323. Parcels in lease.

Mines and minerals1 included in a demise are usually described by reference to the surface under which they lie. Faults crossing a mineral area form natural boundaries between different mines, and are sometimes used to define the extent of the demise by reference to a line drawn on a plan showing the position or supposed position of the fault2. When a plan is indorsed on or annexed to the lease and referred to in it, the plan ought to be looked at as part of the description