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

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

107.37

98.73

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

2.0

1.8

4

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

9

.8

1.0

1.2

1.6

.2

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