Rock Dusting
From ETHW
While investigations into the flammability of coal dust began in Europe in the late 19th century, research on the use of rock dusting to reduce explosion risk did not begin in the United States until the early 20th century. Rock dusting tests conducted at the Bruceton Experimental Mine in 1922 confirmed that rock dust, most often pulverized limestone, could prevent coal dust explosions. Mandated levels of rock dust would not be instituted until The Federal Coal Mine Safety Act of 1952.
