APPENDIX B. ACCIDENT STATISTICS COVERING COAL MINES IN THE UNITED STATES FIGURE 1.-Fatality rates in bituminous-coal mines of the United States based on manhours of exposure (portal to portal). FIGURE 2.-Nonfatality rates in bituminous-coal mines of the United States based on manhours of exposure (portal to portal). FIGURE 3.-Fatality rates in anthracite mines of Pennsylvania based on man-hours of exposure (portal to portal). FIGURE 4.-Nonfatality rates in anthracite mines of Pennsylvania based on man-hours of exposure (portal to portal). FATALITIES 1920 1922 1924 1926 1928 1930 1932 1934 1936 1938 1940 1942 1944 1946 1948 FIGURE 5.-Fatalities in major gas or dust explosions in bituminous-coal and anthracite mines of the United States. Comparative fatalities and fatality rates per million tons of coal produced during the first 4 months of 1948 and 1949, respectively Number of fatal and nonfatal injuries in coal mines in the United States Fatalities and a comparison of fatality rates based on man-hours exposure in underground bituminous coal mines, by employment groups 1 These fatalities occurred in underground bituminous coal mines employing less than 25 men. NOTE.-These data cover only underground employees. They do not include surface employees nor strip-mine employees. The man-hours are based on working time, and not on portal-to-portal time. Number of men killed in major gas and dust explosions in coal mines of the United States |