When someone owns land, is it to a certain depth or all the way to the center of the earth?

Jacqueline, this question of yours is an eye opener on mine side. In our beloved country anyone owning land can use it as he wish. Only exception comes when they realize it has a mineral deposit. That is when that land is not yours at all. It belongs to the government. But to answer the question, without all those precious metals, you can dig it to where you can reach.