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Stunning hoard of Bronze Age jewelry discovered by local hiker in Sweden

The hoard's contents included this large hook with spirals, as well as this neck ring.
A newly discovered hoard, which includes this large spiraled hook and neck ring, dates to Sweden's Bronze Age. (Image credit: Mats Hellgren/Lödöse museum)

A Bronze Age hoard brimming with fine jewelry was discovered in Sweden in early April, when a local man investigated what he thought was a piece of scrap metal sticking out from under a pile of rocks in a hilly, wooded area. 

Tomas Karlsson was doing an outdoor navigation activity called orienteering when he uncovered the stash, located just outside of the municipality of Alingsås in southern Sweden. He quickly realized that the metal wasn't scrap — it was ancient bronze jewelry that had since turned green. It appeared that a wild animal had recently dug up a few pieces, revealing the metal, so Karlsson contacted the local authorities, who told archaeologists about the site, according to Sveriges Radio, Sweden's national publicly funded radio station.

"It's one of the largest hoards we've ever excavated from the late Bronze Age in Sweden," project leader Johan Ling, a professor of archeology at the University of Gothenburg in Sweden, told Live Science. "And, indeed, [they're] also very spectacular bronzes and very well-preserved bronzes."

Related: Photos: A Bronze Age burial with headless toads 

The entire hoard has about 50 artifacts, and roughly 80% of the items appear to be associated with a high-status woman (or women) from the late Bronze Age, about 2,700 to 2,500 years ago, judging from the style of the objects, Ling said. The team is currently performing radiocarbon dating on charcoal pieces from the sediment where the hoard was found, he added.

The many treasures that were discovered include neck rings, bronze spirals, necklaces, arm rings, pins and ankle rings, as well as the head of an ax. "The interesting thing is [the hoard objects] are not very common in Scandinavia, although they are common in northern Poland and northern Germany," which indicates the existence of a "strong trade network," Ling said. 

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A neck ring and spiral from the hoard, just before they were excavated from the ground.

A bronze neck ring and spiral from the hoard, just before they were excavated from the ground. (Image credit: Mats Hellgren/Lödöse museum)
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A chunky foot ring from the Bronze Age hoard.

A chunky foot ring from the Bronze Age hoard. (Image credit: Mats Hellgren/Lödöse museum)
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The hoard included a bronze ax head.

The hoard included a bronze ax head. (Image credit: Mats Hellgren/Lödöse museum)

This hoard isn't part of a human burial, however. Instead, it's a collection of high-status objects that were purposefully buried, Ling said. It's possible that during the Bronze Age, people in this region performed ceremonies that were similar to potlatch, a custom practiced by Indigenous groups such as the Haida and Tlingit in the Pacific Northwest of the U.S. and Canada, Ling said. Although potlatch customs vary across the Pacific Northwest, they generally involve a lavish ceremonial feast, often with dancing and singing, during which people give away or destroy parts of their wealth to show their superior generosity and enhance their social standing, according to The Canadian Encyclopedia.

This buried Bronze Age hoard is likely "a self-investment, it's a manifestation of power that these elites are doing, showing that 'We can afford [this], we have this ability, you do not have this,'" Ling said. "[They] believed it showed their power by offering their surplus, so to speak."

It's also possible that the hoard was buried in parallel with an individual at another location, but archaeologists have yet to find a grave, he said. In this scenario, the hoard might have been buried as a type of potlatch, as well as a way to help the deceased in the afterlife, he said. 

It's unlikely the hoard was buried for safekeeping or to hide it from enemies, Ling noted.

A local man found the hoard under this boulder.

A local man found the hoard under this boulder. (Image credit: Mats Hellgren/Lödöse museum)

During the Bronze Age, people in what is now Sweden were farmers and agropastoralists, meaning they had a mix of farming and livestock. Surpluses were often invested in trade, as it was also a known maritime society, "because we do import all metals in Scandinavia at that phase, both copper and tin, and the bronzes are made of 90% copper and 10% tin," Ling said. The copper, for instance, came from the British Isles, the Iberian Peninsula and Central Europe, he noted.

Ling and his colleagues plan to further analyze the hoard. Its peculiar location might be a clue that there are hoards buried in similar spots, he said.

"It was found in a very sloppy, hilly area. I can tell you I would have passed that find and that assemblage of stones a thousand times [without looking there]," Ling said. "But now, we have a new pattern that we have to follow. There could be much more of these that we haven't been able to detect yet."

Originally published on Live Science.

Laura Geggel

As an editor for Live Science, Laura Geggel edits and writes pieces on general science, including the environment, archaeology and amazing animals. She has written for The New York Times, Scholastic, Popular Science and Spectrum, a site covering autism research. Laura grew up in Seattle and studied English literature and psychology at Washington University in St. Louis before completing her graduate degree in science writing at NYU. When not writing, you'll find Laura playing Ultimate Frisbee.