Summarize the following court judgment. vil Appeal Nos. 4250 425 1 of 1986. From the Judgment and Order dated 9th August	 1985 of the Gujarat High Court in Spl. Civil Appln. No. 2471 of 1985 and 62 18 of 1983. Govind Dass	 S.H. Sheth	 Mrs. H. Wahi and M.V. Goswami for the Appellants. P.S. Potio	 T.U. Mehta	 and M.N. Shroff for the Respondents. The two appeals centre round the question of how to strike balance between the need of exploitation of the mineral resources lying hidden in the forests and the pres ervation of the ecological balance and to arrest the growing environmental deterioration and involve common questions of law. In the appeal arising out of special leave petition No. 12041 of 1985 the appellant firm had been granted a 565 quarry lease for the minor mineral black trap at section No. 73 of Village Morai of Taluka Pardi	 in the District of Valsad in the State of Gujarat. The lease was granted on or about 8th November	 1971 for a period of ten years. The area comprised of 13 acres of land for quarrying purpose. Three persons were granted 2 1/2 acres of land each and the re maining 5 1/2 acres of land were placed at the disposal of Industries	 Mines and Power Department for the purpose of granting quarry lease from the same. The case of the appel lant was that the said lands were dereserved from the forest area from 1971. On or about 3rd August	 1981 when the appellant 's term of lease was about to expire	 the appellant applied for renewal of lease asper rule 18 of Gujarat Minor Mineral Rules	 1966 (hereinafter called the said Rules). The appli cation of the appellant for renewal of lease was rejected by the Assistant Collector	 Valsad	 on the ground that the land fell under the "Reserved Forest" area and hence the (hereinafter called '1980 Act ') applied to the forests. The forest department of State of Gujarat refused to give 'no objection ' certificate. The contention of the appellant was that by the order dated 29th November	 1971	 the forest department had dereserved the said land from the reserved area and had allotted the land for the quarrying purpose to the appellant. The contention of the appellant was as the land was under the control of the Industries	 Mines & Power department	 the 1980 Act did not apply to the same. An appeal was preferred by the appel lant which was dismissed by the Director	 Industries	 Mines and Power department Government of Gujarat on or about 4th March	 1985. It is asserted by the appellant that on or about 29th January	 1983	 the Government had issued two circulars instructing the Director of Geology and Mining and other authorities not to issue the leases in the fresh area issued by the State Government. The appellant thereafter filed a writ petition in the High Court of Gujarat. The High Court of Gujarat dismissed the petition. The appellant has come up in appeal before this Court from the said decision. The appeal arising out of S.L.P. No. 12041 of 1985	 hereinafter mentioned as first appeal. The case of the appellants in the second appeal is that on diverse dates quarry leases. had been granted to the said appellants. There were ten of them. Eight of the appellants got their first renewal of their quarry leases in 1976 77. Appellant No. 9 applied for first renewal in August	 1979. Appellant No. 6 applied for first renewal on 20th July	 1982. In 1982	 some of the appellants except appellants 6 to 9 applied 566 for second renewal to the Collector. In December	 1982	 second renewals were refused by the Collector. Revision filed by the appellants against the order of the Collector was rejected by the Director	 Geology and Mining in 1983 and in December	 1983	 writ petition often described as special civil application was filed before the High Court	 challeng ing the refusal to renew. The High Court rejected the said writ petition. The second appeal herein arises out of the said decision in August	 1985 of the High Court of Gujarat. Both these appeals involve the question	 whether after coming into operation of 1980 Act	 the appellants were entitled to renewal either first or second of their quarry leases? In this connection it is necessary to refer to the 1980 Act. This was an Act passed by the Parliament to pro vide for the conservation of forest and for matters connect ed therewith or ancillary thereto. The Statement of Objects of the said Act is relevant. It is stated that deforestation caused ecological imbalances and led to environmental dete rioration. It recognised that deforestation had been taking place on a large scale in the country and it had thereby caused widespread concern. With a view to checking further deforestation	 an Ordinance had been promulgated on 25th October	 1980. The Ordinance made the prior approval of the Central Government necessary for dereservation of reserved forests and for the use of forest land for non forest pur poses. The Ordinance had also provided for the constitution of an advisory committee to advise the Central Government with regard to grant of such approval. The 1980 Act replaced the said Ordinance. The Act extends to the whole of India except the State of Jammu & Kashmir	 and came into force on 25th October	: 1980. Section 2 of the said Act is only relevant for our present purpose. It provides