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100 years ago, yesterday, was the worst hard rock mining disaster in the US, in Butte, Montana. They didn't have this way of warning the miners back then and 168 miners died due to a fire in one of the shafts. Most died from asphyxia.

Michael Punke, the author of the Revenant, wrote an excellent non-fiction book about it called "Fire and Brimstone: The North Butte Mining Disaster of 1917".