Recent studies have raised concerns that the number of cases is increasing to the highest levels recorded in 25 years, according to the Centers for Disease Control, especially in miners who worked in West Virginia, Kentucky, Pennsylvania or Virginia.

\"PHOTO:A
Bloomberg via Getty Images, FILE
PHOTO:A coal miner works in a longwall mining tunnel at the Consol Energy Bailey Mine in Wind Ridge, Pa., May 14, 2013.
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Coal miners are at high risk for developing lung diseases, which can complicate breathing and lead to premature death. The most common form is called black lung disease because the inhaled coal dust and related scarring often appears dark on x-rays.

Coal miners diagnosed with black lung are eligible for federal benefits from the Black Lung Trust Fund, which helps with medical care and expenses if they're no longer able to work.

But the tax on coal companies decreased earlier this year, and Congress didn't renew it. That decline in revenue combined with declining coal production means the trust fund won't be able to cover the costs for 25,600 miners currently enrolled -- or any newly diagnosed with the condition, according to testimony from the Government Accountability Office.

\"PHOTO:
Dylan Lovan/AP, FILE
PHOTO: Dr. Brandon Crum points to the X-ray of a black lung patient at his office in Pikeville, Ky., Jan. 24, 2019.
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GAO reported the trust fund borrowed $1.3 billion in taxpayer funds in fiscal year 2017, when funding from coal companies ran short, and that if nothing changed it could need more than $15 billion in federal funds by 2050. The office is still conducting work to issue recommendations on how to support the fund.

An additional concern is that miners are exposed to high levels of silica, which can make up a big portion of rocks like quartz that are dug through to reach coal deposits, and which aren't regulated as much as coal dust.

President Donald Trump's administration has taken multiple steps to help the coal industry and bring back jobs they say were under attack under President Barack Obama. But when it comes to coal miners dealing with occupational illness, there's increasing concern that the fund that pays for their medical treatment mines is in trouble, in part because the administration and Congress allowed a tax on coal companies to expire.

\"PHOTO:
Mark Lyons/Getty Images FILE
PHOTO: Republican Presidential candidate Donald Trump models a hard hat in support of the miners during his rally at the Charleston Civic Center on Charleston, W.V.a, May 5, 2016.
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A joint investigation from NPR and PBS' Frontline last year reported that regulators weren't preventing cases where miners were exposed to excessive levels of silica.

Rep. Mark Takano, D-Calif., said he could hardly contain his anger at the issue in the hearing.

\"Miners would not be dying at these drastic levels if there was effective regulation and strong federal enforcement,\" he said.

The head of the Mining Safety and Health Administration, which oversees working conditions in mines, told members of Congress the agency has stepped up enforcement and monitoring in mines and is taking steps to set a limit on how much silica miners can be exposed to. Some lawmakers and witnesses at the hearing suggested the evidence about the connection between silica and lung disease was enough for the agency to set an emergency limit, but Assistant Secretary David Zatezalo said he's required to follow a more lengthy administrative procedure.

\"PHOTO:
Dylan Lovan/AP, FILE
PHOTO: A retired coal miner displays his mining helmet at his home in Coeburn, Va., Jan. 24, 2019.
>

Zatezalo said the majority of mines are still within the silica limits recommended by the Occupational Safety and Health Administration, even though MSHA's limit is technically twice as high, and that new rules have helped decrease exposure to dust even more.

The NPR/Frontline investigation found that about 15% of samples from mines over a 30 year period contained excessive levels of silica.

\"Given that the average exposure is already half what OSHA's limit is, it would seem to me that an emergency standard would be uncalled for,\" he said Thursday.

Cecil Roberts, international president of the largest mine workers union, said Thursday he has testified on this issue multiple times over the years. He called on Congress to set stricter limits for how much silica miners can be exposed to and to take a bigger role in oversight of mine operators.

\"We can all come here today and act like we need some more time, but coal miners don't have any time. They're dying in West Virginia, they're dying in Kentucky and they're dying in Virginia, and they don't have any more time to wait here,\" he told the House Education and Labor Committee in a hearing on Thursday.

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