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La Viesca Mine, Huergo, La Collada mining area, Siero, Asturias, Spaini
Regional Level Types
La Viesca MineMine
Huergo- not defined -
La Collada mining areaArea
Siero- not defined -
AsturiasAutonomous Community
SpainCountry

This page kindly sponsored by Chrysalis - Erik Thomas
Key
Latitude & Longitude (WGS84):
43° 26' 29'' North , 5° 36' 29'' West
Latitude & Longitude (decimal):
Locality type:
Nearest Settlements:
PlacePopulationDistance
Pola de Siero12,615 (2018)7.1km
Negales147 (2018)7.3km
Sariego1,367 (2012)7.6km
Noreña4,647 (2012)9.6km
Arriba2,030 (2012)10.2km
Name(s) in local language(s):
Mina La Viesca, Huergo, Zona minera de La Collada, Siero, Asturias, España


LA VIESCA MINE

La Viesca Mine, which is currently owned by Preparación Minera del Norte - Preminor S. L., is located near the town of Huergo, at km. 13 of the As-248 road, in a hollow known by the villagers by the same name. (43º 26’ 27,77’’ N; 5º 36’ 46,58’’ W).

The first company which obtained rights to work this concession was Felgueroso Hermanos, who were Asturian entrepreneurs closely related to coal mining. Although this mining concession was originally made for coal, it was always mined for Fluor spar, firstly by Fluoruros S.A. and then by the current owner, Preminor S. L.

In 2004, after a long period of inactivity, the mine workings started again by Preminor, through an inclined ramp that now measures about 5 km.

The main crystalline shapes from this locality are cubic, however rhombododecahedron faces can be found as well, but with more limited development than in La Collada. Specimens with icositetrahedron and tetrahexahedron habit have been seen on rare occasions. What is common is the appearance on the faces of the cube of intergrowths that cause rather complex mosaic surfaces producing a loss of brilliance of the crystals due to the optical effect of the reflections.

The most frequent paragenesis is a combination of Fluorite with Calcite, Quartz, Dolomite and various sulfides (Sphalerite, Pyrite, Chalcopyrite, Galena, etc). In the finds made here, the Fluorite features colors varying from absolute transparency to nearly black through all shades of blue and violet. The crystals can reach 30 cm. across.

The associated Calcite crystals, usually scalenohedrons, can also be large. The Calcite in this mine sometimes adopts very complex forms in combination with the rhombohedron providing pseudo-spherical crystals.

___________________________________________________

In may 2010 a pocket of worldclass fluorites was discovered. The pocket was baptised "Geoda de Las Monjas" and produced about 400 specimens, the largest one measured 70 x 70 cm and weighed 135 kg, and the smallest one 4 x 4 cm with a weight of 10 gr.

Regions containing this locality

Eurasian PlateTectonic Plate
EuropeContinent
Iberian PeninsulaPeninsula

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List

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

8 valid minerals.

Detailed Mineral List:

Calcite
Formula: CaCO3
Reference: Fluorite: The Collector's Choice. Extra Lapis English No. 9
Chalcopyrite
Formula: CuFeS2
Reference: Jordi Fabre
Dolomite
Formula: CaMg(CO3)2
Reference: Manuel Gutierrez Claverol, Carlos Luque Cabal, Jose Ramon Garcia Alvarez and Luis Miguel Rodriguez Terente (2009) La Fluorita - un siglo de mineria en Asturias. p155.
Fluorite
Formula: CaF2
Reference: -Gutiérrez, M., Luque, C., García, J.R. y Rodríguez, L.M. (2009). La Fluorita. Un Siglo de Minería de Asturias. Universidad de Oviedo.565 págs. - Fluorite: The Collector's Choice. Extra Lapis English No. 9; García Álvarez, J.R.(2011): Las Monjas: une géode de fluorine exceptionnelle de la mine La Viesca, Asturies, Espagne. Le Règne Minéral. 97: 7-10
Hematite
Formula: Fe2O3
Reference: Manuel Gutierrez Claverol, Carlos Luque Cabal, Jose Ramon Garcia Alvarez and Luis Miguel Rodriguez Terente (2009) La Fluorita - un siglo de mineria en Asturias. p112.
Pyrite
Formula: FeS2
Quartz
Formula: SiO2
Reference: Fluorite: The Collector's Choice. Extra Lapis English No. 9
Sphalerite
Formula: ZnS
Reference: Manuel Gutierrez Claverol, Carlos Luque Cabal, Jose Ramon Garcia Alvarez and Luis Miguel Rodriguez Terente (2009) La Fluorita - un siglo de mineria en Asturias. p155.

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
Chalcopyrite2.CB.10aCuFeS2
Pyrite2.EB.05aFeS2
Sphalerite2.CB.05aZnS
Group 3 - Halides
Fluorite3.AB.25CaF2
Group 4 - Oxides and Hydroxides
Hematite4.CB.05Fe2O3
Quartz4.DA.05SiO2
Group 5 - Nitrates and Carbonates
Calcite5.AB.05CaCO3
Dolomite5.AB.10CaMg(CO3)2

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 = 1:1
Chalcopyrite2.9.1.1CuFeS2
AmBnXp, with (m+n):p = 1:2
Pyrite2.12.1.1FeS2
Group 4 - SIMPLE OXIDES
A2X3
Hematite4.3.1.2Fe2O3
Group 9 - NORMAL HALIDES
AX2
Fluorite9.2.1.1CaF2
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Calcite14.1.1.1CaCO3
AB(XO3)2
Dolomite14.2.1.1CaMg(CO3)2
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2

List of minerals for each chemical element

CCarbon
C CalciteCaCO3
C DolomiteCaMg(CO3)2
OOxygen
O QuartzSiO2
O CalciteCaCO3
O DolomiteCaMg(CO3)2
O HematiteFe2O3
FFluorine
F FluoriteCaF2
MgMagnesium
Mg DolomiteCaMg(CO3)2
SiSilicon
Si QuartzSiO2
SSulfur
S PyriteFeS2
S ChalcopyriteCuFeS2
S SphaleriteZnS
CaCalcium
Ca FluoriteCaF2
Ca CalciteCaCO3
Ca DolomiteCaMg(CO3)2
FeIron
Fe PyriteFeS2
Fe ChalcopyriteCuFeS2
Fe HematiteFe2O3
CuCopper
Cu ChalcopyriteCuFeS2
ZnZinc
Zn SphaleriteZnS

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
- Gutiérrez, M., Luque, C., García, J.R. y Rodríguez, L.M. (2009). La Fluorita. Un Siglo de Minería de Asturias. Universidad de Oviedo.565 págs.
- Calvo, M. (2006) Minerales y Minas de España. Vol. III. Halogenuros. Museo de Ciencias Naturales de Álava. 267 pp.
- García Álvarez, J.R. (2011): Las Monjas: une géode de fluorine exceptionnelle de la mine La Viesca, Asturies, Espagne. Le Règne Minéral. 97: 7-10

External Links

- http://www.mineral-forum.com/message-board/viewtopic.php?t=1753
The history of the finds (external and internal) made at the La Viesca Mine with description and pictures for each pocket. Written by José Ramón García & Jordi Fabre. Translation slightly abbreviated by James Catmur. To see the full Spanish text follow the link below

- http://www.foro-minerales.com/forum/viewtopic.php?t=5934 (original full text in Spanish language)


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