Super article on erosion in California gold fields.
http://sanfrancisco.cbslocal.com/2017/02/27/storm-runoff-in-california-gold-country-exposing-new-motherlode/
http://sanfrancisco.cbslocal.com/2017/02/27/storm-runoff-in-california-gold-country-exposing-new-motherlode/
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