List of top Mining Geology, Mine Development and Surveying Questions asked in GATE MN

Reciprocal levelling is performed for points P and Q by placing the same levelling instrument at A and B. The observations of staff readings are tabulated as below. 

If the Reduced Level (RL) of P is 115.246 m, then the true RL of Q, in m, is _______ (rounded off to 3 decimal places)
 

In a shovel dumper combination, the loading time of a dumper is 3 minutes. The shovel serves 8 dumpers. If the cycle time of a dumper, including its loading time, is 22 minutes, the waiting time of a dumper, in minutes, is:

Match the source of error with the corresponding correction in surveying with steel tape.


 

A non-transit theodolite does NOT have
Water is pumped from a mine sump at the rate of 300 m3/hr to an inverted conical water tank, as shown. The rate of rise in water level in m/min, at the instant water level reaches at 5 m height from bottom of the tank, is____.(round off up to 2 decimals)
Water is pumped from a mine sump at the rate of 300
In a tacheometry survey, the readings observed are given.
Instrument StationStaff StationBearing of line of sight Vertical angle Staff  readings (m)
pA145°+8°1.2, 1.7, 2.2
 B205°+3°0.8, 1.2, 1.6
The additive and multiplying constants of the instrument are 0 and 100, respectively. The length of the line AB in m, is____.(round off up to 2 decimals)
A scanline survey between points A and B of a rock mass is shown. Consider
RQD =100×(0.12+1)×exp(−0.1λ), 
where, λ is the frequency of discontinuity per m. The RQD of the rock mass is_____. (round off up to 2 decimals) 
A scanline survey between points A and B of a rock mass
A rectangular development heading of dimension 3 m x 2.8 m is to be blasted with holes of 2.4 m in length. If the pull factor is 0.95 and swell factor is 1.20, the volume of blasted rock per round, in m3, is_____.(round off up to 2 decimals)
The percentage Fe and corresponding net value for an iron ore mine is given below
Fe (%) Net value (INR per tonne) 
584000
624500
Assuming net value versus grade curve to be a straight line, and mining cost of waste is INR 1000 /m3; the correct representation of stripping ratio, SR (m3/tonne) versus Fe (%) grade curve is
A rectangular mine airway of 2.0 m width and 2.5 m height has a bend with deflection of π/4 radian. If the radius of curvature of the bend is 4.0 m, the shock factor of the bend is (round off to three decimals)
A coal seam of uniform thickness 12 m dips at 30$^\circ$. The ultimate pit limit is based on an instantaneous stripping ratio of 10 m$^3$/tonne and a safe slope angle of 45$^\circ$. Coal density = 1.41 tonne/m$^3$. Find length $L$ in m (rounded off to two decimals).
The correct order of pavement layers for a haul road from top to bottom is
The correct vertical stress profile in the case of tributary area method for pillar design is

In a surface mine, third bench from the pit bottom is blasted, as shown in the figure. The width, height, and slope angle of each bench are 8 m, 6 m, and 80\(^\circ\), respectively. A fly rock is projected at an angle of 45\(^\circ\) with the horizontal with initial velocity, v. If the acceleration due to gravity is 10 m/s\(^2\), then the minimum velocity (v) in m/s required for the fly rock to reach just beyond toe of the pit slope is \(\underline{\hspace{1cm}}\). (round off to 2 decimal places) 

The pit bottom in a correlation survey is shown in the figure. Points C and D represent two suspended wires. The bearing of line CD is 286°00'00'' and its length is 4.64 m. The angle CED is measured as 00°00'40''. The length of line DE is 5.46 m. Considering the Weisbach triangle method, the bearing of the line CE is 

With reference to the figure related to rock cutting by point attack tool, match the angle with corresponding name. 

In an analysis of fragmented blast muck, the mean fragment size is found to be 60 cm with uniformity index of 1.25. Considering Rosin-Ramler equation, the cumulative mass fraction, in percent, to pass the grizzly screen size of 100 cm is \(\underline{\hspace{1cm}}\). (round off to 2 decimal places)
For a dumpy level, the bubble tube has sensitivity of 40" for one division. While taking a staff reading at a distance of 60 m, the bubble is out of centre by 2 divisions. The error in staff reading in mm is \(\underline{\hspace{1cm}}\). (round off to one decimal place)
On an old plan of scale 1:1000, leasehold area of a mine is now measured as 802 cm^2 using a planimeter. The plan is found to have shrunk, such that the original line of 10 cm is now measured as 9.8 cm on the plan. True lease hold mine area, in m^2 is \(\underline{\hspace{2cm}}\) (round off to the nearest integer).
Folds are the structural features resulting from
In photogrammetry, the 'Tilt of a photograph' refers to the angle between the
NONEL is used as down-the-hole initiator to
Tricone roller bit is used with