I wanted to know if there is a tag that I can add to ftb ultimine to merge the tags with normal ores or modded ores

They don't if they would I could veinmine normal iron ore next to tuff iron ore yk?

I don't know much about FTB ultimine; however, the ores added by this mod should have all the same sorts of tags as normal modded ores

They have the same tags as normal iron ore. Whatever is preventing ultimine from working that way, it's not the lack of those tags. I don't know how ultimine works, so I couldn't tell you what it is.