24. March 2026

How Pirate Gold Turns Out to Be Cultural Heritage How Pirate Gold Turns Out to Be Cultural Heritage

+++RESEARCH TICKER UNIVERSITY OF BONN: Using Electron Beams to Combat Colonial Prejudices+++

During the colonial era, vast quantities of gold from the Akan people of present-day Ghana ended up in European smelting furnaces. Historical sources suggest that African traders may have systematically diluted the gold. State-of-the-art technology and a sunken pirate ship have now made it possible to verify this claim. 

All samples analyzed in the study at a glance:
All samples analyzed in the study at a glance: - They come from the “Whydah Gally,” a former slave ship that sank off the coast of Massachusetts in a storm in 1717. © Photos: Tobias Skowronek
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WHAT IS IT ABOUT?
For centuries, travel accounts by European sailors were the only source for reconstructing trade along the West African coast. The problem: These accounts are rarely neutral, as they are written from the perspective of European traders. They often describe African traders as deceitful and claim that the gold offered for trade was systematically adulterated. A new study is now debunking these colonial narratives with the help of state-of-the-art technology and a spectacular site—a sunken pirate ship.

HOW DID THEY GO ABOUT IT?
In collaboration with the German Mining Museum and U.S. scientists, a team led by geochemist Dr. Tobias Skowronek of the University of Bonn examined gold artifacts from the Akan people of present-day Ghana for the first time in a study published in the Nature Partner Journal *Heritage Science*. The Akan are a large ethnic group in West Africa. Such finds are extremely rare: European traders did not appreciate the craftsmanship of the pieces, but saw them only as raw material that they melted down immediately. As a result, a vast amount of cultural heritage ended up in European smelting furnaces.

WHAT EXACTLY ARE THESE FINDS?
The researchers took an unusual approach and examined the gold finds from the famous “Whydah Galley.” The former slave ship, which the notorious pirate Samuel “Black Sam” Bellamy had made his flagship, sank off the coast of Massachusetts in a storm in 1717. Since the pirates had previously raided at least 50 ships and amassed the loot on the Whydah, the wreck serves as a massive, perfectly dated collection of gold coins, nuggets, and jewelry—including Akan gold—which was then examined in greater detail.

WHAT IS THE MOST IMPORTANT FINDING?
In the research laboratory of the German Mining Museum, the samples were analyzed for their chemical composition using state-of-the-art X-ray technology. The results clearly contradict the written sources: The Akan gold shows no signs of systematic adulteration. On the contrary: Some samples consist of nearly 100% pure gold.

HOW DO YOU INTERPRET THE RESULTS?
While some pieces contain up to 25% silver, this is precisely the crux of the matter: European traders were unaware that the Ashanti Gold Belt in Ghana was the likely source. The gold there has a naturally fluctuating silver content. Because up to a quarter of the metal was sometimes actually silver, the Europeans suspected fraud and blamed the African traders. This myth of “fake gold” was repeated unchecked for centuries and became increasingly embellished. The study impressively demonstrates how scientific analytical methods help debunk centuries-old colonial prejudices and reevaluate the history of West African trade. 

Southern Ghana with the Ashanti Gold Belt:
Southern Ghana with the Ashanti Gold Belt: - 1 = Konongo, 2 = Obuasi, 3 = Mampon, 4 = Bogosu, 5 = Prestea. The most important British forts of the early 18th century, which the “Whydah Gally” may have called at, are marked in red. Elmina, the Dutch headquarters in West Africa, is marked in blue. © Illustration: Tobias Skowronek

Tobias B. Skowronek, Brandon Clifford & Christopher R. DeCorse: Pirate gold provides new insights into West African trade using pXRF and SEM EDS analysis, npj heritage science, DOI: https://doi.org/10.1038/s40494-026-02441-7 

Dr. Tobias Skowronek
Global Heritage Lab
Transdisciplinary Research Area “Present Pasts”
University of Bonn
Web: https://globalheritagelab.org/person/tobias-skowronek/ 
Georg Agricola University of Technology Bochum
Tel. +49 234 968-4053
Email: Tobias.Skowronek@thga.de 

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