I don't know of any x-ray mods for PE, only texture packs. So @Sandertv's should almost definitely work. That is most certainly %100 off-topic.
i opt for actually sending fake/masking ore blocks i feel like using texture packs is as if i used a javascript+overlayed image to protect my admin webpage, generally hacky i dont really know how but i think there's something related to when a chunk is sended you replace it fakely as blocks in the packet tho that means you need to try to reveal any ore blocks once something is mined
A simple way is not to generate any ores and only update them when their adjacent block is updated. Just modify the generator.
I have a found this plugin, it is very old and it needs to be updated. https://github.com/fengberd/FHiddenMine