EDITOR: For all of you diehard environmentalists, the following scientific proof about the pros and cons of dredging for gold through extensive research can be found at these Websites. All of the information that is stated is backed by government and environmental studies.
For your information, all of these studies were done with dredges in the river unlike the recent studies that Sierra Club and its associates tried to pass off as scientific studies (they did all of their testing with no actual dredging). So please read the findings that were not allowed to be used in the lawsuits that our friendly Sierra Club and associates are trying to push as accurate and scientifically performed. By the way, they have been issued grants (we paid for) to dredge for the mercury that we have been removing all along.
Find them here: westernminingalliance.org/wp-content/uploads/2012/05/Suction-Dredge-Facts-June-2012.pdf and waterboards.ca.gov/water_issues/programs/cwa401/docs/suctiondredge/comments/james_foley.pdf.