Whether a given ore deposit is economic depends on the metal concentration,not on the mineral in which that metal occurs.
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Q35: In the United States,we use many times
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Q37: The concentration factor of an ore is
Q38: Abandoned quarries
A) Can be left without reclamation,
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Q43: A problem with substituting plastics for metals,to
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Q45: Limestone is the source for Portland cement,the
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