Surface Mining Mechanical Extraction Methods Quiz
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Questions and Answers

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?

  • Three-quarters
  • Half
  • One-third (correct)
  • Two-thirds

    • 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?

    <p>More than 90 m</p> Signup and view all the answers

    What is the primary difference between highwall mining and auger mining?

    <p>The equipment used</p> Signup and view all the answers

    What is the maximum distance the highwall miner can advance under the highwall?

    <p>360m</p> Signup and view all the answers

    What is the approximate coal recovery percentage for highwall mining?

    <p>50%</p> Signup and view all the answers

    Which machine is NOT used in the Continuous Mining System?

    <p>Hydraulic Shovel</p> Signup and view all the answers

    When is In-Pit Crushing and Conveying (IPCC) used?

    <p>When haulage distances increase</p> Signup and view all the answers

    What is the key factor for success with any IPCC system?

    <p>The primary crusher</p> Signup and view all the answers

    What do Aqueous Methods in surface mining primarily employ?

    <p>Water or liquid solvent</p> Signup and view all the answers

    What is the common element shared by highwall miner and continuous mining machine?

    <p>Bit-laced cutting drum</p> Signup and view all the answers

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