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Investigation: Samarco Dam Failed Due to Poor Drainage and Design

The deadly collapse of a tailings dam last November at the Samarco mine, owned by Vale SA and BHP Billiton, was caused by drainage and design flaws, a report into Brazil's worst-ever environmental disaster showed Monday. The 76-page report commissioned by the companies responsible for the spill, which killed 19 people, did not assign blame or highlight specific errors in corporate or regulatory practice. Norbert Morgenstern, a geotechnical engineering professor who headed the...

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