Even though the California Gold Rush took place more than a century ago, it left a toxic legacy of mercury pollution.
via Discovery News http://news.discovery.com/earth/rocks-fossils/gold-rush-s-poisonous-legacy-mercury-131030.htm#mkcpgn=rssnws1
via Discovery News http://news.discovery.com/earth/rocks-fossils/gold-rush-s-poisonous-legacy-mercury-131030.htm#mkcpgn=rssnws1
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