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Questions and Answers
What is the primary purpose of auger mining?
What is the primary purpose of auger mining?
- Creating drainage holes for acid-laden water
- Preventing surface subsidence and spontaneous combustion
- Recovering coal under the highwall after strip mining (correct)
- Exploring new coal seams beyond the highwall
What is the approximate coal recovery percentage achieved by auger mining?
What is the approximate coal recovery percentage achieved by auger mining?
- Three-quarters
- Half
- One-third (correct)
- Two-thirds
What is a significant disadvantage of auger mining mentioned in the text?
What is a significant disadvantage of auger mining mentioned in the text?
- It is expensive compared to other mining methods
- About 65% of the reserve (coal) remains in place (correct)
- It causes surface subsidence and spontaneous combustion
- It has a high success rate in coal recovery
What is the depth to which auger holes may be drilled, as mentioned in the text?
What is the depth to which auger holes may be drilled, as mentioned in the text?
What is the primary difference between highwall mining and auger mining?
What is the primary difference between highwall mining and auger mining?
What is the maximum distance the highwall miner can advance under the highwall?
What is the maximum distance the highwall miner can advance under the highwall?
What is the approximate coal recovery percentage for highwall mining?
What is the approximate coal recovery percentage for highwall mining?
Which machine is NOT used in the Continuous Mining System?
Which machine is NOT used in the Continuous Mining System?
When is In-Pit Crushing and Conveying (IPCC) used?
When is In-Pit Crushing and Conveying (IPCC) used?
What is the key factor for success with any IPCC system?
What is the key factor for success with any IPCC system?
What do Aqueous Methods in surface mining primarily employ?
What do Aqueous Methods in surface mining primarily employ?
What is the common element shared by highwall miner and continuous mining machine?
What is the common element shared by highwall miner and continuous mining machine?
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