Company A | Company B | ||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Department/ job task | Total dust | Tremolite asbestos | Department/ job task | Total dust | Tremolite asbestos | ||||||||||
n | GM (mg/m3)4-150 | Range (mg/m3) | n | Maximum (fibres/ml)4-151 | n | GM (mg/m3)4-150 | Range (mg/m3) | n | Maximum (fibres/ml) | ||||||
Underground mine: | Open cast mine: | ||||||||||||||
Drilling | 6 | 2.9 | 1.0–59 | 2 | <0.03 | Drilling | 11 | 12.5 | 0.2–78 | 1 | <0.03 | ||||
Charging | 9 | 10.9 | 3.4–68 | — | Loading | 3 | 0.6 | 0.3–2.1 | 1 | <0.03 | |||||
Loading | 4 | 2.5 | 1.1–3.5 | 1 | 0.06 | Lorry driving | 2 | 0.2 | 0.1–0.3 | 1 | <0.03 | ||||
Mixed | 6.04-153 | — | |||||||||||||
Mill: | Mill: | ||||||||||||||
Manual sorting | 18 | 20.4 | 2.8–56 | 2 | 0.10 | Manual sorting | 6 | 11.8 | 1.9–55 | 2 | 0.04 | ||||
Crushing | 12 | 21.4 | 2.2–83 | 1 | <0.03 | Crushing | 6 | 5.9 | 2.9–10 | 1 | <0.03 | ||||
Bagging | 32 | 20.7 | 2.5–136 | 4 | 0.12 | Bagging | 9 | 21.7 | 5.0–55 | 3 | 0.14 | ||||
Truck driving | 2 | 1.0 | 0.7–1.5 | 1 | <0.03 | Truck driving | 3 | 3.9 | 3.1–4.9 | 1 | 0.05 | ||||
Service | 9.24-152 | — | Service | 6.04-152 | — | ||||||||||
Mixed | 18.34-153 | — | Mixed | 10.14-153 | — | ||||||||||
Other | 1.04-152 | — | Other | 2 | 1.1 | 0.9–1.4 | 1 | <0.03 | |||||||
Lime works: | Lime works: | ||||||||||||||
Mixing | 42 | 9.6 | 0.5–36 | 3 | <0.03 | Mixing | 14 | 8.0 | 1.7–17 | 3 | 0.03 | ||||
Bagging | 21 | 13.2 | 2.9–72 | 2 | 0.03 | Truck driving | 2 | 2.3 | 1.2–4.6 | 1 | <0.03 | ||||
Truck driving | 2 | 0.4 | 0.4–0.5 | 1 | <0.03 | Mixed | 5.74-153 | — | |||||||
Mixed | 7.94-153 | — | Other | 1.14-152 | — | ||||||||||
Other | 0.44-152 | — | |||||||||||||
Putty works: | Putty works: | ||||||||||||||
Mixing | 14 | 6.0 | 2.4–16 | 5 | 0.03 | Mixing | 8 | 3.6 | 1.2–11 | 4 | 0.03 | ||||
Truck driving | 2 | 1.3 | 0.9–1.8 | 1 | <0.03 | Truck driving | 2 | 0.9 | 0.7–1.2 | 1 | <0.03 | ||||
Mixed | 4.64-153 | — | Mixed | 2.74-153 | — | ||||||||||
Other | 1.34-152 | — | Other | 1.14-152 | — | ||||||||||
Total | 158 | 23 | Total | 68 | 20 |