345. Determination of tenancy by lessee.

345.     Determination of tenancy by lessee.

Some mining leases contain a clause empowering the lessee to determine the tenancy as soon as the minerals are exhausted or in some other event1. To determine the term effectively, all conditions, such as giving notice2 or the performance of covenants or otherwise, to which the exercise of the power is made subject must be strictly observed3. A power for the lessee to give notice at any time authorises him to give a notice expiring during the currency of a year4. A power to determine in case of accident is not