41. In case of an opencast blasting the danger zone comprises of area within the radius of
42. Load cell and convergence recorder is used
43. Vertical or steeply inclined openings is suitable for
44. Bhaska & Tipong method was practiced in
45. The parting left between any two seams or sections lying within 9 m of each other shall not be less than Am thickness at any place. A is given by
46. Adit is adopted for
47. At every below ground mine where more than A Persons are ordinarily employed belowground and there is no rescue station within its radius of 35 Km, the Owner shall establish a rescue room near the mine entrance. Ais given by
48. High production rates coupled with large scale and extensive subsidence results from the method of
49. Where any person is allowed to work or pass while the haulage is in motion, manholes for refuge shall be provided at intervals of not more than
50. Broken rock of 3684 m3 volume is heaped into a square pyramid of height 12 m. The surface area in m2 required is
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