CYANIDE LEACHING
In the 1890s, a new gold process helped turn Mercur, Utah, into a boomtown of over 2,500; by 1913, the mine had closed, and the original townsite was abandoned, though mining later resumed
A trillion-ton threat hangs over critical minerals
Trapped in a gold dustbowl: Residents of Kolar Gold Fields hope revival of mining will lead to better days
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