Contaminated wastewater is seen at the entrance to the Gold King Mine in San Juan County, Colo., in this picture released by the Environmental Protection Agency. The photo was taken Wednesday; the plume of contaminated water has continued to work its way downstream. Reuters /Landov hide caption

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Women and their children wait for medication and instructions on how to use it at the clinic in Dareta, Nigeria. Treating children with high levels of lead is a painstaking process that works only if their environment at home is free from lead. David Gilkey/NPR hide caption

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Women and their children wait for medication and instructions on how to use it at the clinic in Dareta, Nigeria. Treating children with high levels of lead is a painstaking process that works only if their environment at home is free from lead. David Gilkey/NPR hide caption

itoggle caption David Gilkey/NPR

Brandi and Kaylee plan to open a truck repair shop when they graduate from high school. Robert Smith/NPR hide caption

itoggle caption Robert Smith/NPR

Planet Money

Boom Town, U.S.A.

Rising gold prices mean Elko, Nev., is doing great. But people there know the good times won't last forever.

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Mine helmets and painted crosses sat at the entrance to Massey Energy's Upper Big Branch coal mine on April 5, as a memorial to the 29 miners killed there one year earlier. Jeff Gentner/AP hide caption

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