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Prospecting and Exploration Questions and Answers

1.

Kimberlite and lamproite pipes are explored for :

Exam Year(s)

MH SET - 2018, SET Exam - 2018,

Answer: A

Kimberlite and lamproite pipes are explored for Diamond.

Kimberlite and lamproite are ultrapotassic magmas that rise rapidly from depths of 150 km or more, within the diamond stability field, and carry diamonds to the surface in carrot-shaped pipes. They are the primary source rocks of diamond; the Majhgawan pipe near Panna in Madhya Pradesh is India's best-known example.

Beryl is found mainly in granite pegmatites, corundum in metamorphic rocks and silica-poor igneous rocks, and quartz is ubiquitous, so none is the target of pipe exploration.

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2.

Copper in a calcareous environment is :

Exam Year(s)

MH SET - 2023, SET Exam - 2023,

Answer: B

Copper in a calcareous environment is Immobile.

The mobility of copper depends strongly on pH. In acid conditions copper dissolves readily as Cu2+, which is why copper leaches from oxidising sulphides. In calcareous (carbonate-rich, alkaline) surroundings the high pH makes it precipitate as carbonates such as malachite and azurite, or adsorb onto clays and oxides, so it hardly moves.

This is why secondary copper minerals collect where acid solutions from oxidising ore meet limestone. 'Mobile', 'partially mobile' and 'sometimes mobile' describe acid or variable conditions, not a carbonate setting.

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