Surface Mining Mechanical Extraction Methods Quiz
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Questions and Answers

What is the primary purpose of auger mining?

  • Preventing surface subsidence and spontaneous combustion
  • Draining acid-laden water from the mining area
  • Recovering coal under the highwall after strip mining (correct)
  • Extracting coal from deep underground mines

    • What is the main drawback of auger mining?

  • Causing surface subsidence and spontaneous combustion
  • Recovering coal at a high cost
  • Creating drainage holes for acid-laden water
  • Leaving about 65% of the coal reserve in place (correct)

    • What is the depth to which auger holes may be drilled?

  • Less than 50 m
  • Depends on the coal seam thickness
  • More than 90 m (correct)
  • Exactly 100 m

    • What is the mechanism by which coal is extracted in auger mining?

    <p>Rotating action of the auger cutting head</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>360 meters</p> Signup and view all the answers

    What percentage of coal recovery is typical for highwall mining?

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

    What is a key advantage of the highwall miner over auger mining?

    <p>Ease of adjustment to varying seam thickness</p> Signup and view all the answers

    What is the primary function of a continuous mining system surface miner?

    <p>Loosening of rock, crushing, and loading on transportation system</p> Signup and view all the answers

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

    <p>When haulage distances increase and skilled labor is scarce</p> Signup and view all the answers

    What do aqueous extraction methods in surface mining use?

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

    What is the common element between highwall mining and auger mining?

    <p>Recovering coal under the highwall</p> Signup and view all the answers

    What is the primary purpose of auger mining?

    <p>Recovering coal under the highwall after strip mining</p> Signup and view all the answers

    What is a key disadvantage of auger mining?

    <p>High risk of surface subsidence and spontaneous combustion</p> Signup and view all the answers

    What is the primary difference between open-pit mining and auger mining?

    <p>Open-pit mining involves extracting minerals from a large open excavation, while auger mining recovers coal under the highwall</p> Signup and view all the answers

    What is the depth to which auger holes may be drilled?

    <p>More than 90m</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 primary function of a continuous mining system surface miner?

    <p>Crushing the rock to small particle size</p> Signup and view all the answers

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

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

    What is a key advantage of the highwall miner over auger mining?

    <p>Higher production rate</p> Signup and view all the answers

    What is the main drawback of auger mining?

    <p>Lower coal recovery percentage</p> Signup and view all the answers

    What is the mechanism by which coal is extracted in auger mining?

    <p>Rotating cutting drum</p> Signup and view all the answers

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

    <p>When system capacities increase</p> Signup and view all the answers

    What do aqueous extraction methods in surface mining use?

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

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