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Mining Engineering Miscellaneous In Mining Difficulty: Medium

The lowest temperature at which a fine dry coal dust cloud can be ignited is

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9 parts of the main scale division coinside with 10 parts of the vernier. The least count of vernier is . . . . . . . . CaF 2 composition of mineral called as The deposits must not exceed 5 - 6 m thickness, though 3m is considered to be economic limit in . . . . . . . . stoping. What is an essential characteristic of a sublevel caving method? The instrument which directly indicates the air velocity in m/sec. any point of observation.