Mining is an artificial process. Rock doesn't jump out of the ground and present itself to be gathered like nuts and berries. Rock is not alive.
Rock is finite. There are very few processes Earth still carries out that increases land mass. Volcanoes add some land to Earth's surface, but, in comparison to the land lost it is small.
Mass is not the same as rock. Rock is mass, but, not all mass is rock. Mining takes on an interesting capacity when Earth is thought about as a planet and not simply a natural resource gold mine. Earth is not an ATM for the mining industry.
Before introducing the concept of mining as a loss of land, one has to think of Earth as a whole sphere and not simply segments.