Coal India is facing a potential financial impact of Rs 35,000 crore in a "worst-case" scenario due to a Supreme Court review on mining taxes. The company's subsidiaries Mahanadi Coalfields Ltd and Central Coalfields Ltd are the most affected, with uncertainty surrounding the recovery of taxes from customers. Coal India Chairman P M Prasad expects a net impact of Rs 6500-7000 crore, pending further clarity on the matter.