Vernan Bailey who has Black Lung disease is wheeled by his wife through the local supermarket, he can't be without his oxygen tank. There are currently about 42,000 underground coal miners actively working in the United States. The mining and production of coal is a major part of the economy in several developed countries. In the past 10 years, over 10000 American miners have died from CWP. Although this disease is preventable, many miners are still developing advanced and severe cases.