I'm not going to create a resourcepack. I just need to replace a resourcepack's stone to the vanilla stone, because of modded ores display not correctly.
(Yes, I tried to find them in the assets folder)
Ah, see, that's a different question entirely. You should have just said so!
Just find the base stone texture in the resource pack (assets/minecraft/textures/blocks/stone.png) and delete it. Ditto for the vanilla ores. Minecraft replaces any 'holes' in the resource pack with vanilla assets automatically, so there's no reason to bother transferring things if you want to end up with the default anyway.