In The Lost Mine of Phandelver,
the story is about the lost mine which is on multiple occasions described as providing enough energy/magic for crafting a big variation of powerful magic items. Sadly I wasn't able to find anything more specific. At first I didn't care about it, but when in the end the players get a share of the mine, which also includes a magic forge, this now is an issue, since my players seem to want the campaign to continue after this adventure.
So given this land and property plus the specific feature connected with it, what can the net outcome of it expected to be? I have no clue and the official material doesn't given any hints.