Metals in Bronze Age Weapons Discovered in Sweden Came from Distant Lands
Researchers analyzing bronze daggers, swords, and axes found in bogs and graves at various places in Sweden over the years have made a surprising find. Some of the artifacts date as far back 3,600 years ago, and they say the objects were made with copper from southern Europe, Turkey, and Cyprus.
The researchers determined the place of the origin of the copper and tin in the tools by analyzing isotopes and comparing it to metals from places in Europe where there were mines in prehistoric times.
Photo of two massive shaft-hole axes that match Cypriote ores - a shaft-hole axe of Valsømagle type, dated to 1600-1500 BC and a shaft-hole axe of Fårdup type, dated to 1600-1500 BC. The former axe was discovered in a bog together with horse bones and a stone paving with post holes. (Photo by L Granding)
Copper, which is a pure element, when mixed with tin or other metals becomes an alloy called bronze. The mixing of the two metals makes bronze stronger than copper alone. This development revolutionized tool- and weapon-making.
Some peoples around the world fashioned copper into tools and weapons before the Bronze Age, but those implements were not as strong.
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The production of bronze allowed for more intensive farming, a population increase, and, unfortunately, more widespread and devastating warfare. The Bronze Age lasted from the 3rd to 1st millennium BC in Eurasia.
Early Bronze Age ('Beaker') metal-worker about 2000 BC; by Paul Jenkins, about 1980. ( National Museum Wales )
Researchers also believe that rock carvings near where a few of the copper tools were found, in Bohuslän, Sweden, depict ships that were trading from the Mediterranean region.
The distance from Cyprus to Sweden is about 3,000 kilometers or 1,865 miles as the crow flies. The actual route would have taken traders across the Mediterranean Sea and up the Atlantic coast of Europe or the reverse route from Sweden. Or, traders could have carried it overland, through thick forests and sparsely populated areas.
Rock carving with the shape of a flock of birds and other features at Tanun, near Tanumshede, Bohuslän, Sweden. ( Legumvra/ CC BY 2.5 )
No matter how the copper from which the knives and axes got to Sweden, the journey was sure to have been an adventure for the traders and crew.
Dr. Johan Ling of Sweden’s Gothenburg University and his team did isotope analysis on 70-some bronze daggers, swords and axes and proved that some came from Cypriot copper mines. Cyprus is at the far eastern end of the Mediterranean, off the coasts of Syria and Turkey.
Lead isotope ratios of five bronzes from Sweden compared with the copper ores from Cyprus and Bronze Age Cypriot copper based artefacts. Not all Bronze Age metals found on Cyprus are made of Cypriot copper: some of them are made of metal from the Taurus Mountains in south Turkey, and some of copper brought from the Western Mediterranean (After Ling et al 2014).
The copper may have been traded for amber—another key element of Bronze Age trade.
“Some of the axes and not least the swords were made for combat,” Dr. Ling told Ancient Origins via e-mail. “There exists some concrete evidence of wounded skeletons. Some of the artefacts are from graves with other items and features. Most of the artefacts derive from hoards from a wet environment or from graves.”
Most of the artifacts that dated to 2000 to 1500 BC were made with copper ore mined in North Tyrol and apparently traded north to Sweden. Many of the artifacts during the period of 1500 to 1100 BC were from copper mined in the Italian Alps. During the period of 1100 to700 BC, the ores came from southern Iberia and North Tyrol. Some tin came from Cornwall, England, and from southern Germany, Dr. Ling said in the email. “Well, it should be stressed that the Cypriote copper was rather limited,” he wrote.
Mining archaeological research gap in the western part of North Tyrol (top left) and mapping of surveyed and sampled copper mineralizations during a 2013 study of Copper mineralizations in western north Tyrol in prehistoric times. ( Grutsch, Martinek & Krismer )
There is no evidence for copper indigenous to Bronze Age Scandinavia, he added.
Professor Kristian Kristiansen, Dr. Ling’s colleague at the university’s department of archaeology, told In.Cyprus.com that “Bronze was as valuable a raw material as oil is today.”