Mn:mining Engineering Worksheet - 2013 Page 12
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152013
MINING ENGG. –MN
Common Data for Questions 50 and 51:
The following observations are taken during a closed traverse.
Side
Length (m)
WCB
AB
100
90°
BC
173
180°
CA
200
330°
Q.50
The closing error of the traverse in mm is
(A) 205
(B) 20.5
(C) 2.05
(D) 0.205
Q.51
The reduced bearing of the closing error in degrees is
(A) 87.21
(B) 64.03
(C) 14.04
(D) 0
Linked Answer Questions
Statement for Linked Answer Questions 52 and 53:
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.
Grade (%Fe)
Net value of ore (Rs/tonne)
64.5
3200
60.2
1800
Q.52
Assuming linear relationship between the net value and grade, the break-even cut-off grade
in % Fe is
(A) 52.2
(B) 54.7
(C) 58.0
(D) 62.2
Q.53
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),
z
0.00
0.01
0.02
0.03
0.04
0.6
0.72575
0.72907
0.73237
0.73565
0.73891
0.7
0.75803
0.76115
0.76424
0.76730
0.77035
0.8
0.78814
0.7 9103
0.79389
0.79673
0.79954
0.9
0.81594
0.81859
0.82121
0.82381
0.82639
1.0
0.84134
0.84375
0.84613
0.84849
0.85083
the percentage of waste in the deposit based on the break-even cut-off grade is
(A) 78.8
(B) 71.2
(C) 28.8
(D) 21.2
MN
12/15
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