Mastering Manual Opencast Mining
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Questions and Answers

Which method is used for blasting in manual opencast mining?

  • TNT
  • Gun powered explosives (correct)
  • Dynamite
  • Nitroglycerin

    • What is the diameter of the holes drilled in manual opencast mining?

  • 37mm (correct)
  • 25mm
  • 10mm
  • 50mm

    • How are the overburden and minerals removed in manual opencast mining?

  • By using excavators
  • By manual loading in tubs (correct)
  • By using trucks
  • By using conveyor belts

    • What are the small pillars of rock left for measurement in manual opencast coal mining called?

    <p>Sakhi</p> Signup and view all the answers

    What is the maximum height of 'sakhi' allowed in manual opencast coal mining?

    <p>2.5m</p> Signup and view all the answers

    Which method is used for loading the overburden and minerals in manual opencast mining?

    <p>By manual loading in tubs</p> Signup and view all the answers

    What is the purpose of dividing the opencast mine area into two sections in manual opencast coal mining?

    <p>To facilitate measurement of excavated volumes</p> Signup and view all the answers

    What is the purpose of leaving small pillars of rock in manual opencast coal mining?

    <p>To measure the volume of excavated coal</p> Signup and view all the answers

    What is the maximum depth of the holes drilled in manual opencast mining?

    <p>1.8m</p> Signup and view all the answers

    What type of explosive is used for blasting in manual opencast mining?

    <p>Gunpowder</p> Signup and view all the answers

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