The only race that you would get some "love" from are in fact the Deep gnomes, so prepare for conflict-based encounters when running into drow/duergar, thats my understanding of it.
I think the drow see the areas as "their" property when it comes to mining, but the Underdark is big...
One possible opening might be, if developed, the Old Skull Descent, where there is (an embryo of?) a svirf community nearby. One might do careful exploring there, if the door to it is unlocked...
A dm might answer this better though.