Since Da Man is becoming more active again, I've decided to to post my massive idea for mining. Here goes.

First off, mining in this way would have spaces in your estate just like farming and crafting. Caves would be spaces similar to the crafting and farming spaces. Each space can hold one of your pokemon. Each space would pull up a list to send your pokemon to a cave. These caves would range from copper all the way to ancient.

Your pokemon would need a certain level to enter each cave starting at level 5 for copper. Each time the pokemon comes back from the cave, it would have a chance to bring back 1-5 pieces of ore from that cave. Each piece of ore would give it's amount of exp.

Example: You send a level 5 metagross to the copper cave and it brings back 3 ore. Those 3 ore give 1 exp each. That would give you 3 total exp.

Examples of caves:
Copper Cave - Requires level 5 pokemon and level 1 mining
Iron Cave - Requires level 25 pokemon and level 5 mining
Steel Cave - Requires level 125 pokemon and level 20 mining
Silver Cave - Requires level 625 pokemon and level 40 mining
Gold Cave - Requires level 3125 pokemon and level 70 mining
Ancient Cave - Requires level 15625 pokemon and level 100 mining (random chance to get ancient fossil 2, which gives third gen ancients)

If anyone has anything to add, feel free to comment. I hope you all like this idea.