Question
Mine Planning Question on Determination of mine size and mine life
Four identical districts of a mine are ventilated with a quantity of 3500 m3/min at a fan drift pressure of 1.15 kPa. When one of the districts is sealed off, the change in resultant resistance is 0.072 Ns2m-8. If the fan is stopped, keeping a district sealed, the quantity through the mine becomes 850 m3/min. The natural ventilation pressure in Pa, is
A
72.12
B
82.28
C
105.56
D
144.56
Answer
82.28
Explanation
Solution
The correct option is (B): 82.28