Unit | Dust | Mine 1 | Mine 2 | Mine 3 | Mine 4 | Mine 5 | Mine 6 |
---|---|---|---|---|---|---|---|
Extraction | respirable | 7.2±2.1 | 6.9±2.3 | 7.2±1.9 | 6.5±1.9 | 8.7±1.8 | 7.5±1.7 |
Silica content | 1.08±0.11 | 1.104±0.13 | 0.98±0.08 | 1.18±0.14 | 0.957±0.21 | 1.12±0.19 | |
Crushing | respirable | 10.4±2.1 | 11.3±2.7 | 10.9±1.8 | 12.3±2.1 | 10.8±1.8 | 11.7±1.9 |
Silica content | 1.45±0.17 | 1.808±0.33 | 1.85±0.23 | 2.09±0.41 | 1.404±0.18 | 1.87±0.32 | |
Wet processing | respirable | 3.2±0.98 | 2.9±0.87 | 4.2±1.3 | -* | - | - |
Silica content | 0.544±0.08 | 0.561±0.09 | 0.756±0.12 | - | - | - | |
Dry processing | respirable | 7.3±2.1 | 6.9±1.8 | 7.2±1.9 | 6.5±1.8 | 7.4±1.9 | 8.3±2.9 |
Silica content | 1.38±0.41 | 1.24±0.39 | 1.51±0.24 | 1.105±0.29 | 1.702±0.31 | 1.99±0.42 | |
Loading | respirable | 7.1±2.1 | 6.9±1.9 | 7.2±2.1 | 8.6±1.8 | 8.8±1.9 | 8.9±2.3 |
Silica content | 1.49±0.19 | 1.58±0.31 | 1.36±0.29 | 1.23±0.41 | 1.71±0.27 | 2.044±0.41 | |
Management/ administration |
respirable | 1.7±0.7 | 1.9±0.07 | 2.1±0.26 | 1.8±0.15 | 1.4±0.18 | 2.1±0.17 |
Silica content | 0.205±0.08 | 0.323±0.09 | 0.378±0.08 | 0.28±0.13 | 0.261±0.09 | 0.215±0.11 |