I just finished a 5:18 run for All Overworld Ores - No Emerald which would place me 3rd. However I stumbled on emeralds before I found the diamond and so I technically also qualify for All Overworld Ores. But in that category I would place 4th. I technically meet the requirements for both categories so am I allowed to submit to both?

Nope just the first one because you need to have all of the ores in your inventory in the end of the run

Sorry for not being clear, but I did mine them all. At the end of the run I had all the ores, including emeralds, in my inventory.

I'd think that it would count for both.

It counts for both

i think you can only submit it once because there has to be an end to run sorry:(

It counts for both, just submit the run with the timestamp of the end of the run. I'm a former mod so you can trust me :)