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GATE 2025 MN – Question 36

Mining Geology, Mine Development and Surveying · Mining Geology · 2 marks · Multiple choice

Match P hydrothermal,Q metasomatic,R placer,S lateritic deposits to processes:I alteration by hot igneous solutions;II leaching soluble minerals leaving valuable residues near surface;III deposition from highly fluid magmatic solutions;IV transport and concentration of broken parent-rock material.

  1. P–III,Q–I,R–IV,S–II
  2. P–II,Q–IV,R–I,S–III
  3. P–III,Q–II,R–I,S–IV
  4. P–IV,Q–III,R–II,S–I

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Correct answer: (A) P–III,Q–I,R–IV,S–II

Explanation

Hydrothermal deposition uses hot solutions(III); metasomatism chemically replaces/alters rock(I); placers concentrate transported fragments(IV); lateritic weathering leaves residual concentrations(II). Therefore A. Distinguish deposition from solution from replacement of existing host minerals.

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