Image of 'polluted red river' caused shock but Nornickel stresses it is committed to cleaning up environment, and there will be no repeat.
Six infernos ravaging the region's nature have been extinguished in the past 24 hours, it is reported.
Shocking puce water as nearby nickel processing plant says cause is decades of contamination in Soviet times which company is working to overcome.
Officials deny any risk of atomic contamination from the site in Sakha Republic.
Leading oil producer Rosneft burns spilled oil to 'minimise ecological damage'.