law: 2[30. Power of revision by Central Government.
  The Central Government may, of its own motion or on an application made within the prescribed time by an aggrieved party,
  (a) revise any order made by a State Government or other authority in exercise of the powers conferred on it by or under this Act with respect to any mineral other than a minor mineral; or
  (b) where no such order has been made by the State Government or other authority in exercise of the powers conferred on it by or under this Act with respect to any mineral other than a minor mineral within the time prescribed therefore, pass such order as it may think fit and appropriate in the circumstances:
  Provided that in cases covered by clause (b) the Central Government shall, before passing any order under this clause, give an opportunity of being heard or to represent in the matter.]