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MINN1001
Underground Coal Mining Methods: Pillar Extraction
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Continuous Miner Pillar Extraction
Medium depth reserve
Higher production rate
Medium capital requirement
Higher reserve utilisation 70%
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Pillar Extraction
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GOAF
GOAF
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Minedout
Mined out
Fender
Snook
Pillar
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Snook
Policemen Sticks
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Pillar Extraction
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Pillar Extraction
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Pillar Extraction
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Pillar Extraction
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Pillar Extraction
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Pillar Extraction
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Pillar Extraction
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Pillar Extraction
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Pillar Extraction
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Pillar Extraction
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Pillar Extraction
Goaf
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Pillar Extraction
Ventilation: Splitting Through Goaf
Bleed Methane Out of Goaf
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Pillar Extraction
Ventilation: Coursing Past Face
Let Methane Build Up > 15% in Goaf
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Small Goaf
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Big Goaf
Breaker Line
Sticks
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Golden Rules for Pillar Extraction
1. Always mine toward the nearest solid
2. Never leave a half finished pillar
3. Leave a bigger snook on the intersection4. Avoid as far as possible stooping between goafs
5. Never change direction or sequence
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CM Partial Pillar Extracation
Medium depth reserve
Higher production rate
Medium capital requirement
Higher reserve utilisation 70%
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Partial Pillar Extraction
Checker Board Stooping
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Partial Pillar Extraction
Checker Board Stooping
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Partial Pillar Extraction
Checker Board Stooping
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Partial Pillar Extraction
Checker Board Stooping
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Partial Pillar Extraction
Checker Board Stooping
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Partial Pillar Extraction
Checker Board Stooping
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Partial Pillar Extraction
Checker Board Stooping
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Partial Pillar Extraction
Checker Board Stooping
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Partial Pillar Extraction
Checker Board Stooping
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Advantages of Checker Board Stooping
1. Utilisation +/- the same as stooping
2. No or little subsidence
3. Less disruption to ground water
4. No sudden goaf collapse
5. Easier to ventilate
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Partial Pillar Extraction
Pillar Splitting
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Advantages of Pillar Splitting
1. Utilisation +/- the same as stooping
2. No or little subsidence if fenders do not fail
3. Less disruption to ground water
4. No sudden goaf collapse
5. Easier to ventilate
6. Very high rate of production
But be warned: Pillar fenders may fail violently!!!!!!!!!!!