Western Pastoral Co v Eyeington

The High Court of Australia considered a dispute between Western Pastoral Co and Eyeington concerning the interpretation of a lease agreement. The core of the disagreement lay in whether the lease, which granted the lessee the right to occupy and use certain land for pastoral purposes, included an implied term that the lessor would not take any action that would substantially interfere with the lessee's use and enjoyment of the land.

The central legal question before the Court was whether, in the absence of express terms to that effect, a lease of land for pastoral purposes contained an implied covenant on the part of the lessor not to derogate from the grant. This involved an examination of the nature of the rights conferred by a pastoral lease and the extent to which the lessor's retained rights could be exercised without infringing upon those granted to the lessee.

The Court held that a covenant not to derogate from the grant is implied in every lease. This implied covenant requires the lessor to refrain from doing anything that substantially interferes with the use of the demised premises for the purpose for which the lease was granted. In this instance, the Court found that the lessor's actions, which involved the construction of a dam that flooded a significant portion of the leased land, constituted a substantial interference with the lessee's pastoral operations and therefore amounted to a derogation from the grant. The Court applied the principle that the law will imply such covenants as are necessary to give business efficacy to the contract, or as are of common understanding between parties in such a situation.

The High Court allowed the appeal, finding that the lessor had indeed derogated from the grant. The matter was remitted to the Supreme Court of Queensland for assessment of damages.