UnEarthed's iron ore variants cannot be ground in such machines as Tech Reborn's grinder, Astromine's triturator or Applied Energistics 2's quartz grindstone into each mod's respective iron dust because they are not added to the c:iron_ores tag.

I just now realized that the iron ore item, the little brown blob, can be ground, and that UnEarthed thus is compatible with tech mods. Eh, you can still merge the PR for completeness of recipes' sake if you wish.