Validation of certain Acts

All acts of executive authority done, proceeding taken and sentences passed under any enactment made by Parliament on or before the first day of December, 1963, and in force immediately before the appointed day with respect to the regulation of mines and development of minerals in the State by Government or by any officer of the Government or by any other authority, in the belief or purported belief that the acts, proceedings or sentences were being done, taken or passed under the said enactment, 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 proceedings shall be maintained or continued against any person whatsoever on the ground that any such act, proceeding or sentence were not done, taken or passed in accordance with law.