as follows: "2. Restriction on the dereservation of for ests or use of forest land for non forest purpose Notwithstanding anything contained in any other law for the time being in force in a State	 no State Government or other authority shall make	 except with the prior approval of the Central Government	 any order directing (i) that any reserved forest (within the meaning of the expression "reserved forest" in any law for the time being in force in that state) or any portion thereof	 shall cease to be reserved; (ii) that any forest land or any portion thereof may be used for any non forest pur pose. 567 Explanation. For the purposes of this section "non forest purposes" means breaking up or clearing of any forest land or portion thereto for any purpose other than re afforestation. " The said section makes it obligatory for the State Government to obtain the permission of the Central Govern ment for (1) dereservation of reserved forest and (2) for use of forest land ' for non forest purposes. It is apparent	 therefore	 that the two dual situations were intended to be prevented by the legislation in question.	 namely dereserva tion of reserved forest	 and use of forest land for non forest purposes. In the instant appeals leases for quarrying purposes had been granted prior to the coming into operation of the Act in question. Shri Gobind Dass	 learned counsel for the appellant in the first appeal and Shri Sheth learned counsel for the appellants in the second appeal contended that there was no question of extending for non forest purposes forest lands. There were existing quarry leases in one case first renewal was sought and in some other cases second or third renewals were being sought. Therefore these were at the relevant time dereserved forests. Neither of the two contin gencies sought to be prevented was there. The conditions precedent for the operation of the Act were not there in the facts of these appeals	 it was urged. Our attention was drawn to rule 18 of Gujarat Minor Mineral Rules	 1966 which were framed under the Act 67 of 1957 by the Government of Gujarat. The rules provided for the period of the lease	 renewals and availability of areas already granted and sub clause (b)(i) of the said rule 18 of the said Rules provides as follows: "(b)(i) The lease for all minerals specified in sub clause (i) of clause (a) may be renewed by the competent officer for one or more periods and the period of renewal at one time shall not exceed ten years and the total period for which the lease may be renewed shall not exceed twenty years in the aggre gate." Shri Sheth drew our attention to rule 3 of Part VIII (page 62) of the Manual which deals with the procedure of granting renewals under the rules. On the other hand Shri Mehta	 counsel for the respondents in the 568 first appeal and Shri Poti	 counsel for the respondents in the second appeal contended before us that after coming into operation of 1980 Act there was no question of renewal of the leases because this Act had prevented renewal of the lease without the approval of the Central Government. Shri Gobind Dass	 however	 placed strong reliance on State of Rajasthan vs Hari Shankar Rajendra Pal	 ; That was a decision dealing with Rajasthan Mines Minerals Concession Rules	 1958. This Court in that case was concerned with Rule 30 under Chapter IV under the said Rajasthan Rules. This Court observed that the word "may ' in the proviso in rule 30 in regard to the extension of the period by Government should be construed as 'shall ' so as to make it incumbent on Govern ment to extend the period of the lease if the lessee desired extension. The Rajasthan Rules provided	 inter alia	 as follows: "Period of lease A mining lease may be grant ed for a period of 5 years unless the appli cant himself desires a shorter period; Provided that the period may be extended by the Government for another period not exceeding 5 years with option to the lessee for renewal for another equivalent period	 in case the lessee guarantees invest ments in machinery	 equipments and the like	 at least to the tune of 20 times the value of annual dead rent within 3 years from the grant of such extension. The value of the machinery	 equipment and the like shall be determined by the Government. Where the lease is so renewed	 the dead rent and the surface rent shall be fixed by the Government within the limits given in the Second Schedule to these rules	 and shall" in no case exceed twice the origi nal dead rent and surface rent respectively	 and the royalty shall be charged at the rates in force at the time of renewal. " It was submitted by Shri Gobind Dass that the said rule was in pari materia with sub rule (b) of rule 18 of Gujarat Minor Mineral Rules 1966. Often when a public authority is vested with power	 the expression 'may ' has been construed as 'shall ' because power if the conditions for the exercise are fulfilled is coupled with duty. As observed in Craies On Statute Law	 7th Edition	 page 229	 the expression "may" and "shall" have often been subject of constant and con 569 flicting interpretation. "May" is a permissive or enabling expression but there are cases in which for various reasons as soon as the person who is within the statute is entrusted with the power	 it