This article has been reviewed according to Science X's editorial process and policies. Editors have highlighted the following attributes while ensuring the content's credibility: For thousands of years, humans shaped their world with stone, wood and bone. Metallurgy, the art and science of working with metals such as copper, bronze and iron, marked a turning point in human history.
The mining that fueled metalworking also shaped Europe's and the Mediterranean's economies and politics over centuries. A recent study found clues that helped reconstruct the region's 6,000-year history of lead and silver mining, metal production and trade, a task hindered by scattered archaeological evidence. This was possible because peat bogs act like nature's archive.
As these wetlands slowly build up, they capture airborne dust layer by layer, preserving a record of fallout from silver mining over centuries. In this study, researchers drilled a peat core at Pilat Massif, an upland area of south-central France. By studying lead (Pb) isotope signatures preserved in peatlands alongside data from the reference Pb Isotope database, researchers developed the Environmental Match Intensity Index (EMII), which revealed that the earliest major lead-silver mining signal emerged during the Late Neolithic and Chalcolithic periods (3700–2200 B.C.), centered around Laurion and the Cycladic islands in Greece.
The findings are published in Science Advances. Contrary to popular belief, Rome did not rely almost exclusively on Spanish mines. The Iron Age brought changes in mining, and the study showed that mines across France, Germany and Britain also provided major, continuous supplies.
Activity was spread across multiple centers in west-central Europe, linked by major rivers and a network of land and sea routes. Lead and silver often occur together in nature in a mineral ore called galena (PbS). Since silver was an essential metal for coins and trade, ancient societies smelted galena to extract the precious metal, which released a significant amount of lead into the atmosphere.
Natural bodies like peatlands, lake sediments and polar ice cores trap airborne lead fallout in continuous layers year after year. This creates an archive of lead pollution that preserves subtle details and provides a chronological record of major events in the region, both natural and human-made. Scientists use the signatures left by the pollutant centuries ago to trace the history of silver production and past metallurgical activity.
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