Eskom, which produces about 95% of South Africa’s power, has been forced to implement rolling blackouts that caused economic output to contract the most in a decade in the first quarter.

The miner, which spun out of BHP in 2015, has been trying to sell its South African thermal coal operations for more than a year.

The EPA's proposal would unwind some of the requirements set in 2015 for treating toxic wastewater and ash discharge.

The Ohio-based miner is the eighth coal company to go under over the past year as demand for the fossil fuel continues to diminish.