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Most of this post isn't even about geology....it's about thermodynamics. Which was only touched upon within the general geological question.
Actually, the question was rather poorly conceived (no offense, Ray). If it was a question about thermodynamics as pertaining to the chemical processes which drive ore deposition, then it should've addressed thermodynamics within aqueous solutions and chemical equilibrium reactions. In any case, the 2nd law pertains to isolated physical systems undergoing irreversible equilibration, which is something an ore deposit is not....isolated. There are always external inputs into ore formation systems. Given the right conditions, the reversal of the reactions which initially formed an ore deposit can occur. Meaning it's not entirely an irreversible process.
If it was a general thermodynamics question, then it should've been addressed in such a fashion.
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