For example all copper ingots are forge:ingots/copper.
So they should be forge:ingots/uraninite.
You could also use gems or dusts instead of ingots.

From the modpack issue i linked the developer of that modpack has stated that the block form of the ores do actually have a forge:ores tag, but that the item forms of the ore blocks do not. As a correction to my above comment in light of this:

Could also add a tag to the item form of the ore blocks

Could also do this for the uraninite ores