[quote=@catchamber]
>Stable microscopic black holes

[hider=This can only end well.][img]https://68.media.tumblr.com/e8ab312ca9dcfd9daa68a9079f3f9c4c/tumblr_ny1z9v8ees1tslewgo1_500.gif[/img][/hider]

[/quote]Yeah, you'd need a quite huge black hole to accomplish that, actually. Likely at least a few orders of magnitude heavier than the said planet.

What would a micro black hole do which was magically made stable? It'd keep falling in and out of the planet while likely excavating a relatively small hole in the process. So basically it'd be more like an unstoppable bowling ball which keeps circling in and out of the planet while growing ever so slightly in the process. If light enough it might also stop in the core and stabilize there, basically just adding a tiny mass to the planet. Although it might influence tectonic movements on the long run.

In the end all that the black hole is just mass. Highly concentrated for sure but it still behaves like any other object.

Also realistic micro black holes would be akin to a mini sun if not even more intense, they would be white-hot as they spread radiation leakage everywhere. That's actually how they are supposed to work as energy source. Basically you just replace nuclear reactors with a black hole and you can keep the rest of the apparatus.