All mines need regular reinforcement against collapse, and Hallstatt, the world’s oldest salt mine in the Austrian Alps, is no exception — but Hallstatt is not like other mines.
Exploited for 7,000 years, the mine has yielded not only a steady supply of salt, but also archeological discoveries attesting to the existence of a rich civilization dating to the early part of the first millennium BC.
So far, less than 2 percent of the prehistoric tunnel network is thought to have been explored, with the new round of reinforcement work, which began this month, protecting the dig’s achievements, chief archeologist Hans Reschreiter said.
“Like in all the mines, the mountain puts pressure on the tunnels and they could cave in if nothing is done,” Reschreiter said.
Towering over a natural lake — today frequented by masses of tourists, particularly from Asia, who come to admire the Alpine scenery — the Hallstatt mine lies more than 800m above sea level.
The vast deposit of sea salt inside was left by the ocean that covered the region about 250 million years ago.
Among the most striking archeological discoveries was that of an 8m-long wooden staircase dating to 1100 BC, the oldest such staircase found in Europe.
“It was so well preserved that we could take it apart and reassemble it,” Reschreiter said.
Other items date back much further. Excavated in 1838, an axe made from staghorn dating from 5000 BC showed that as early as then, miners “tried hard to extract salt from here,” Reschreiter said.
In the mid-19th century, excavations revealed a necropolis that showed the site’s prominence during the early Iron Age.
The civilization became known as “Hallstatt culture,” ensuring the site’s fame.
“Thousands of bodies have been excavated, almost all flaunting rich bronze ornaments, typically worn by only the wealthiest,” Reschreiter said. “The remains bore the marks of hard physical labor from childhood, while also showing signs of unequaled prosperity.”
Salt — long known as “white gold” — was priceless at the time, and Hallstatt produced up to 1 tonne every day, supplying “half of Europe,” Reschreiter said, adding that the difficult-to-access location “became the continent’s richest and a major platform for trading in 800 BC.”
Testifying to this are sword handles made of African ivory and Mediterranean wine bowls found at the site.
A second series of excavations — started by Vienna’s Museum of Natural History about 60 years ago — produced more surprises.
In tunnels more than 100m below the surface, archeologists discovered “unique evidence” of mining activity at an “industrial” scale during the Bronze Age, Reschreiter said.
As well as revealing wooden retaining structures more than 3,000 years old which were perfectly preserved by the salt, the excavation unearthed numerous tools, leather gloves and a rope — thick as a fist — as well as the remains of millions of wooden torches.
Also used by Celts and during the Roman era, when salt was used to pay legions stationed along the Danube River — it is the origin of the word “salary” — the mine has never stopped working since prehistoric times.
Today, about 40 people still work there, using high-pressure water to extract the equivalent of 250,000 tonnes of salt per year.
“Salt doesn’t have the same value as in antiquity anymore, but some of its new uses, such as in the pharmaceutical and chemical industries, are still highly profitable,” said Kurt Thomanek, technical director of salt supplier Salinen Austria.
Tourism linked to the archeological discoveries is also “a pillar of our activities,” Thomanek added.
Last year, about 200,000 people visited the mine.
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