Section 6(2)(a) in Coal Mines (Taking Over of Management) Act, 1973
(a)The Central Government may also appoint a person (including a Government company, whether in existence at the commencement of this Act or incorporated thereafter) as the Custodian-General for exercising supervision and control over all the coal mines the management of which is taken over under this Act and on such appointment, every Custodian, appointed under sub-section (1) , shall act under the guidance, control and supervision of the Custodian-General.