124. Implied grant of support.

An easement of support for artificial structures may be the subject of an implied or deemed1 grant if and to the extent that a contrary intention is not expressed in the relevant disposition. It differs from a restriction imposed on the working of mines2 in that it does not prohibit working within any area; the mine owner, as in the case of a natural right, is free to work, provided he substitutes efficient artificial support3. If the common owner of the land and the subjacent mines transfers the land to another, but at the same time retains his ownership