Sand and rock
To contain cyanide and other toxic waste produced at the mine
The dam walls are crumbling, and the waste is spilling over the top
"If that dam collapses, four million tons of poisonous sludge will gush down the mountainside and destroy our village completely. The gold mine isn't even productive anymore. Please remove the poisonous sludge and take that dangerous dam down for good. Our lives are at stake!"
-- Mayor of local village
"You can't take our dam down! Okay, so maybe the gold mine isn't as productive as it used to be. And maybe our dam wasn't built by a qualified engineer, but it won't collapse. I promise!"
-- President of gold-mining company