17. If the cost of separating a mineral from waste rock becomes too great, the mineral may no longer be classified as
an ore. This happens because
a. the mineral can no longer be mined at a profit
b. the mineral has lost its usefulness
c. the demand for the mineral has decreased
d. none of the above
Answers: 2
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17. If the cost of separating a mineral from waste rock becomes too great, the mineral may no longer...
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