above sea level. It is situated close to the first western foothills of the Cordillera Oriental.

Laws, reserves and production:
The Industrial Bank of the Argentina Republic defined reservations in 1968 amounted to 2,250 tonnes of ore likely to Cu and 4,500 tonnes between probable and possible, i.e. a total of 6,750 tons with an ore of copper of 5.5%. The laws of Pb reach highs of 7%. Ni ranges from 0.01 to 0.3%, and Ag reaches 270 grams per tonne. Ramallo (1975) indicated reserves of 500,000 tons of Cu ore. There were plans for exploration and exploitation mechanization.

Operating system:
The mine was exploited by underground workings which include 450 metres of galleries, 40 meters from piques, pit 20 meters and 30 meters of chiflones.

History of the tank:
Background: Mine Rumicruz was the first concession of the area, 10 kilometres north of Purisima mine, and dates back to 1942; It was briefly studied by a Commission of the DGFM in 1947. Angelelli appointment in 1950, time in which the second unit had not been discovered. For that then Rumicruz was worked continuously on a small scale. Purisima was concession, along with his mining group, in 1956, replacing the previous. After passing through ups and downs in his production company C.I.M.S.A., dedicated to the manufacture of electrical conductors, intensifies the work processing the material in Buenos Aires, where they had the plant. In 1971, during the term of the Plan Cordillerano North, the sector is declared reserve Area N ° 7, until it was lifted by the provincial government. In the mid-1980s is an intensive exploitation of the district.

Regional Geology:
The district is inserted into the morphostructure Puna, on the boundary with the Cordillera Oriental. The main aflorante unit corresponds to Santa Victoria Group sediments of ordovicic age. The lower section (Santa Rosa formation) of age Tremadonciana, constitute the basement of the area and is composed of argillaceous Shales with passage to very fine, fissile, micaceas sandstones of dark bluish grey to yellowish green with intercalations of quartzite and quartz-feldspatic, fine, psamitas with clay concretions frequent. They were deposited in a coastal environment and frequent pyrite that characterizes this unit signals conditions euxinicas. Feldspathic sandstones are still in transition and graywackes, fine-grained to medium, green grey, millimetric banks to centimetricos, with structures onduliticas & frequent guides of quartz in matching capes and drying to sedimentation, which correspond to the age Arenigiana, Acoyte Formation. They remain in disagreement red psamites of Pirgua formation (upper Cretaceous), whose continental sedimentation starts with a conglomerate of base significantly represented in the area of age possibly Santoniana.
The structure of the region is characterized by folds caledonics, narrow and asymmetric, flanked by extensive, inverse first order faults with high angle bends inclined between 60 ° and 65 ° West. Less frequent, wide and symmetrical folds involve Cretaceous units in the north-eastern corner of the territory and are assigned to the andic cycle. Failure of normal type flank the previous or cross them, moving them slightly in some points and setting up a mosaic whose tectonic density intensifies towards the sector of Purisima mine and mine Rumicruz (up to 50 faults per square kilometre). The fractures that channeled to the mineralization fluids are East-West direction.

Geology of the deposit:
Lithology: in mine Rumicruz there are quartz, yellowish shale with porce in East-West direction and sharp dip to the North. In mine Purísima boxes correspond to a succession of fine psamites, partly shaly, Sandy-clayey, grey green beige and green color. There are pink and gray, sloping quartzite intercalations.
Structure: in the mining sector, and to be dense fractures in general, are those with East-West directions, whose tectonic breaches constitute the reservoir of metallization in mine Purisima. In Rumicruz, on the other hand, structural control is given by the fisibilidad and porce whose planes were exploited by mineral suplement solutions.
Morphology: In mine Rumicruz the mineralizations are planes of fisibilidad-porce, so not enough a well defined geometric identity, but rather fuzzy, at least for the known part of the deposit.
In mine Purisima and the rest of the mining group, mineralization appears invading tectonic gaps associated with the East-West fault, with inclinations of 45 ° N. The outcrops reach 2,000 meters. These gaps are cataclasitas generated in Ordovician sediments, possibly during the Cretaceous. The gaps reach up to 1.5 meters. They therefore acquire a lenticular geometry accented with columns enriched by concomitant factors, as the presence of cross fracturing. Ramallo (1975) cited for the district outcrops of ledge gaps with traces of copper metallization, which could indicate a tectonic adjustment and a second phase of mineralization.
Alteration: alteration on the boxes next to the veins is meagre. However in the District have been marked three halos of alteration with up to 1,000 x 400 meters characterized by incipient kaolinization, light ferric oxidation and presence of a mesh of stringers of barite and quartz. Locally the halos appear to have structural correspondence, judging by available alineda neighbors to certain accidents of this type. Geochemistry of rock allowed us to define areas with significant defects of Cu-Pb and minors of Ni and Zn. These areas may represent levels of ceiling corresponding to the vetiforme model.
Mineralization: mineralization consists of Chalcocite, Bornite, chalcopyrite, Galena and Nickeline, which accompany Pitchblende, Nickeline, Rammelsbergita, Gersdorffita, Bornite, tetrahedrite-Tennantita, Covelina, sphalerite, Galena and gold. The ganga is quartz and barite.

