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Near Cabeza del Buey, archaeologists recorded six mine workings and found about 80 grooved stone axes beside one smaller trench.<\/p>\n
Reading those cuts as ore extraction, Johan Ling at the University of Gothenburg (GU<\/a>) built a program tracking 14 Iberian sites.<\/p>\n Because the mines held copper, lead, and silver, Ling\u2019s survey supplied the kind of physical setting the chemical evidence had lacked.<\/p>\n So the next question was no longer whether metal traveled north, but exactly where in Iberia it began.<\/p>\n Tracking bronze origins<\/p>\n Years before the Spanish survey, earlier analyses<\/a> had already shown that Swedish bronze did not match local copper ores.<\/p>\n Researchers reached that result by comparing metal chemistry with ore fields across Europe, then checking whether the numbers lined up.<\/p>\n Later, a follow-up study<\/a> on 71 Swedish objects pointed especially toward Iberia, Sardinia, and Alpine mining zones.<\/p>\n Spain therefore entered the story as a likely supplier, even though archaeologists still needed more mines on the ground.<\/p>\n Linking ore to artifacts<\/p>\n To pin the sources down, researchers then turned to lead isotopes, tiny variations in lead atoms, because ore bodies keep stable geological patterns.<\/p>\n When a bronze object and a mining district share that pattern, the comparison narrows the list of possible sources.<\/p>\n Chemistry helps again, since trace ingredients can separate two regions that look similar on isotopes alone.<\/p>\n Used together, those clues do not name a single pit with certainty, but they turn broad guesses into testable places.<\/p>\n Evidence of large mining<\/p>\n Fieldwork from the same research program soon widened the picture beyond the February survey in meaningful ways.<\/p>\n At Las Minillas<\/a>, excavators traced a 650-foot (198-meter) copper vein and logged 21 dates in the mine.<\/p>\n Radiocarbon, age estimates from decaying carbon, placed that work between roughly 1300 and 1000 B.C. and tied it to the later Bronze Age<\/a>.<\/p>\n Finds like that suggest southwestern Spain hosted industrial mining on a scale the old map never captured.<\/p>\n Signs of planning<\/p>\n The trenches themselves showed that miners were not skimming loose rock from the surface and walking away.<\/p>\n Long, narrow cuts followed the ore body, which meant workers knew where metal<\/a>-bearing stone lay underground.<\/p>\n Grooved hammerstones and evidence of fire-setting, cracking rock with intense heat, point to repeated labor rather than casual digging.<\/p>\n Those details make the Spanish sites look less like isolated holes and more like nodes in a managed economy.<\/p>\n Routes across seas<\/p>\n Metal still had to travel more than 1,500 miles (2,414 kilometers) to reach Scandinavia, so mines alone could never tell the whole story.<\/p>\n Boats moving along Atlantic coasts probably carried ore, ingots, or worked bronze through several exchange points.<\/p>\n Meanwhile, a broader article<\/a> on 550 metal analyses showed that Scandinavian supply routes shifted repeatedly over time.<\/p>\n One likely role for Spain was feeding a powerful phase of that traffic, not every shipment or every century.<\/p>\n Demand in Scandinavia<\/p>\n Imported copper changed what communities in the north could make, repair, and display in daily and ritual life.<\/p>\n Once metal arrived, local craftspeople mixed it with tin and recast it into swords, ornaments, and ceremonial gear.<\/p>\n Control over that flow helped ambitious leaders reward followers, stage alliances, and mark rank in visible ways.<\/p>\n Output from a mine in Spain therefore mattered far beyond Iberia, because it could strengthen power far to the north.<\/p>\n What remains uncertain<\/p>\n Even now, the Spanish discoveries do not prove that Scandinavian traders sailed directly to these exact valleys.<\/p>\n Ore<\/a> could have moved through middlemen, and finished objects may have been melted and recast several times.<\/p>\n Isotopic matches can narrow a search to districts or more families, yet they rarely identify one shaft alone.<\/p>\n For that reason, excavation, dating, and ore sampling still matter as much as chemistry in this case.<\/p>\n The larger map<\/p>\n Ling thinks the newly logged mines<\/a> are only a fraction of what remains buried across Extremadura and neighboring Andalusia.<\/p>\n \u201cThe discovery of the new Bronze Age mines in Extremadura represents only the tip of the iceberg,\u201d said Ling.<\/p>\n He estimated that as many as 150 prehistoric mines in Extremadura and Andalusia may still await documentation.<\/p>\n If that estimate is close, Europe\u2019s Bronze Age<\/a> metal economy looked denser, harsher, and more organized than the surviving map suggests.<\/p>\n Why these mines matter<\/p>\n Spain\u2019s new mines matter because they finally put real extraction landscapes beneath a chemical trail that once seemed too broad.<\/p>\n Further excavation could show how ore left Iberia, who controlled it, and how much of Scandinavia\u2019s bronze depended on that flow.<\/p>\n \u2014\u2013<\/p>\n Like what you read?\u00a0Subscribe to our newsletter<\/a>\u00a0for engaging articles, exclusive content, and the latest updates.<\/p>\n Check us out on\u00a0EarthSnap<\/a>, a free app brought to you by\u00a0Eric Ralls<\/a>\u00a0and Earth.com.<\/p>\n \u2014\u2013<\/p>\n","protected":false},"excerpt":{"rendered":"Researchers have identified six Bronze Age mines in southwestern Spain that match the long-suspected source of metal 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