(ii) The expression "winning" in Art. 31A(l)(e) should be construA ed to mean "getting or extracting minerals from the mines and other incidental purposes." (701 DJ The various definitions in the Act or the rules are for a limited purpose and the word 'winning' or 'win' does not always have the same content, and, therefore, they cannot be any guide for construing the word 'winning' in the constitutional provision of Art, 31A(l)(e). Therefore B the rules for the modification of any rights accruing under this lease cannot be deemed to be void on the ground that they take away the rights conferred by Arts. 14, 19 or 31 of the Constitution. {702 C-E] (iii) The 1956 rules were made in connection with the regulation of mines and for the deve)opment of minerals and the Central Legislature was competent to provide for the making of such rules by tho 1948 Act. The rules do not come within the field of the acquisition and requisitionc ing of property. (702 HJ (iv) Even if the rules were not consistent with the provisions of tho 1948 Act and were therefore void, they could be continued after the enforcement c.f the 1957 Act. The effect of s. 29 of the 1957 Act is that the rules which were made or purported to have been made under the 1948 Act in respect of matters for which rules could be made under the 1957 Act would be deemed to D have been made under the 1957 Act as if that Act had been in force on tho date on which such rules were made and would continue in force. [703 E, GJ ( v) The Controller was competent to modify the terms of the lease in favour of the appellant in order to bring it into conformity with the provisions of the 1957 Act 1llld the rules under s. 13 thereof. [704 F] Per Hidayatullah and Bachawat, JJ. The appeal must be dismissed. E The lease in 1939 was the only subsisting lease. In order to bring the leas• in conformity with the Act and the Rules, its period could be cut down to 20 years from 1939. Actually the Controller cut down the period to 25 years from 1939. The appellants had no just grievance against this order. (705 H; 706 A] CIVIL APPELLATE JURISDICTION: Civil Appeal No. 428 of 1964. F Appeal by special leave from the order dated 30th January 1962 of the Government of India, Ministry of Steel, Mines and Fuel (Department of Mines & Fuel). New Delhi-I in case No. M-II-29 (26)/60. G. L. Sanghi, J. B. Dadachanji, 0. C. Mathur and Ravinder Narain, for the appellant. G Niren De, Addi. Solicitor-General, R. Ganapathy Iyer and R. H, Debar, for respondent Nos. I and 2. R.H. Dhebar, for respondent No. 3. E. C. Agarwala and M. S. Gupta, for respondents Nos. 4-20, 22---25 and 28 to 31. H The Judgment of SUBBA RAo, c. 1., Soou and RAGHUB,l.R DAYAL, JJ. was delivered by DAYAL, J. The dissenting Opinion