coal companies in the us

Mar 19, 2019 In 2017, it produced more than 70 million tonnes of coal – the second-highest amount in the US, according to the EIA. Opened in 1977, Black Thunder spans 35,700 acres and is estimated to contain 1.4 billion tonnes of recoverable coal reserves. It is operated by Thunder Basin Coal Company and produces low-sulphur, sub-bituminous coal.