Adds underground mines, randomly extracting ores in bulk. (warning loaders required at higher tiers).
version 2.0.01: fixed a typo preventing deepminer mk2 from being craftable.
Happy to do any balance changes/add new integrations, my next planned changes will involve B&A as im about to do a small run using my deepmine so B&A issues will be getting resolved during the next week or so.
