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. Author manuscript; available in PMC: 2019 Apr 15.
Published in final edited form as: Int J Hyg Environ Health. 2017 Apr 13;220(5):857–868. doi: 10.1016/j.ijheh.2017.04.001

Table 2:

Fibre to dust ratios by unit

Unit Overall Year of sampling
1995 2007 2013/14
Median Fibre to Dust Ratio Range Median Fibre to Dust Ratio Range Median Fibre to Dust Ratio Range Median Fibre to Dust Ratio Range
Mining 1.09 (0.15–5.29) 1.37 (0.15–5.29) 0.85 (0.43–2.13)
Mine dump 0.69 (0.06–2.09) 0.53 (0.06–1.7) 1.28 (0.27–2.09)
Drilling 0.58 (0.49–1.88) 1.19 (0.49–1.88) 0.58 (0.49–0.66)
Rail transport 1.02 (0.32–6.9) 0.86 (0.32–2.29) 1.40 (0.45–6.9)
Crushing and sorting – main 0.56 (0.13–5.6) 3.08 (0.57–5.6) 0.54 (0.13–2.78) 0.68 (0.27–1.14)
Crushing and sorting - drying and boiler 0.71 (0.25–3) 1.53 (0.4–2.31) 0.75 (0.28–3) 0.59 (0.25–1.03)
Crushing and sorting - dust chamber/bag house filter 1.50 (1.11–1.79) 1.50 (1.11–1.79)
Enrichment – main 1.01 (0.22–3.78) 0.78 (0.6–1.39) 1.15 (0.33–3.78) 0.64 (0.22–3.48)
Enrichment - dust chamber/bag house filter 1.84 (1.08–3.25) 1.84 (1.08–3.25)
Enrichment - dust/waste bunker 0.56 (0.41–2.68) 0.50 (0.41–0.69) 1.63 (0.58–2.68)
Final Product (packaging) 1.09 (0.21–5.18) 1.57 (0.91–1.85) 1.16 (0.21–5.18) 0.68 (0.59–1.21)
Laboratory 1.19 (0.79–1.88) 1.19 (0.79–1.88)