(Bloomberg) -- MMC Norilsk Nickel PJSC said it disagreed with a Russian watchdog’s 148 billion-ruble ($2.1 billion) estimate of the damage caused by a fuel spill from one of its storage tanks in the Arctic.

The Federal Service for Supervision of Natural Resources used the highest damage coefficient, which assumes the company did nothing to mitigate the damage from the spill, Nornickel said in a statement on Wednesday. That isn’t true, said the miner, which called in a specialist clean-up team from Murmansk after the accident.

On Monday, Russia’s ecological watchdog estimated the damage from the massive spill at the end of May and asked Nornickel to pay for it. The company has pledged to fully fund the clean-up, but estimated the cost to reach $150 million, excluding any fines.

It already spent more than 5 billion rubles in June. More than 33,000 tons of water and fuel mixture has been collected in the area, and more than 172,000 tons of contaminated soil removed as of July 2, according to Nornickel.

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