Las Médulas (Las Médulas)
Las Médulas is a historic gold-mining site near the town of Ponferrada in the comarca of El Bierzo (province of León, Castile and León, Spain). It was the most important gold mine, as well as the largest open-pit gold mine in the entire Roman Empire. Las Médulas Cultural Landscape is listed by UNESCO as a World Heritage Site. Advanced aerial surveys conducted in 2014 using LIDAR have confirmed the wide extent of the Roman-era works.
The spectacular landscape of Las Médulas resulted from the ruina montium (wrecking of the mountains), a Roman mining technique described by Pliny the Elder in 77 AD. The technique employed was a type of hydraulic mining which involved undermining a mountain with large quantities of water. The water was supplied by interbasin transfer. At least seven long aqueducts tapped the streams of the La Cabrera district (where the rainfall in the mountains is relatively high) at a range of altitudes. The same aqueducts were used to wash the extensive alluvial gold deposits.
What became the Roman province of Hispania Tarraconensis was conquered in 25 BC by the emperor Augustus. Before the Roman conquest, the indigenous inhabitants obtained gold from alluvial deposits. Large-scale production did not begin until the second half of the 1st century AD.
Pliny the Elder, who was a procurator in the region in 74 AD, described a technique of hydraulic mining that may be based on direct observation at Las Médulas: "What happens is far beyond the work of giants. The mountains are bored with corridors and galleries made by lamplight with a duration that is used to measure the shifts. For months, the miners cannot see the sunlight and many of them die inside the tunnels. This type of mine has been given the name of ruina montium. The cracks made in the entrails of the stone are so dangerous that it would be easier to find purpurine or pearls at the bottom of the sea than make scars in the rock. How dangerous we have made the Earth!"
Pliny also describes the methods used to wash the ores using smaller streams on riffle tables to enable the heavy gold particles to be collected. Detailed discussion of the methods of underground mining follows, once the alluvial placer deposits had been exhausted and the mother lode sought and discovered. Many such deep mines have been found in the mountains around Las Médulas. Mining would start with the building of aqueducts and tanks above the mineral veins, and a method called hushing used to expose the veins under the overburden.
The remains of such a system have been well studied at Dolaucothi Gold Mines, a smaller-scale site in South Wales. Opencast methods would be pursued by fire-setting, which involved building fires against the rock and quenching with water. The weakened rock could then be attacked mechanically and the debris swept away by waves of water. Only when all opencast work was uneconomical would the vein be pursued by tunneling and stoping.
Pliny also stated that 20,000 Roman pounds (6,560 kg) of gold were extracted each year. The exploitation, involving 60,000 free workers, brought 5,000,000 Roman pounds (1,640,000 kg) in 250 years.
The spectacular landscape of Las Médulas resulted from the ruina montium (wrecking of the mountains), a Roman mining technique described by Pliny the Elder in 77 AD. The technique employed was a type of hydraulic mining which involved undermining a mountain with large quantities of water. The water was supplied by interbasin transfer. At least seven long aqueducts tapped the streams of the La Cabrera district (where the rainfall in the mountains is relatively high) at a range of altitudes. The same aqueducts were used to wash the extensive alluvial gold deposits.
What became the Roman province of Hispania Tarraconensis was conquered in 25 BC by the emperor Augustus. Before the Roman conquest, the indigenous inhabitants obtained gold from alluvial deposits. Large-scale production did not begin until the second half of the 1st century AD.
Pliny the Elder, who was a procurator in the region in 74 AD, described a technique of hydraulic mining that may be based on direct observation at Las Médulas: "What happens is far beyond the work of giants. The mountains are bored with corridors and galleries made by lamplight with a duration that is used to measure the shifts. For months, the miners cannot see the sunlight and many of them die inside the tunnels. This type of mine has been given the name of ruina montium. The cracks made in the entrails of the stone are so dangerous that it would be easier to find purpurine or pearls at the bottom of the sea than make scars in the rock. How dangerous we have made the Earth!"
Pliny also describes the methods used to wash the ores using smaller streams on riffle tables to enable the heavy gold particles to be collected. Detailed discussion of the methods of underground mining follows, once the alluvial placer deposits had been exhausted and the mother lode sought and discovered. Many such deep mines have been found in the mountains around Las Médulas. Mining would start with the building of aqueducts and tanks above the mineral veins, and a method called hushing used to expose the veins under the overburden.
The remains of such a system have been well studied at Dolaucothi Gold Mines, a smaller-scale site in South Wales. Opencast methods would be pursued by fire-setting, which involved building fires against the rock and quenching with water. The weakened rock could then be attacked mechanically and the debris swept away by waves of water. Only when all opencast work was uneconomical would the vein be pursued by tunneling and stoping.
Pliny also stated that 20,000 Roman pounds (6,560 kg) of gold were extracted each year. The exploitation, involving 60,000 free workers, brought 5,000,000 Roman pounds (1,640,000 kg) in 250 years.
Map - Las Médulas (Las Médulas)
Map
Country - Spain
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Anatomically modern humans first arrived in the Iberian Peninsula around 42,000 years ago. The ancient Iberian and Celtic tribes, along with other pre-Roman peoples, dwelled the territory maintaining contacts with foreign Mediterranean cultures. The Roman conquest and colonization of the peninsula (Hispania) ensued, bringing the Romanization of the population. Receding of Western Roman imperial authority ushered in the migration of different non-Roman peoples from Central and Northern Europe with the Visigoths as the dominant power in the peninsula by the fifth century. In the early eighth century, most of the peninsula was conquered by the Umayyad Caliphate, and during early Islamic rule, Al-Andalus became a dominant peninsular power centered in Córdoba. Several Christian kingdoms emerged in Northern Iberia, chief among them León, Castile, Aragon, Portugal, and Navarre made an intermittent southward military expansion, known as Reconquista, repelling the Islamic rule in Iberia, which culminated with the Christian seizure of the Emirate of Granada in 1492. Jews and Muslims were forced to choose between conversion to Catholicism or expulsion, and eventually the converts were expelled through different royal decrees.
Currency / Language
ISO | Currency | Symbol | Significant figures |
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EUR | Euro | € | 2 |
ISO | Language |
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EU | Basque language |
CA | Catalan language |
GL | Galician language |
OC | Occitan language |
ES | Spanish language |