Table 6.
Major coal type |
County | Coal sub-type | Coal mine | N | Total Quartz (% of coal) |
Respirable Quartz* (% ofcoal) |
---|---|---|---|---|---|---|
Smoky | Xuanwei | Coking | 19 | 4.58^ | 1.93 ^ | |
11 | 6.77 | 3.1 | ||||
10 | 7.52 | 3.39 | ||||
Azhi | 2 | 4.11 | 2.33 | |||
Baoshan | 1 | 6.4 | 3.83 | |||
Laibin | 2 | 10.48 | 5.69 | |||
Tangtang | 4 | 7.52 | 3.39 | |||
Yangchang | 1 | 11.97 | 1.28 | |||
Fuyuan | Coking | 8 | 3.24 | 1.14 | ||
3 | 4.58 | 1.87 | ||||
Daping | 1 | 3.82 | 0.93 | |||
Enhong | 1 | 7.39 | 2.46 | |||
Haidan | 1 | 4.58 | 1.87 | |||
1/3 coking | 2 | 1.87 | 0.98 | |||
Bagong | 1 | 1.08 | 0.63 | |||
Dahe | 1 | 2.66 | 1.33 | |||
Gas fat | Housuo | 2 | 16.5 | 9.83 | ||
Meagre lean | Gumu | 1 | 2 | 0.96 | ||
Smokeless | 6 | 2.24 | 0.60 | |||
Fuyuan | LaoChang | 4 | 2.41 | 0.85 | ||
Xuanwei | RSXZ | 2 | 1.77 | 0.27 |
Italicized data indicate overall value for each county.
Statistically significant variation between smoky & smokeless coal types.
Respirable quartz represents quartz grains of size less than 9.6 μm.