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If a deposit yields 1 tonne of saleable clay for every 8 tonnes excavated, what percentage is recovered as product?

  • A.8 per cent
  • B.80 per cent
  • C.25 per cent
  • D.12.5 per cent

Answer: D

One in eight is one eighth, or 12.5 per cent. Recovery figures of this order govern both the economics of a deposit and the quantity of waste that has to be disposed of. Waste handling is a major part of the cost of clay production.

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