Universiti Malaysia Sabah,(UMS) lecturer and geologist Prof Dr Felix Tongkul said the controlled filling of the 80m Mamut Copper Mine in Ranau district would take about 10 years and cost at least RM100mil.
He said the work would essentially involve filling up the pit with rocks and earth while the acidic mine drainage (AMD) is pumped out and treated before being discharged into the nearby Sungai Mamut.
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