People's anger has very little to do with the amount of scientifically measured environmental damage. It has everything to do with what they believe is important and sacred. If you were invited for dinner by friends and put your boots on the white dining room table cloth you would be kicked out of the house, even if you could prove scientifically with a 500 page report that the boots would cause no harm to the tablecloth. For some people, a gold mine in a rain forest is the same as boots on the table. Any sign that the mine is capable of environmental indiscretions is a violation of a sacred trust.
Outrage is the result.
No facts will allay that outrage. The managers at the Omai Gold Mine made many changes to environmental and tailings management practices after the spill. A new tailings dam was built to the highest known standards. The mine is now actively developing its environmental management system for ISO 14001 certification. But they are keenly aware that the public will not tolerate any other indiscretions.