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Farallon Blanco Mine, Sierra de La Ramada, La Ramada y La Cruz, Burruyacú Department, Tucumán Province, Argentinai
Regional Level Types
Farallon Blanco MineMine
Sierra de La RamadaSierra
La Ramada y La CruzMunicipality
Burruyacú DepartmentDepartment
Tucumán ProvinceProvince
ArgentinaCountry

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Key
Latitude & Longitude (WGS84):
26° 35' 20'' South , 64° 55' 3'' West
Latitude & Longitude (decimal):
Locality type:
Nearest Settlements:
PlacePopulationDistance
Burruyacú2,037 (2015)20.1km
Alderetes38,466 (2016)33.2km
Tafí Viejo48,459 (2016)37.5km
San Miguel de Tucumán781,023 (2016)40.0km
Yerba Buena50,783 (2016)47.0km


Veins of Calcite of hydrothermal origin appear on the eastern slope of the Sierra of the Ramada, upper area of the River El Naranjito in the Burruyacú Department some 50 kilometres from the city of San Miguel de Tucumán. All the veins meet searches made, carried out in the main the work of exploration in search of gold and silver ores, denounced as "Farallón Blanco".

It's veins of calcite on manifest schist slates, forming long streaks of variable power, since some as up over 11 meters, direction predominantly N.W. to S.E. and inclinations ranging from 86° to 40°, discordant with the direction of the schist. The area is covered by thick vegetation, having noted the presence of at least 10 veins of calcite.

The result of analysis carried out indicates that the reefs are composed of calcium carbonate, sufficiently pure to produce good quality lime, being the quality of the ore of the main vein of a lower percentage of calcium carbonate, containing a certain percentage of silica and iron salts, in part also manganoan.

The work of exploration that made the mining Department of the National University of Tucumán, materialized to the deepening of a master well, to explore the Gold - Silver possibilities for the main vein of calcite.

Geological history:
"Farallón Blanco" is located on the eastern slope of the Sierra de La Ramada, Department of Burruyacú, province of Tucumán. The Sierra de La Ramada, along with the field, Medina and Nogalito form the so-called Sierras of the northeast of Tucuman, belonging to the subsystem Santa Barbara. The mountains consist of shale and grey Slate of the Medina formation of Precambrian-Eocambrian age and the granite stock Rodeo de Funes of possibly Paleozoic age. There is also El Cadillal formation reddish Cretaceous conglomerates. This unit is intercalated traquitas and basbelonging to the high complex high in the Salinas. The Tertiary is represented by reddish sandstones (Loro river formation), green chalky pelites, oolitic limestone ( Nio River formation), siltstones and reddish and greenish argillites (Salí river formation). Complete the Columbiana fanglomerates, conglomerates and deposits fluvial Quaternary terraced. The Sierra de La Ramada is structurally a large anticline whose core is formed by metamorphites of the formation Medina. Calcite veins are located at both sides of the Gorge of the River El Naranjito located in the metamorphites. Calcite in the form of veins and veins located in the metamorphic basement has address predominant WNW - ESE. There are two types (white and grey), differentiated by colour and aspect to ultraviolet light. The main grain is sparry added with crystals of up 50 mm of scalenohedral form. It has been recognized by underground workings, approximately 90 m run with a thickness gave 1.5 m. The dominant position is 110 ° NE inclination 70 ° - 80 ° SW. In the area, there are lots of veins of quartz in position matching or discordant with the main plane of cleavage of the metamorphites. Under the microscope, the quartz has fragments extinction with black spots and reddish oxide of iron and manganese. Calcite veins pass through quartz. Is the little metal mineralization of gold, pyrite and chalcopyrite. Gold varies between 2 and 10 µ in some cases reaches 20µ, their edges are smooth, sharp or rounded. They are distributed both in the mass quartz and calcite. Pyrite is presented with oxides of manganese in aggregate irregular corroded edges. Chalcopyrite occurs in small individuals of size 10 to 20 µ. Found in veins of calcite with manganese oxide. Manganese is present as pyrolusite and psilomelane. Existing mining tilling has been realized by the Department of mining Affairs of the Universidad Nacional de Tucumán. There are two main tasks: a vertical pique of 25 m of depth on the left bank of the El Naranjito River and horizontal galleries on the right bank totalling 145 m of development. Is considered that the mineralization of calcites it is carbonated solutions product that circulated by pre-existing fractures of the basement and hydrothermal fluids were possibly linked to the lowest of the branch saw magmatism and the gold content in the veins of calcite could have been remobilized of veins quartz.

Primary mineralization:
Calcite - Manganoan calcite - quartz - native gold - pyrite - chalcopyrite - Pyrolusite - Psilomelane - manganese oxides - iron oxides.

Select Mineral List Type

Standard Detailed Gallery Strunz Dana Chemical Elements

Mineral List


9 valid minerals.

