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Josefa-Veneros vein (Josefa-Veneros Norte vein), Coroña de Arriba-La Collada, La Collada mining area, Siero, Asturias, Spaini
Regional Level Types
Josefa-Veneros vein (Josefa-Veneros Norte vein)Vein
Coroña de Arriba-La Collada- not defined -
La Collada mining areaArea
Siero- not defined -
AsturiasAutonomous Community

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Latitude & Longitude (WGS84):
43° 26' 8'' North , 5° 37' 50'' West (est.)
Estimate based on other nearby localities or region boundaries.
Margin of Error:
Locality type:
Name(s) in local language(s):
Filón Josefa-Veneros (Filón Josefa-Veneros Norte), Coroña de Arriba-La Collada, Zona minera de la Collada, Siero, Asturias, España

According the book: "La Fluorita. Un Siglo de Minería de Asturias" it is more accurate to use the name Josefa-Veneros vein instead the Josefa-Veneros Norte vein. The old name is kept in brackets because it has been widely used (both in collections and in literature).


This vein is basically parallel to the Collada vein. Its production began in the 1920s, initially at the northern end via an open pit within the Basurto claim and then, circa 1940, from the southern end, in the outskirts of la Collada, by the “La Audacia Minera” company via the “Josefa” Mine (43º 25’ 59,10’’ N; 5º 37’ 22,86’’ W).

During the 1960s the rights to these mining properties were leased to Fluoruros S.A. This company increased the level of activity by opening the Veneros-Sur open pit (43º 25’ 54,54’’ N; 5º 37’ 30,66’’ W), the Coroña shaft, (43º 26’ 8,04’’ N; 5º 37’ 51,20’’ W) and also by opening the connecting gallery on the 75 level of the mine between the Collada and Josefa veins. The Josefa mine was also re-named Veneros mine.

The mineralogical characteristics of the Josefa-Veneros vein are similar to the Collada vein, presenting the classical paragenesis of Fluorite-Calcite and from time to time the traces of small amounts of sulfides, pyrites, etc...

In the Coroña shaft area (north of this vein) there is a greater frequency of scalenohedral calcite, with samples that reach up to 25 cm. The color of these scalenohedrons vary from clay-white to transparent amber. The samples of fluorite that appear here are small cubes with less than 1 cm edge. As one heads south the size of the calcite diminishes and there is an increase in the size of the groups of fluorite cubes which are of a blue-violet color and that culminate in the famous "pockets" found within the level 75 connecting gallery with their crystals of fluorite over calcite showing a combination of cubes and dodecahedron, which in some cases present a lighter or clearer color on the faces of the cubes and a more intense color in the faces of the rombododecahedron. This makes them very attractive.

Regions containing this locality

Eurasian PlateTectonic Plate
Iberian PeninsulaPeninsula

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Standard Detailed Strunz Dana Chemical Elements

Mineral List

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

5 valid minerals.

Detailed Mineral List:

Formula: CaCO3
Description: Large crystals associated to fluorite
Reference: Calvo, Miguel. (2012). Minerales y Minas de España. Vol. V. Carbonatos y Nitratos. Boratos. Escuela Técnica Superior de Ingenieros de Minas de Madrid. Fundación Gómez Pardo. 711 págs.
Formula: CuFeS2
Reference: Jordi Fabre
Formula: CaF2
Reference: Calvo, Miguel. (2006). Minerales y Minas de España. Vol. III. Halogenuros. Museo de Ciencias Naturales de Alava. Vitoria. 267 págs.
Formula: FeS2
Reference: Jordi Fabre
Formula: SiO2
Reference: Jordi Fabre

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
Group 3 - Halides
Group 4 - Oxides and Hydroxides
Group 5 - Nitrates and Carbonates

List of minerals arranged by Dana 8th Edition classification

Group 2 - SULFIDES
AmBnXp, with (m+n):p = 1:1
AmBnXp, with (m+n):p = 1:2
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si

List of minerals for each chemical element

C CalciteCaCO3
O CalciteCaCO3
O QuartzSiO2
F FluoriteCaF2
Si QuartzSiO2
S ChalcopyriteCuFeS2
S PyriteFeS2
Ca FluoriteCaF2
Ca CalciteCaCO3
Fe ChalcopyriteCuFeS2
Fe PyriteFeS2
Cu ChalcopyriteCuFeS2


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.

External Links (explanations about the complex structure of the area with maps, in Spanish language)

Localities in this Region

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