Genetic model:
Deposits the Nickeline, La Esperanza, Rumicruz and Purísima correspond to polymetallic deposits of heavy metals and uranium, type Five Element Deposits (U, Ni, Co, As, Ag) (Bi, Cu, Pb, Zn) ± (Lefébure, 1996). The mineralization in the various tanks is not homogeneous, there preferential concentration of Nickeline, Pitchblende or sulphides of Cu-Pb - Zn, according to the site which is what matches the characteristics of the model (Hall and Stumpetl, 1973). In this sense Brodtkorb (1973) suggests some of the Sierra de Santa Victoria plumbiferos deposits could be linked to this model.
As a feature of these sites stands the lack of local direct link with intrusive. The district may appear especially diabase. According to Hall (1972) configured a subtype of deposits As and AG. The presence of Ag in the Nickeline is scarce, not the As promptly reaching 26% as well.
The mineralizations may be linked to basic rocks, Granites or with fractures deep. Basic rocks are manifested in the region (Rubiolo, 1996) even when the presence of U would indicate a granitofila origin. Brodtkorb (1973) pointed out that described deposits are linked to a single cycle metalogenic. According to Sureda et al. (1986) and Rubiolo (1996) correspond to the alkaline cycle occurred in the Upper Cretaceous-Eoceno. Position geotectonic for these authors, coincides with that indicated by Lefébure (1996) for this model of deposits, would respond to a metalotecto in correspondence with a geological environment under tectonic reef intracratonic or a zone of traction-elongation of existing transarco during this period, with the possible existence of a remarkable cortical thinning (Rubiolo, 1996).


Regions containing this locality

South America PlateTectonic Plate
South AmericaContinent

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


17 valid minerals.

Detailed Mineral List:

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: C. S. Lurgo Mayón (1999). Depósitos polimetálicos ricos en Níquel, Cobalto y Arsénico de la cordillera oriental, Jujuy y Salta.
Chalcocite
Formula: Cu2S
Reference: C. S. Lurgo Mayón (1999). Depósitos polimetálicos ricos en Níquel, Cobalto y Arsénico de la cordillera oriental, Jujuy y Salta.
Chalcopyrite
Formula: CuFeS2
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: C. S. Lurgo Mayón (1999). Depósitos polimetálicos ricos en Níquel, Cobalto y Arsénico de la cordillera oriental, Jujuy y Salta.
Galena
Formula: PbS
Reference: C. S. Lurgo Mayón (1999). Depósitos polimetálicos ricos en Níquel, Cobalto y Arsénico de la cordillera oriental, Jujuy y 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.
Gold
Formula: Au
Reference: C. S. Lurgo Mayón (1999). Depósitos polimetálicos ricos en Níquel, Cobalto y Arsénico de la cordillera oriental, Jujuy y Salta.
Nickeline
Formula: NiAs
Reference: C. S. Lurgo Mayón (1999). Depósitos polimetálicos ricos en Níquel, Cobalto y Arsénico de la cordillera oriental, Jujuy y Salta.
Pyrite
Formula: FeS2
Reference: C. S. Lurgo Mayón (1999). Depósitos polimetálicos ricos en Níquel, Cobalto y Arsénico de la cordillera oriental, Jujuy y Salta.
Quartz
Formula: SiO2
Reference: C. S. Lurgo Mayón (1999). Depósitos polimetálicos ricos en Níquel, Cobalto y Arsénico de la cordillera oriental, Jujuy y Salta.
Rammelsbergite
Formula: NiAs2
Reference: C. S. Lurgo Mayón (1999). Depósitos polimetálicos ricos en Níquel, Cobalto y Arsénico de la cordillera oriental, Jujuy y Salta.
Silver
Formula: Ag
Reference: C. S. Lurgo Mayón (1999). Depósitos polimetálicos ricos en Níquel, Cobalto y Arsénico de la cordillera oriental, Jujuy y Salta.
Sphalerite
Formula: ZnS
Reference: C. S. Lurgo Mayón (1999). Depósitos polimetálicos ricos en Níquel, Cobalto y Arsénico de la cordillera oriental, Jujuy y Salta.
Tennantite
Formula: Cu6Cu4(Fe2+,Zn)2As4S12S
Reference: C. S. Lurgo Mayón (1999). Depósitos polimetálicos ricos en Níquel, Cobalto y Arsénico de la cordillera oriental, Jujuy y Salta.
Tetrahedrite
Formula: Cu6Cu4(Fe2+,Zn)2Sb4S12S
Reference: C. S. Lurgo Mayón (1999). Depósitos polimetálicos ricos en Níquel, Cobalto y Arsénico de la cordillera oriental, Jujuy y Salta.
Uraninite
Formula: UO2
Reference: C. S. Lurgo Mayón (1999). Depósitos polimetálicos ricos en Níquel, Cobalto y Arsénico de la cordillera oriental, Jujuy y Salta.
Uraninite var: Pitchblende
Formula: UO2
Reference: C. S. Lurgo Mayón (1999). Depósitos polimetálicos ricos en Níquel, Cobalto y Arsénico de la cordillera oriental, Jujuy y Salta.