becomes his duty to exercise it. As early as 1880 the Privy Council in Julius vs Lord Bishop of Ox ford	 1880	 5 Appeal Cases	 214. explained the position. Earl Cairns	 Lord Chancellor speaking for the judicial committee observed dealing with the expression "it shall be lawful" that these words confer a faculty or power and they do not of themselves do more ' than confer a faculty or power. But the Lord Chancellor explained there may be some thing in the nature of the thing empowered to be done	 sometimes in the object for which it is to be done	 some thing in the conditions under which it is to be done	 some thing in the title of the person or persons ' for whose benefit the power is to be exercised	 which may couple the power with a duty	 and make it the duty of the person in whom the power is reposed	 to exercise that power when called upon to do so. Whether the power is one coupled with a duty must depend upon the facts and circumstances of each case and must be so decided by the courts in each case. Lord Blackburn observed in the said decision that enabling words were always compulsory where the words were to effectuate a legal right. Here the case of the appellants is that they have in vested large sums of money in mining operations. Therefore	 it was the duty of the authorities that the power of grant ing permission should have been so exercised that the appel lants had the full benefits of their investments. It was emphasized that none of the appellants had committed any breach of the terms of grant nor were there any other fac tors disentitling them to such renewal. While there was power to grant renewal	 and in these cases there were clauses permitting renewals	 it might have cast a duty to grant such renewal in the facts and circumstances of the cases specially in view of the investments made by the appellants in the areas covered by the quarrying leases	 but renewals cannot be claimed as a matter of right for the following reasons. The rules dealt with a situation prior to the coming into operation of 1980 Act. ' 1980 Act ' was an Act in recog nition of the awareness that deforestation and ecological imbalances as a result of deforestation have become social menaces and further deforestation and ecological imbalances should be prevented. That was the primary purpose writ large in the Act of 1980. Therefore the concept that power coupled with the duty enjoined upon the respondents to renew the lease stands eroded by the mandate of the legislation as manifest in 1980 Act in the facts and circumstances of these cases. The primary 570 duty was to the community and that duty took precedence	 in our opinion	 in these cases. The obligation to the society must predominate over the obligation to the individuals. For the same reasons we are unable to accept the view that the ratio of the decision of this Court in the case of State of Rajasthan vs Hari Shankar Rajendra Pal (supra) could be invoked in the facts and circumstances of these cases to demand renewal. Furthermore it appears to us from the affidavits in opposition filed on behalf of the respond ents that there were good Founds for not granting the renew al of the lease. The orders of the appropriate authorities in both these cases deal with the situation. Both Shri Gobind Dass as well as Shri Sheth	 however	 relied very heavily on the decision of this Court in State of Bihar vs Banshi Ram Modi and Others	 ; As the said decision dealt with section 2 of the 1980 Act	 it is necessary to refer to the facts of that case. There a mining lease for winning mica was granted by the State Government in respect of an area of 80 acres of land which formed part of reserved forest before coming into force of 1980 Act. However	 the forest land had been dug up and mining operations were being carried on only in an area of 5 acres out of the total lease area of 80 acres. While carry ing on mining operations	 the respondent came across two associate minerals felspar and quartz in the area. The respondent in that case	 therefore	 made an application to the State Government for execution of a Deed of Incorpora tion to include the said minerals also in the lease. Though the 1980 Act had come into force	 the State Government executed the Deed of Incorporation incorporating these items without obtaining prior sanction of the Central Government under section 2 of 1980 Act. Since the respondent in that case made a statement before the Court that he would carry on the mining operations only on 5 acres of land which had already been utilised for non forest purposes even before the Act came into force	 the question for determination was whether prior approval of the Central Government under section 2 of 1980 Act in the facts of that case was neces sary for the State Government for granting permission to win associate minerals also within the same area of 5 acres of land? This Court answered the question in negative and affirmed the judgment of the High Court. This Court observed at pages 647 and 648 of the report as follows: "The relevant parts of Section 2 of the Act which have to be construed for pur poses of this case are clause (ii) of and 571 the Explanation to that section. Clause (ii) of Section 2 of the Act provides that notwith standing anything