Page 26 - Advances In Productive, Safe, and Responsible Coal Mining

data: 1940–70 of Percentage Productivity production US incidence mining surface (tons/miner/year) tons) (million IR equiv ) 9.2 962 513 23.9 1164 562 29.5 2294 435 43.8 4221 610

productivity fatal Equivalent (Fatal 0.260 0.133 0.171 0.180

and of rate

safety Number fatalities 643 325 260

of 1388
Summary of Number miners 533,267 483,239 189,679 144,480

2.1
Table Year 1940 1950 1960 1970