NONFATAL INJURIES PER MILLION MAN-HOURS EXPOSURE (PORTAL TO PORTAL)

30

90

107.37

98.73

Figure 2. Nonfatal injury rates in anthracite mines of Pennsylvania.

FATAL INJURIES PER MILLION MAN-HOURS EXPOSURE (PORTAL TO PORTAL)

6

.8

1.0

1.2

1.6

.2

1.31

*Subject to revision

Figure 4. - Nonfatal injury rates in bituminous-coal mines of the United States.

APPENDIX G

TABLE 1.-Average injuries per million man-hours exposure (portal to portal)

TABLE 2.-Major coal-mine disasters in the United States

APPENDIX H

Number of coal mines in the United States in which major improvements were made, fiscal year ended June 30, 1951

10002ONCOL

4

0

3000