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Which section of the Mines Act 1952 gives power to Inspectors to prohibit employment in mines? The quantity of coal available in a coal seam insitu called Finger nail scratch upto about hardness of The manager of a below ground mine where more than 100 persons are ordinarily employed below ground shall ensure that at least 'A' numbers of rescue trend persons are readily available at surface at any time. A is given by Underground coal mines are in principle ventilated by exausting system, so that