intendment upon the whole of the facts: see Dennett v. Grover (1),
and that the District Court Judge had materials before him upon which he might reasonably arrive at his conclusions upon this subject, and therefore that the limit of ten men and six days a week must be taken to be part of the terms of the tribute.
Now, it was expressly made one of the terms of the bargain that the authority to mine was to continue for the full period of six months. The appellants contend that they revoked it at all events on 2nd May 1907, according to the findings of the District Court Judge, and that all proceeds after that date should be fully accounted for on the footing of unauthorized trespass.
First, as to the actual fact of revocation, I think there was evidence upon which the learned Judge could come to his con- clusion, and that in this case is the only point for consideration on that branch. The evidence points to a temporary revocation or suspension on 2nd May intended to last until certain precautions for safety were adopted, and before they were taken the appellants definitely determined to put an end to the tribute, and did SO. So that, if the agreement was legally revocable, it was in fact revoked as from 2nd May.
The respondents cannot advance their case beyond that of a merely revocable licence unless they can establish a grant of the interest in the land: Webber v. Lee (2), or an agreement for valuable consideration specifically enforceable, or conduct raising an equity in their favour. Putting it briefly, they must show grant, contract, or estoppel.
The first is, of course, out of the question; the second cannot be maintained because even if it were in writing the respondents were under no obligation to work or to pay anything unless they did work, and then only in respect of their actual winnings; and the only real question arises under the head of estoppel.
If the respondents, in the just and reasonable expectation and belief that the appellants would in pursuance of the arrangement actually made allow them to continue mining operations for the full period of six months, had been encouraged or knowingly permitted by the appellants to expend to their prejudice money upon or in connection with those operations, SO as to provide
(2) 9 Q.B.D., 315.