John Smart discovered the 1,000-year-old, finger-sized sliver of metal while exploring the island, which sits in the Irish Sea between Northern Ireland and England, according to a statement from Manx National Heritage.
"It's the thought of finding something of interest ... you're detecting over a land with nothing, it's soundless, then suddenly there's a little beep," Smart told the Isle of Man's Manx Radio. Sign up for the Live Science daily newsletter nowGet the world’s most fascinating discoveries delivered straight to your inbox.
Ingots were common currency for Vikings and served as a substitute for silver coins to pay for goods and services.
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