The African miner, fined over the incident in January, said the spillage happened after sections of a pipeline used to carry waste water from North Mara mine to a tailings storage facility (TSF) had been either been vandalized or stolen. As a result, it said, the pump used to move tailings was switched off causing water levels in the pond to rise and subsequently overflow.
“The mine has welcomed the support of the government on resolving this issue, and is working closely with the authorities to implement improvements to security measures around the polishing pond in order to help prevent any recurrence,” Acacia said in the statement.
Barrick Gold, which owns 63.9% of Acacia Mining, recently proposed at a plan to settle disputes between the Tanzania miner and the country's government, which includes a $300 million payment to resolve tax claims in the East African nation.
In 2017 Acacia was handed a $190 billion tax bill — almost four times Tanzania’s gross domestic product and about two centuries worth of revenue for the company — for underreporting output, an allegation it denies.
North Mara is Acacia’s largest mine. It churned out 336,055 ounces of gold last year or about 65% of the company’s total output.