Discussion
Copper in a calcareous environment is :
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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