Select the correct option to test your answer:
More Mining Engineering Questions
The resistance which a body offers to being pulled asending by tensile force is called
An ore block of length 30m and height 20m having an average width of 1.5m with sharp boundary walls is mined with a minimum mining width of 2m. If the tonnage factors are 3 t/m 3 for ore, 2 t/m 3 for wall rock and average grade of ore is 10%, the diluted grade of ore mined in percent is
The shear forces, intensity is lowest when the coal and floor beds are
When two tubs shall be deemed to be in dose succession, when the distance between them at any time is less than . . . . . . . . meter.
An underground panel extracted in a coal mine has a strike length of 500 m. After subsidence survey, it was found that the length of a straight line between the extreme limits of the subsided area on surface is 593.2 m along the strike direction. The depth of the extracted panel from the surface is 100 m. The angle of draw for the overlying strata assuming identical subsidence on either side of the centre of the panel is