Black lung disease, long a killer of coal miners, is on the rise again after retreating in the 30 years since Congress passed tougher mine safety laws, health and safety experts said on Friday.
The renewed appearance of the disease emerged from an investigation of the worst U.S. coal mining disaster in four decades. It comes at a time when coal prices have risen sharply and some mine operators have been accused of cutting corners on safety in favor of profits.
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