a) During the operational transformation process, equipment is used by skilled or semi-skilled operators to produce tangible or intangible goods.
b) In the case of a hard rock mine, explosives are an example of transforming inputs.
c) The value added at a mine is the difference between the selling price of the mineral and the costs of inputs (per unit)
 b and c
 a and c
 a and b
 a, b and c
 None of the above options (1, 2, 3, or 4) is correct.
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