Question #8d2f4

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SCooke
Sep 8, 2017

C) An "ore" is a mineral rock that contains enough metal for economical extraction.

Explanation:

a) If metal cannot be produced from it, it is not an ore, and may not be a mineral either.
b) Metal might be extractable from any mineral, but only those with economic recovery potential are called ores.
d) Neither the cost of the extraction nor the produced metal is part of the definition of an ore.

A very good previous description of the terminology, examples and differences is here:
https://socratic.org/questions/what-is-the-difference-between-rock-mineral-ore-and-metal

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