61. 'Drop-war-wick' is used in u/g haulage track as a means of
62. In ultimate pit analysis the most widely used method is
63. Methanometer works on the principle of
64. The cap lamp used by the miners is
65. Six 100 w bulbs at a distance of 6 m gives a lighting of
66. An underground panel in a coal mine is being developed on B & P system. The pillar size is 30 m centre to centre and the adjacent galleries are 4 m wide. The percentage of extraction during development is
67. This method is used for mining narrow veins or pay streaks, where the ore occurs as a distinct band and can be separated easily from the wall rocks. The method of mining is known as
68. March the following:
Mining Method
Operation
a. Bord and Pillar
1. Long hole radial drilling
b. Sublevel caving
2. Splitting and Slicing
c. Longwall retreating
3. Loosening under strata pressure
d. Integrated Caving
4. Mechanical cutting
| Mining Method | Operation |
| a. Bord and Pillar | 1. Long hole radial drilling |
| b. Sublevel caving | 2. Splitting and Slicing |
| c. Longwall retreating | 3. Loosening under strata pressure |
| d. Integrated Caving | 4. Mechanical cutting |
69. Prior to starting opencast working some trenches are excavated to expose the mineral body. These trenches are generally very long but limited in depth. What is its approximate depth?
70. With low setting pressure
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