Discussion
Assertion (A): A quarry may work a low-grade bench alongside a high-grade one rather than leaving it in the ground.
Reason (R): Blending the two in proportion gives a feed of the required average chemistry.
Answer: B
Both are true and the reason gives the advantage: material that would be waste on its own becomes usable when blended, which both extends the reserves and reduces the quantity of corrective material that has to be bought in.
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