A Tidal Wave of Mud - The New York Times
The deluge of toxic mud stretched for five miles, crushing homes, offices and people — a tragedy, but hardly a surprise, experts say.
This article is by Shasta Darlington, James Glanz, Manuela Andreoni, Matthew Bloch, Sergio Peçanha, Anjali Singhvi and Troy Griggs.
There are 88 mining dams in Brazil built like the one that failed — enormous reservoirs of mining waste held back by little more than walls of sand and silt. And all but four of the dams have been rated by the government as equally vulnerable, or worse.
Even more alarming, at least 28 sit directly uphill from cities or towns, with more than 100,000 people living in especially risky areas if the dams failed, an estimate by The New York Times found.