Detailed Mineral List:

Alumohydrocalcite
Formula: CaAl2(CO3)2(OH)4 · 4H2O
Habit: triclinic
Colour: pale blue
Reference: Raúl Jorge Tauber Larry´s collection.
Calcite
Formula: CaCO3
Colour: White, Yellowish, Redish, black, pink.
Fluorescence: Yellowish.
Description: Observed and Collected by Raúl Jorge Tauber Larry.
Reference: Raúl Tauber Larry´s collection. Ruiz, D. R., Ávila, J.C. & Lazarte, J.E. : Las vetas de calcita de Farrallón Blanco, Sierra de la Ramada, Tucumán. Facultad de Ciencias Naturales e Instituo Miguel Lillo. Miguel Lillo 205. 4000. Tucumán, Argentina. doraruiz10@hotmail.com2, CONICET.
Calcite var. Manganese-bearing Calcite
Formula: (Ca,Mn)CO3
Reference: Hugo A. Peña (1970) - Minerales y Rocas de Aplicación de Provincia de Tucumán. Dirección Provincial de Minas. Tucumán. República Argentina.
Chalcopyrite
Formula: CuFeS2
Reference: Dora L.Ruiz, Julio C. Ávila y José E. Lazarte.LAS VETAS DE CALCITA DE FARALLÓN BLANCO, SIERRA DE LA RAMADA, TUCUMÁN. Facultad de Ciencias Naturales e Instituo Miguel Lillo. Miguel Lillo 205. 4000. Tucumán, Argentina.doraruiz10@hotmail.com2, CONICET.
Gold
Formula: Au
Colour: golden
Fluorescence: no
Reference: Raúl Jorge Tauber Larry´s collection.Peña, H. A. (1970): Minerales y Rocas de Aplicación de la Provincia de Tucumán. Dirección Provincial de Minas. Tucumán.
'Limonite'
Colour: red-brown.
Reference: Raúl Jorge Tauber Larry´s collection.; Ruiz, D. R., Ávila, J.C. & Lazarte, J.E. (????): Las vetas de calcita de Farrallón Blanco, Sierra de la Ramada, Tucumán. Facultad de Ciencias Naturales e Instituo Miguel Lillo. Miguel Lillo 205. 4000. Tucumán, Argentina
'Manganese Oxides'
Reference: Ruiz, D. R., Ávila, J.C. & Lazarte, J.E. (????): Las vetas de calcita de Farrallón Blanco, Sierra de la Ramada, Tucumán. Facultad de Ciencias Naturales e Instituo Miguel Lillo. Miguel Lillo 205. 4000. Tucumán, Argentina
'Psilomelane'
Formula: Mn, O
Reference: Ruiz, D. R., Ávila, J.C. & Lazarte, J.E. (????): Las vetas de calcita de Farrallón Blanco, Sierra de la Ramada, Tucumán. Facultad de Ciencias Naturales e Instituo Miguel Lillo. Miguel Lillo 205. 4000. Tucumán, Argentina
Pyrite
Formula: FeS2
Colour: yellow golden
Reference: Ruiz, D. R., Ávila, J.C. & Lazarte, J.E. (????): Las vetas de calcita de Farrallón Blanco, Sierra de la Ramada, Tucumán. Facultad de Ciencias Naturales e Instituo Miguel Lillo. Miguel Lillo 205. 4000. Tucumán, Argentina
Pyrolusite
Formula: Mn4+O2
Reference: Ruiz, D. R., Ávila, J.C. & Lazarte, J.E. (????): Las vetas de calcita de Farrallón Blanco, Sierra de la Ramada, Tucumán. Facultad de Ciencias Naturales e Instituo Miguel Lillo. Miguel Lillo 205. 4000. Tucumán, Argentina
Quartz
Formula: SiO2
Reference: Dora L.Ruiz, Julio C. Ávila y José E. Lazarte.LAS VETAS DE CALCITA DE FARALLÓN BLANCO, SIERRA DE LA RAMADA, TUCUMÁN. Facultad de Ciencias Naturales e Instituo Miguel Lillo. Miguel Lillo 205. 4000. Tucumán, Argentina.doraruiz10@hotmail.com2, CONICET.
Silver
Formula: Ag
Reference: Peña, H. A. (1970): Minerales y Rocas de Aplicación de la Provincia de Tucumán. Dirección Provincial de Minas. Tucumán.
Sphalerite
Formula: ZnS
Habit: Isometric
Colour: Translucent brown
Reference: Raúl Jorge Tauber Larry´s collection.