contained in any other law for the time being in force in a State	 no State Government or other authority shall make	 except with the prior approval of the Central Government	 any order directing that any forest land or any portion thereof may be used for any non forest purpose. Explanation to Section 2 of the Act defines "non forest purpose" as breaking up or clearing of any forest land or portion thereof for any purpose other than reforestation. Reading them togeth er	 these two parts of the section mean that after the commencement of the Act no fresh breaking up of the forest land or no fresh clearing of the 'forest on any such land can be permitted by any State Government or any authority without the prior approval of the Central Government. But if such permission has been accorded before the coming into force of the Act and the forest land is broken up or cleared then obviously the section cannot apply. In the instant case it is not disputed that in an area of five acres out of eighty acres covered by the mining lease the forest land had been dug up and mining operations were being carried on even prior to the coming into force of the Act. If the State Government permits the lessee by the amendment of the lease deed to win and remove felspar and quartz also in addition to mica it cannot be said that the State Government has violated Section 2 of the Act because thereby no per mission for fresh breaking up of forest land is being given. The result of taking the contrary view will be that while the digging for purposes of winning mica can go on	 the lessee would be deprived of collecting felspar or quartz which he may come across while he is carrying on mining operations for winning mica. That would lead to an unreasonable result which Would not in any Way subserve the object of the Act. We are	 therefore	 of the view that while before granting permission to start. mining operations on a virgin area Section 2 of the Act has to be complied with it is not necessary to seek the prior approval of the Central Government for purposes of carrying out mining operations in a forest area which is broken UP or cleared before the commencement of the Act. The learned counsel for respondent 1 has also given an undertaking that respondent 1 would confine his mining operations only to the extent of five acres of land on which mining operations 572 have already been carried out and will not feel or remove any standing trees thereon without the prior permission in writing from the Central Government. Taking into considera tion all the relevant matters	 we are of the view that respondent 1 is entitled to carry on mining operations in the said five acres of land for purposes of removing felspar and quartz subject to the above conditions. " The aforesaid observations have been set in detail in order to understand the true ratio of the said decision in the background of the facts of that case. It is true that this Court held that if the permission had been granted before the coming into operation of the 1980 Act and the forest land has been broken up or cleared	 clause (ii) of section 2 of 1980 Act would not apply in such a case. But that decision was rendered in the background of the facts of that case. The ratio of any decision must be understood in the background of the facts of that case. It has been said long time ago that a case is only an authority for what it actually decides	 and not what logically follows from it. (See Lord Halsbury in Quinn vs Leathem) [1901] Appeal Cases 495. But in view of the mandate of Article 141 that the ratio of the decision of this Court is a law of the land	 Shri Gobind Dass submitted that the ratio of a decision must be found out from finding out if the converse was not cor rect. But this Court	 however	 was cautious in expressing the reasons for the said decision in State of Bihar vs Banshi Ram Modi & Others (supra). This Court observed in that decision that the result of taking the contrary view would be "that while digging for purposes of winning mica can go on	 the lessee would be deprived of collecting fel spar or quartz which he may come across while he is carrying on mining operations for winning mica. That would lead to an unreasonable result which will not in any way sub serve the object of the Act. " There was an existing lease where mining operation was being carried on and what was due by incorpo ration of a new term was that while mining operations were being carried on some other minerals were available	 he was given right to collect those. The new lease only permitted utilisation or collection of the said other minerals. In the instant appeals the situation is entirely differ ent. The appellants are asking for a renewal of the quarry leases. It will lead to further deforestation or at least it will not help reclaiming back the areas where deforestations have taken place. In that view of the matter	 in the facts and circumstances of the case	 in our opinion	 the ratio of the said decision cannot be made applicable to support the appellants ' demands in these cases because the facts are entirely diffe 573 rent here. The primary purpose of the Act which must sub serve the interpretation in order to implement the Act is to prevent further deforestation. The Central