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
Gold1.AA.05Au
Silver1.AA.05Ag
Group 2 - Sulphides and Sulfosalts
Bornite2.BA.15Cu5FeS4
Chalcocite2.BA.05Cu2S
Chalcopyrite2.CB.10aCuFeS2
Covellite2.CA.05aCuS
Galena2.CD.10PbS
Gersdorffite2.EB.25NiAsS
Nickeline2.CC.05NiAs
Pyrite2.EB.05aFeS2
Rammelsbergite2.EB.15aNiAs2
Sphalerite2.CB.05aZnS
Tennantite2.GB.05Cu6Cu4(Fe2+,Zn)2As4S12S
Tetrahedrite2.GB.05Cu6Cu4(Fe2+,Zn)2Sb4S12S
Group 4 - Oxides and Hydroxides
Quartz4.DA.05SiO2
Uraninite4.DL.05UO2
var: Pitchblende4.DL.05UO2
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
Baryte7.AD.35BaSO4

List of minerals arranged by Dana 8th Edition classification

Group 1 - NATIVE ELEMENTS AND ALLOYS
Metals, other than the Platinum Group
Gold1.1.1.1Au
Silver1.1.1.2Ag
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
Nickeline2.8.11.1NiAs
Sphalerite2.8.2.1ZnS
AmBnXp, with (m+n):p = 1:1
Chalcopyrite2.9.1.1CuFeS2
AmBnXp, with (m+n):p = 1:2
Gersdorffite2.12.3.2NiAsS
Pyrite2.12.1.1FeS2
Rammelsbergite2.12.2.12NiAs2
Group 3 - SULFOSALTS
3 <ø < 4
Tennantite3.3.6.2Cu6Cu4(Fe2+,Zn)2As4S12S
Tetrahedrite3.3.6.1Cu6Cu4(Fe2+,Zn)2Sb4S12S
Group 5 - OXIDES CONTAINING URANIUM OR THORIUM
AXO2·xH2O
Uraninite5.1.1.1UO2
Group 28 - ANHYDROUS ACID AND NORMAL SULFATES
AXO4
Baryte28.3.1.1BaSO4
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Unclassified Minerals, Mixtures, etc.
Uraninite
var: Pitchblende
-UO2

List of minerals for each chemical element

OOxygen
O Uraninite (var: Pitchblende)UO2
O QuartzSiO2
O BaryteBaSO4
O UraniniteUO2
SiSilicon
Si QuartzSiO2
SSulfur
S PyriteFeS2
S ChalcociteCu2S
S BorniteCu5FeS4
S ChalcopyriteCuFeS2
S GalenaPbS
S TetrahedriteCu6Cu4(Fe2+,Zn)2Sb4S12S
S TennantiteCu6Cu4(Fe2+,Zn)2As4S12S
S CovelliteCuS
S SphaleriteZnS
S BaryteBaSO4
S GersdorffiteNiAsS
FeIron
Fe PyriteFeS2
Fe BorniteCu5FeS4
Fe ChalcopyriteCuFeS2
Fe TetrahedriteCu6Cu4(Fe2+,Zn)2Sb4S12S
Fe TennantiteCu6Cu4(Fe2+,Zn)2As4S12S
NiNickel
Ni NickelineNiAs
Ni RammelsbergiteNiAs2
Ni GersdorffiteNiAsS
CuCopper
Cu ChalcociteCu2S
Cu BorniteCu5FeS4
Cu ChalcopyriteCuFeS2
Cu TetrahedriteCu6Cu4(Fe2+,Zn)2Sb4S12S
Cu TennantiteCu6Cu4(Fe2+,Zn)2As4S12S
Cu CovelliteCuS
ZnZinc
Zn TetrahedriteCu6Cu4(Fe2+,Zn)2Sb4S12S
Zn TennantiteCu6Cu4(Fe2+,Zn)2As4S12S
Zn SphaleriteZnS
AsArsenic
As NickelineNiAs
As RammelsbergiteNiAs2
As TennantiteCu6Cu4(Fe2+,Zn)2As4S12S
As GersdorffiteNiAsS
AgSilver
Ag SilverAg
SbAntimony
Sb TetrahedriteCu6Cu4(Fe2+,Zn)2Sb4S12S
BaBarium
Ba BaryteBaSO4
AuGold
Au GoldAu
PbLead
Pb GalenaPbS
UUranium
U Uraninite (var: Pitchblende)UO2
U UraniniteUO2

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.
C. S. Lurgo Mayón (1999). Depósitos polimetálicos ricos en Níquel, Cobalto y Arsénico de la cordillera oriental, Jujuy y Salta.
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 Purísima, Rumicruz y La Esperanza. Revista de la Asociación Geológica Argentina, 28 (4): 364-368.
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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