User blog comment:JadenLan/New information about Remnant from WoR Vytal Tournament Festival/@comment-410526-20151010161931/@comment-24891101-20151010214715

Hold your horses. She merely agreed that it is plausible, not that it is likely. We still have zero evidence that this is in fact the case.

I actually did do some eyeballing of this problem a few months ago. It turns out that a lot of very large mining concerns in the real world use only a handful of mines, and some use only a single one. Granted, none of these are as massive as the SDC is, but it is quite possible for mines to be in continuous exploitation for centuries.