In *The Lost Mine of Phandelver*,

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>  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.
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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.