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Discussion :: GATE Mining Engineering

  1. Economic analysis of an iron ore deposit reveals that the net value of the ore is related to the grade mined as shown in the table.

    Assuming that the grade follows normal distribution with mean 62.7%, and standard deviation 10.0% (A portion of the standard normal distribution table is given below),

    the percentage of waste in the deposit based on the break-even cut-off grade is
    2. A.
    78.8
    B.
    71.2
    C.
    28.8
    D.
    21.2

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    Answer : Option D

    Explanation :

    -NA-

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