Why are Salvadorians rejecting mining investments in their country?

Salvadorans are clear that they oppose mining because of these environmental and health concerns: so far they have voted overwhelmingly against it in three municipal consultations, and government authorities have been considering the first national ban on mining.
But a foreign mining company isn’t interested in what the people want. The company has engaged in public relations campaigns and lobbying to unsuccessfully try to pressure El Salvador to support mining. When the government did not grant them a mining permit, they decided to change tactics and use a lawsuit, despite failing to fulfill the legal requirements. Using a now-amended Salvadoran investment law, the company sued the government for $300 million – for lost potential profits – in a foreign tribunal, thousands of miles from El Salvador’s democratically-elected governments and court system.
http://politicsofpoverty.oxfamamerica.org/2015/04/why-are-salvadorians-rejecting-mining-investments-in-their-country/