28. Extent of area affected by presumption from acts of ownership.

As the act of working minerals1 constitutes a removal, pro tanto, of that which gives a particular place its value, the question arises how far constructive possession of a wider area can be inferred from actual possession of a limited area. Thus acts of taking or dealing with minerals under certain land are evidence of the ownership of the minerals under other land within the same boundaries2, and if possession is taken under a document constructive possession will be inferred of so many seams