Josefa-Veneros vein (Josefa-Veneros Norte vein), Coroña de Arriba-La Collada, La Collada mining area, Siero, Asturias, Spain

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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).

JOSEFA-VENEROS VEIN

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.

Mineral List

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

Calcite Chalcopyrite

Fluorite Pyrite

Quartz

9 entries listed. 5 valid minerals.

Localities in this Region

Spain Asturias Siero La Collada mining area Coroña de Arriba-La Collada Josefa-Veneros vein (Josefa-Veneros Norte vein) Basurto Mine Coroña shaft Veneros-Sur open pit

References

External Links