Liquefaction is a process whereby a solid material such as sand loses strength and behaves more like a liquid. A report has said mining company Vale knew a dam was at risk before it collapsed and killed 165 people. The firm claimed it had been ruled safe. An internal report has said Vale knew Dam 1 dam did not meet safety guidelines in 2018 and had a more than 100 -in-5,000 chance of collapsing, but Reuters said the report was misleading. The 2018 report had also forecast a collapse could cause more than 100 deaths and cost the company $ 1.5bn . It added that 165 other dams owned by Vale were at risk. Vale said the cause was still unknown.
A report has said mining company Vale knew a dam was at risk before it collapsed and killed 165 people. The firm claimed it had been ruled safe. An internal report has said Vale knew Dam 1 dam did not meet safety guidelines in 2018 and had a more than 100 -in-5,000 chance of collapsing, but Reuters said the report was misleading. The 2018 report had also forecast a collapse could cause more than 100 deaths and cost the company $ 1.5bn . It added that 165 other dams owned by Vale were at risk. Vale said the cause was still unknown.