What was conveyed or granted by the deed was, as I have already said, a profit à prendre. But more particularly it was a right to operate the mining property and its appurtenances and to win coal therefrom. But it was not an absolute right to do so; it was a right to do this subject to the payment of a fee and royalty totalling five shillings per ton for each and every ton of coal won. Furthermore, it was subject to determination in the event of failure to pay such fees and royalties. In a very real sense, therefore, it may be said that the "property" conveyed was a right to operate the mine and win coal subject to the payment of five shillings per ton as aforesaid. The question then is - treating the deed as a conveyance - what consideration was provided by the deed for the conveyance of this interest? In my view the answer to this enquiry is that no consideration was provided. Clearly enough, payments pursuant to cl. 4, if and when made, cannot be regarded as the consideration for the grant of such a right; they constitute both in form and substance payment for the actual use of the "facilities and the Company's land, pits, tunnels, mine workings, buildings, plant and machinery" and for the coal actually removed. And although it may be said that the respondents' covenants, including that contained in the cl. 4, constituted consideration in a general sense, this could not be said to be the consideration for the conveyance of a right to operate the mine and win coal subject to the payment in respect thereof of five shillings per ton. In other words, the stipulated rate of payment was, in much the same way as rent under a lease, intended by the way of "retribution or compensation" for the use of the mining property and for the coal won and so, in part, it delimited the character and extent of the right conveyed. It is true that the provisions of the Act which deal specifically with leases do in a general way purport to identify the rent payable under a lease with consideration for the lease but the schedule draws a clear distinction between the rent reserved and "any consideration by way of premium, fine or foregift" in that, in the case of a lease "in consideration of a sum of money by way of premium, fine or foregift" the same duty is imposed as that imposed upon a conveyance on sale whilst, in the case where no premium has been given, the duty imposed is calculated at the specified rate upon the yearly rent only. Where the lease provides both for a premium and for rent two calculations are necessary to ascertain the total duty - one, by applying the specified rate to the yearly rent and one, treating the premium as the consideration for the demise, as upon a conveyance on sale. It would be a strange result if, in view of those provisions, the respondent should be held to be at liberty to treat a lease as a conveyance and, consistently with his contention in this case, assess ad valorem duty on the whole of the rent payable during the term as the consideration for the "conveyance". The reality of the matter is that the parties to the deed in question in this case were content to conclude an arrangement in the form which it took in the deed and no consideration was provided for the actual "conveyance" of such a conditional right.