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Scientists Traced Arctic Arsenic Back to a Montana Mine

The Brief · written from 4 sources

Ice cores from Greenland, northern Canada and the Russian Arctic record arsenic, lead and other heavy metals linked to early 20th-century copper production.
Emissions from the Anaconda Copper Mine complex near Butte, Montana, about a century ago were carried by winds over the Arctic and deposited by storms.
The study is published in Nature Sustainability on 10 November 2026.

Why it matters

The findings tie a historic industrial source to widespread heavy-metal deposition far from its origin, and the Nature Sustainability paper links it to health burdens, which matters for how past pollution is assessed in environmental and health research.

Who’s affected

environmental scientists and climate researchers
public health researchers studying heavy-metal exposure
historians of mining and industrial pollution

#arsenic
#ice cores
#air pollution
#copper smelting
#heavy metals
#arctic

Joe McConnell has been studying ice cores from Greenland, northern Canada, and the Russian Arctic for decades. These cores contain stories about the history of Earth’s climate, including how humans have affected it. Derek Pickell admires a backlit snow pit showing the layers of…

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