The mines of Laurion had been worked since at least the late Neolithic, around 3200 BCE — isotopic traces of Laurion lead turn up in Mycenaean bronze-age objects scattered across Greece. But the scale that changed history came in the 5th century BCE, when Athens began systematically exploiting a new and unprecedentedly rich contact between marble and schist deep beneath the Attic hillsides.

Around 700 ancient mine shafts have been discovered at Laurion, along with some 200 ore-processing stations where silver was separated from lead. The ore traveled on the backs of workers, most of them enslaved, from the dark of the galleries to the washing tables on the surface. Estimates suggest nearly 20,000 enslaved people worked these mines at the height of their productivity — extracting ore, hauling it, washing it in sluice troughs fed by carefully engineered cisterns, and heating it in furnaces to separate lead from silver. The silver content of the raw ore was only 0.1 percent. The rest was labor.

The source article puts it plainly: these were men and an unknown number of children, "chained, naked, and branded," working ore seams "illuminated only by guttering oil lamps." It was, in the words of the ancient record, "a miserable, dangerous, and brief life."

They were not a faceless mass. They were people with bodies that bent under loads, lungs that filled with rock dust, and eyes that adjusted over years to almost total darkness. Their names are mostly lost, as enslaved people's names usually are. But their work produced 100 talents of silver — roughly 2.6 tonnes — at exactly the moment Athens needed it most. When the Persian fleet was marshaling for its second invasion in 480 BCE, the statesman Themistocles persuaded the Athenians not to distribute this windfall among themselves but to build a fleet. The 200 triremes that Laurion silver built met the Persians at Salamis. Greece did not fall. Athens rebuilt.

The mines' story did not end with the Golden Age. They continued operating, with interruptions from war and exhaustion, through the Hellenistic period and into Roman times, when enslaved people at Laurion joined large-scale revolts around the time of Rome's Second Servile War (104–100 BCE). Sulla's siege and sack of Athens in 87–86 BCE ended mining for centuries.

In 1864, the mines reopened under a private company. Renewed extraction processed both fresh ore and ancient slag heaps left by classical miners. Zinc and lead fueled commercially significant operations into the 20th century; iron ore continued into the 1950s; the last profitable sulfide deposits were exhausted in 1978. But the 19th-century revival had its own violence. In 1896, a miners' strike was met by company guards, and four workers were killed. The miners responded by destroying company offices. The government sent police, then military. More workers died. The demands went largely unmet, and a permanent military garrison was stationed at the mines.

The geology beneath Laurion is extraordinary in its own right. The silver deposits formed at three distinct contacts where layers of Kamariza marble meet schist — a sequence of lead, zinc, and silver sulfide minerals laid down in the deep past through metamorphic and marine transgressive episodes. The landscape itself still bears the marks of antiquity: ancient spoil heaps, the depressions of filled shafts, the circular outlines of ore-washing stations visible from the air. The Mineralogical Museum of Lavrion now holds the mineral collection; hiking trails let visitors walk the industrial archaeology of what was, for two centuries, perhaps the most consequential patch of ground in the ancient Mediterranean world.