On Sept. 3, 1973, a fire swept through the baghouse of the Bunker Hill mine in Idaho’s Silver Valley. The building was designed to filter pollutants produced by smelting, the melting of rocks that separates metal from its ore. The gases produced in this process carried poisons, including lead.
Click here for original story, Idaho’s Silver Valley is still at risk 50 years after mine fire caused largest lead-poisoning case in US history
Source: Phys.org