Mining Engineering
2017 · Paper 1
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Complete GATE MN 2017 Paper 1 overview, original pages and practice · Timed previous-paper practice
Questions 31–33 of 65. Imported answers require review unless explicitly marked reviewed.
Question 31
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Total ore mined from a sub-level open stope of a copper deposit is measured to be 10000 tonne. The ore recovery and ore dilution during stoping are 90% and 20% respectively. The in situ Cu grade of the ore in the stope is 0.65%. The selling price of copper is Rs. 400/kg of metal. Ignoring any other metal losses in the downstream process of the ore, the revenue generated by selling the ore in Crores of rupees is
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The block grade model of an ore deposit is shown in the figure below.
The relationship between block value per tonne (
) in rupees and the block grade in percentage (
) is given below:
, for
, otherwiseIf each square block contains 1000 tonne of material and the overall pit slope angle is
, the total value of the pit determined by the floating cone algorithm in Lakhs of rupees isLog in to check the answer
You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 33
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A mine is being developed by bord and pillar method with a gallery size of 4.8 m × 2.4 m. The mine operates in 3 shifts per day and 6 faces are blasted per shift. The average pull per round of blast is 1.2 m and the bulk density of coal is 1.4 t/m³. If the OMS is 2.5, then the average manpower deployed in the development section per shift is
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