By Alex MacDonald

LONDON--Rio Tinto PLC (RIO) Wednesday said there was no environmental impact from two separate incidents in which radioactive slurry spilled from its operations in Namibia and Australia.

Rio Tinto experienced a low-grade slurry spill at its uranium Ranger mine in Australia's Northern Territory, Rio Tinto's head of energy Harry Kenyon-Slaney told analysts at an investor day here. The Ranger mine is owned by Energy Resources of Australia, which is majority owned by of Rio Tinto. The leak occurred on Saturday, according to U.K. newspaper The Guardian.

Days earlier, a similar incident occurred at Rio Tinto's uranium Rossing mine in Namibia.

Mr. Kenyon-Slaney said that the spills had been contained and there was "no impact on environment."

He said it was "too early [to determine] what the implications of these incidents will be."

Rio Tinto's chief financial officer, Chris Lynch, who was also at the investor day, said that as of the end of November, the company has reached this year's operating costs savings target of $2 billion and remains on track to deliver $3 billion in cost savings by the end of 2014 compared with 2012. The company has also beat this year's exploration and evaluation cost savings target of $750 million by $50 million.

Rio Tinto said in a presentation it plans to progressively reduce its capital expenditure to less than $14 billion this year, $11 billion next year, and less than $8 billion in 2014 after spending $17.6 billion in capital expenditure in 2012.

-Write to Alex MacDonald at alex.macdonald@wsj.com

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