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
Gold1.AA.05Au
Silver1.AA.05Ag
Group 2 - Sulphides and Sulfosalts
Chalcopyrite2.CB.10aCuFeS2
Pyrite2.EB.05aFeS2
Sphalerite2.CB.05aZnS
Group 4 - Oxides and Hydroxides
Pyrolusite4.DB.05Mn4+O2
Quartz4.DA.05SiO2
Group 5 - Nitrates and Carbonates
Alumohydrocalcite5.DB.05CaAl2(CO3)2(OH)4 · 4H2O
Calcite5.AB.05CaCO3
var. Manganese-bearing Calcite5.AB.05(Ca,Mn)CO3
Unclassified Minerals, Rocks, etc.
'Limonite'-
'Manganese Oxides'-
'Psilomelane'-Mn, O

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
AmXp, with m:p = 1:1
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 4 - SIMPLE OXIDES
AX2
Pyrolusite4.4.1.4Mn4+O2
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Calcite14.1.1.1CaCO3
Group 16b - HYDRATED CARBONATES CONTAINING HYDROXYL OR HALOGEN
Alumohydrocalcite16b.2.3.1CaAl2(CO3)2(OH)4 · 4H2O
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Unclassified Minerals, Mixtures, etc.
Calcite
var. Manganese-bearing Calcite
-(Ca,Mn)CO3
'Limonite'-
'Manganese Oxides'-
'Psilomelane'-Mn, O

List of minerals for each chemical element

HHydrogen
H AlumohydrocalciteCaAl2(CO3)2(OH)4 · 4H2O
CCarbon
C CalciteCaCO3
C AlumohydrocalciteCaAl2(CO3)2(OH)4 · 4H2O
C Calcite var. Manganese-bearing Calcite(Ca,Mn)CO3
OOxygen
O CalciteCaCO3
O AlumohydrocalciteCaAl2(CO3)2(OH)4 · 4H2O
O Calcite var. Manganese-bearing Calcite(Ca,Mn)CO3
O QuartzSiO2
O PyrolusiteMn4+O2
O PsilomelaneMn, O
AlAluminium
Al AlumohydrocalciteCaAl2(CO3)2(OH)4 · 4H2O
SiSilicon
Si QuartzSiO2
SSulfur
S PyriteFeS2
S ChalcopyriteCuFeS2
S SphaleriteZnS
CaCalcium
Ca CalciteCaCO3
Ca AlumohydrocalciteCaAl2(CO3)2(OH)4 · 4H2O
Ca Calcite var. Manganese-bearing Calcite(Ca,Mn)CO3
MnManganese
Mn Calcite var. Manganese-bearing Calcite(Ca,Mn)CO3
Mn PyrolusiteMn4+O2
Mn PsilomelaneMn, O
FeIron
Fe PyriteFeS2
Fe ChalcopyriteCuFeS2
CuCopper
Cu ChalcopyriteCuFeS2
ZnZinc
Zn SphaleriteZnS
AgSilver
Ag SilverAg
AuGold
Au GoldAu

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Bossi, G. (1969) Geología y Estratigrafía del sector sur del valle de Choromoro. Acta Geológica Lilloana: 10(2): 19-61. San Miguel de Tucumán.
Peña, H.A. (1970) Minerales y Rocas de Aplicación de la Provincia de Tucumán. Dirección Provincial de Minas. Tucumán.
Tauber Larry, Raúl Jorge (1970) Reporte personal de la visita a Farallón Blanco.
Mon, R., Urdaneta, A., Suayter, L. (1971) Estudio Geológico de las Sierras del Campo y La Ramada (Provincia de Tucumán). Acta Geológica Lilloana: 11(15): 291-306, 2 figs., 1 map. Fundación e Instituto Miguel Lillo, Universidad Nacional de Tucumán.
Alderete, M.C. (1984) Unidades Fisiográficas. En: Aceñolaza, F., Bossi, G., Toselli, A. (Ed.) (1984) Geología de Tucumán. Colegio de graduados en Ciencias Geológicas de Tucumán: 19-28. San Miguel de Tucumán.
Ávila, J.C., Lazarte, J.E. (1984) Presencia de oro en las vetas de cuarzo del basamento metamórfico de la sierra de La Ramada, Provincia de Tucumán. 9º Congreso Geológico Argentino, Actas: 5: 565-574. Buenos Aires.
Farías. E. (1992) Relevamiento y ubicación de los depósitos de calcáreo oolítico y yeso de las sierras del departamento Burruyacú. Dirección Provincial de Minería, Tucumán. Inédito.
Ávila, J., Lazarte, J.E., Gianfrancisco, M., Fogliata, A.S. (1999) Yacimientos de caliza sedimentaria y calcita hidrotermal, Tucumán. SEGEMAR, Anales: 35.
Ruiz, D.R., Ávila, J.C., Lazarte, J.E. (xxxx) Las vetas de calcita de Farrallón Blanco, Sierra de la Ramada, Tucumán. Facultad de Ciencias Naturales e Instituo Miguel Lillo. Miguel Lillo 205. 4000. Tucumán, Argentina. doraruiz10@hotmail.com2, CONICET.

Other Regions, Features and Areas containing this locality

South AmericaContinent
South America PlateTectonic Plate

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