All acts of executive authority done, proceedings taken and sentences passed under the Mines and Minerals (Regulation and Development) Act, 1948 (53 of 1948), with respect to the regulation of mines and the development of minerals during the period commencing on the 26th day of January, 1950, and ending with the date of commencement of this Act by the Government or by any officer of the Government or by any other authority, in the belief or purported belief that the acts, proceedings of sentences were being done, taken or passed under the said Act, shall be as valid and operative as if they had been done, taken or passed in accordance with law, and no suit or other legal proceeding shall be maintained or continued against any person whatsoever, on the ground that any such acts, proceedings or sentences were not done, taken or passed in accordance with law.

---