French Guiana is experiencing a genuine gold rush: the number of illegal gold-mining sites is estimated at between 500 and 900. According to France's National Forestry Office, over 1,300 kilometers of rivers and 12,000 hectares of forest are directly affected by this activity. It is well known that gold mining has a negative impact on the environment due to the release of mercury into rivers. However, the ecological impact of increased water turbidity caused by gold mining is little known.
http://www.physorg.com/news/2012-02-small-scale-gold-impacts-river-algae.html
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