When the eastern wall of a tailings storage facility at the Williamson diamond mine, in Tanzania, was breached on November 7 last year, precautionary measures to contain the tailings material and strengthen the New Alamasi water dam were carried out at the operation which is owned 75% by London-listed Petra Diamonds and 25% by the government of Tanzania. These risk-mitigation measures, which followed flooding extending into areas outside of the mine lease area, have now been completed, Petra stated in a release to Mining Weekly on Tuesday.
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