Paragraph 9

Where a determination to which this Schedule applies was in respect of the winning and working of minerals over a period ending on or after the first day of January, nineteen hundred and fifty-five, the Minister shall, on application made to him in that behalf in accordance with regulations under this Act, vary the determination, and amend, discharge or release any covenants or charges made or given in respect thereof, in such manner as appears to him appropriate for limiting the development charge to the winning and working of the minerals within so much of that period as preceded that day, and shall repay any sums paid thereunder so far as may be requisite for giving effect to the variation.