Section 8(1)(b) in The Coal Bearing Areas (Acquisition And Development) Amendment and Validation Act, 1971
(b)any acquisition in pursuance of any notification issued under sub-section (1) of section 7 of the principal Act before the commencement of this Act may be made after such commencement and no such acquisition and no action taken or thing done (including any order made, agreement entered into or notification published) whether before or after such commencement, in connection with such acquisition shall be deemed to be invalid merely on the grounds referred to in clause (a) or any of them.