What makes a rock an ore A. It has to contain metal. B. It has to be igneous in origin. C. It has to be able to be mined economically. D. It has to be able to be dug out of the ground.?

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What makes a rock an ore A. It has to contain metal. B. It has to be igneous in origin. C. It has to be able to be mined economically. D. It has to be able to be dug out of the ground.?