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GATE 2024 MN – Question 42

Mining Methods and Machinery · Mining Methods · 2 marks · Multiple choice

Match geometry P tabular/moderately steep, Q tabular/flat, R massive/steep; strength L strong, M moderate, N weak; support X unsupported, Y artificial, Z self-supported; methods 1 cut-and-fill, 2 block caving, 3 room-and-pillar.

  1. P–L–Y–3; Q–N–Z–1; R–M–X–2
  2. P–M–Y–2; Q–N–Z–1; R–L–X–3
  3. P–L–Y–2; Q–M–Z–3; R–N–X–1
  4. P–M–Y–1; Q–L–Z–3; R–N–X–2

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Correct answer: (D) P–M–Y–1; Q–L–Z–3; R–N–X–2

Explanation

Cut-and-fill suits the tabular dipping body with moderate strength and added fill support(P–M–Y–1). Room-and-pillar retains strong pillars in a flatter body(Q–L–Z–3). Block caving uses a massive caveable weak body(R–N–X–2). These three matches give D.

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