(1) A holder of a mining lease desirous of seeking modifications in the approved mining plan as are considered expedient, in the interest of safe and scientific mining, conservation of minerals, or for the protection of environment, shall apply to the Controller General, 2 [ or the officer authorised in this behalf by the State Government, as the case may be,] setting forth the intended modifications and explaining the reasons for such modifications.
(2) The Controller General or the authorised officer, 3 [or the officer authorised in this behalf by the State Government, as the case may be,] may approve the modifications under subrule (1) 4 [or approve with such alterations as he may consider expedient within a period of ninety days.]