New York’s biggest coal mining company is facing multiple lawsuits over an outbreak of pneumoconia, which can cause serious brain damage.

The Mine Safety and Health Administration says a miner in Pennsylvania who tested positive for pneumoconitis was exposed to the deadly bacteria.

In a statement, the company said it was investigating a report from a miner who said he contracted pneumoconiasis while working at a mine in Pennsylvania.

The company says it will not settle any of the claims, but has hired an outside medical firm to conduct an independent analysis of the worker’s history and work habits.