Well, according to the article, the people don't want a bigger piece of thee cake, they want to be moved away from the mine. And it seems there IS some evidence of problems: "Leoncia Ramos, a spokesperson for the committee, sits down at a table to explain what has changed over the past 12 years: “There are many people who suffer respiratory problems, vision loss, skin lesions, heart problems and depression because of the situation. People are dying.” The people are also concerned about a new dam being built.
I don't know. I am just quoting the article.