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 (C)</p> Signup and view all the answers

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

<p>2.5m (A)</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 (D)</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 (D)</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 (A)</p> Signup and view all the answers

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

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

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

<p>Gunpowder (A)</p> Signup and view all the answers

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