River Gold (image) Duke University Share Print E-Mail Caption A small-scale gold mining operation docks along the Madre de Dios River in Peru. Small boats remove sediment from nearby riverbank where mercury is added to extract gold. Recently, the Peruvian Navy has begun to crackdown on mining operations directly on the river by bombing small boats such as this one. Credit Sarah Diringer, Duke University Usage Restrictions None Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.