Government has not granted approval. If the State Government is of the opinion that it is not a case where the State Government should seek approval of the Central Government	 the State Government cannot apparently seek such approval in a matter in respect of	 in our opinion	 which it has come to the conclusion that no renewal should be granted. In that view of the matter and the scheme of the Act	 in our opinion	 the respondents were fight and the appellants were wrong. All interpretations must sub serve and help implementation of the intention of the Act. This interpreta tion	 in our opinion	 will sub serve the predominant purpose of the Act. In that view of the matter	 we are unable to sustain the submissions urged in support of these appeals. The appeals therefore fail and are accordingly dismissed. In view of the facts and circumstances of these appeals	 however	 we direct the parties to pay and bear their own costs. P.S.S. Appeals dismissed.

Sub clause (b)(i) of rule I8 of Gujarat Minor Mineral Rules	 1966	 which were framed under Act 67 of 1957	 pro vides that the lease for all minerals specified in sub clause (i) of clause (a) may be renewed by the competent officer for one or more periods not exceeding ten years at one time. Section 2 of the 	 brought into force on 25th October	 1980 provides that notwithstanding anything contained in any other law for the time being in force in a State	 no State Government or other authority shall make	 except with the prior approval of the Central Government	 any order directing (i) dereservation of reserved forest	 and (ii) the use of forest land for non forest purposes. The appellants had been granted leases for quarrying minor minerals prior to the coming into operation of the 1980 Act. Their applications for renewal of leases under r. 18 of the Rules were rejected by the competent authority on the ground that the lands fell under the reserved forests which were governed by the 1980 Act. Their revision applica tions failed	 and the High Court also rejected the writ petitions filed by them. 563 In the appeals by special leave	 it was contended for the appellants that the conditions precedent for the opera tion of the Act were not existing	 that there was no ques tion of extending for non forest purposes forest lands	 since their 's were existing quarry leases in areas which were at the relevant time dereserved forests	 that they had not committed any breach of the terms of grant nor there were any other factors disentitling them to such renewal	 that the words 'may be renewed ' in r. 18(b)(i) should be read as 'shall be renewed '	 and so read they make it incum bent on the Government to renew the lease if the lessee so desired	 and as they had invested large sums of money in mining operations a duty was cast on the authorities to exercise the power granting permission in a manner that they could receive full benefit of their investments. For the respondents it was contended that after the coming into operation of 1980 Act there was no question of renewal of the leases because it had prevented renewal of lease without the approval of the Central Government. Dismissing the appeals	 the Court	 HELD: 1. Whether the power is one coupled with a duty must depend upon the facts and circumstances of each case and must be so decided by the Courts in each case. [569D] I.2 The Gujarat Minor Minerals Rules	 1966 dealt with a situation prior to the coming into operation of the . While under r. 18 of the Rules there was power to grant renewal	 which might have cast a duty on account of the investments made by the appellants in the areas covered by the quarrying leases	 they could not claim renewals as a matter of right after the Act was brought into force. Their applications were rejected on good grounds. The orders of the appropriate authorities deal with the situation. Julius vs Lord Bishop of Oxford	 [1880] 5 Appeal Cases 214 and Craies on Statute Law	 7th Edn. 229	 referred to. 2.1 All interpretations must subserve and help implement the intention of the Act. The primary purpose of the Act of 1980 is to prevent further deforestation and ecological imbalances. Therefore	 the concept that power coupled with duty enjoined upon the respondents to renew the lease	 stands eroded by the mandate of the legislation manifest in the Act. The primary duty was to the community and that 564 took precedence over the obligation to the individuals. [573C	A	569H 570A] 2.2 The appellants are asking for renewal of the quarry leases. It will lead to further deforestation or at least it will not help reclaiming hack the areas where deforestations have taken place. The Central Government has not granted approval. If the State Government was of the opinion that this was not a case where it should seek approval of the Central Government	 the State Government could not apparent ly seek such approval. [572G	 S73A] 3. The ratio of any decision must he understood in the background of the facts of that case. A case is only an authority for what it actually decides	 and not what logi cally follows from it. [572C] Quinn vs Leathem	 [1901] Appeal Cases 495	 referred to. State of Rajasthan vs Hari Shankar Rajendra Pal	 ; 	 State of Bihar vs Banshi Ram Modi and Others	 ; 	 distinguished.