Section 6(2)(b) in Coal Mines (Taking Over of Management) Act, 1973
(b)The Central Government may also appoint one or more persons as Additional Custodian-General or Deputy Custodian-General for assisting the Custodian-General in the exercise of his powers and duties under this Act and the Custodian-General may delegate all or such of his powers, as he may think fit, to the Additional Custodian-General or Deputy Custodian-General.