Emilio Mine

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Loroñe, Obdulia vein, Colunga, Asturias, Spain

Mina Emilio, Loroñe, Filón Obdulia, Colunga, Zona minera de Caravia, Asturias, España

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Key Information

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  • The Emilio Mine is in Loroñe, Colunga, Asturias, Spain, a region known for its natural beauty and mining history.

  • It produces fluorite, often with unique colors and inclusions, alongside calcite, baryte, and quartz.

  • The mine's geology features a 500m long, NW-SE oriented lode in sedimentary rocks, likely Permo-Triassic or Paleozoic.

  • Mining started in 1940 for kaolin, shifted to fluorite by 1989, and is still active with significant historical operations.

  • Colunga has a rich cultural heritage, including fishing villages and the Jurassic Museum of Asturias (MUJA).

  • The area has a maritime climate with mild temperatures (around 12.9°C annually) and high rainfall (1402mm yearly), supporting diverse ecosystems.

Geographic Location

The Emilio Mine is nestled in Loroñe, part of the Obdulia parish in Colunga, Asturias, Spain. Asturias, in northern Spain, is renowned for its rugged coastlines, mountains, and lush greenery, often called "Green Spain." The mine is near the coastal town of Colunga, with coordinates at 43° 27' 28'' North, 5° 13' 22'' West, placing it in the central part of Asturias, close to the Cantabrian Sea. Nearby, Caravia, another small town, is known for its beaches and the Sierra del Sueve, adding to the region's appeal for mineral enthusiasts exploring the area.

Minerals Produced

The Emilio Mine is famous for its fluorite, which ranges from colorless to deep violet and often contains intriguing inclusions like cinnabar, sphalerite, pyrite, and chalcopyrite, as well as organic and hydrocarbon traces. This makes it a treasure trove for collectors seeking unique specimens. Other minerals found here include calcite, baryte, and quartz, with recent discoveries of double-terminated quartz crystals up to 20cm, prized for their transparency and luster.

Geological Structure and Mining History

The mine's mineralized lode stretches 500m in a northwest-southeast direction, with an average width of 1.5m, hosted in sedimentary rocks, likely from the Permo-Triassic or Paleozoic periods, such as sandstones and limestones. Mining began in 1940 for kaolin extraction, but by 1965, it shifted focus to fluorite, with significant developments including a shaft renovation and confirmation of the lode's extent. By 1985, Minersa took over, installing processing plants and extracting about 4 million tons of mineral, with galleries extending over 60km. The operation transitioned fully to fluor spar by 1989, and between 2005-2009, it yielded unique quartz crystal pockets, enhancing its reputation.

Local Culture and Characteristics

Colunga and surrounding areas are steeped in history, with evidence of Paleolithic, Roman, and medieval settlements. The fishing village of Lastres, part of Colunga, won the "Exemplary Town of Asturias Award" in 2010 for its cultural preservation. The Jurassic Museum of Asturias (MUJA) mindat.org in Colunga is a highlight, showcasing the region's paleontological significance, making it a fascinating stop for visitors interested in both minerals and history.

Climate and Ecology

Asturias enjoys a maritime climate, and in Colunga, the average annual temperature is around 12.9°C, with significant rainfall of about 1402mm yearly. This climate supports diverse ecosystems, including coastal flora and fauna, forests, and mountain habitats, contributing to the region's lush landscapes and providing a rich backdrop for mineral exploration.