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. Author manuscript; available in PMC: 2015 Jul 1.
Published in final edited form as: J Occup Environ Hyg. 2015;12(3):205–211. doi: 10.1080/15459624.2014.960577

Table II. TC/EC Ratios of Several Coal Mines in Australia.

Mine Engine controls Type Other control technologies used Whole data set EC > 50 μg/m3
N TC/EC Standard deviation N TC/EC Standard deviation
CA None Coal, LW Punch mine Diesel tag hoard, Electric mule at Recovery face 6 1.10 0.05 4 1.11 0.06
CB None Coal, LW mine Diesel tag board, Electric mule at Recovery face 10 1.46 0.18 7 1.36 0.07
CC None Coal, LW Punch mine Diesel tag board, Electric mule at Recovery face 7 1.27 0.10 4 1.21 0.02
CD None Coal, LW mine Diesel tag board, Electric Loader at Recovery face 16 1.27 0.08 10 1.26 0.07
CE Exhaust Filters Coal, LW mine Diesel tag board, Electric dozer at Recovery face, special vent circuit design for LW move 30 1.50 0.34 15 1.4 0.17
CF None Coal, LW mine Diesel tag board 12 1.23 0.05 12 1.23 0.05
CG None Coal, LW mine Diesel tag board 25 1.32 0.14 21 1.31 0.13
CH None Coal, LW mine Diesel tag board, Electric mule at Recovery face 9 1.24 0.15 9 1.24 0.15
CI None Coal, LW mine Electric mule at Installation face 5 1.32 0.07 4 1.33 0.08