| Characteristic |
Colliery A |
Colliery B |
| Use of respiratory protection equipment |
Slightly > national average |
Significantly < national average |
| Dust Levels |
Not excessive over last 10 years but some increase last 10-years |
Dusty |
| |
|
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| Places of Work |
|
Most of those affected had worked in geological faults & cutting through stone may have led to increased quartz exposure |
| Mining methods |
|
Recent introduction machinery to cut through rock previously removed by explosives requiring removal of miners when firing, & lower exposures. |
| Working hours |
Cases worked longer than non-cases & standard work week. Work week time doubled in extreme cases & 7 days/wk, 12 hr shifts common. Considered most significant factor leading to increased CWP incidence in collieries A & B. |
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