The newbies could be given access to a 'managed' mine, where we let people dig freely in certain areas (keeping resources), but we turn the mine into an underground chamber.
Tefals Dwarf fortress is an excellent example of what we could do with a community mine.
Sign posts on the door to the mine explaining the dig requirements.
- Dig chamber one is currently active (dig here within 30 blocks of position X only)
- Dig chamber two is now completed (so closed for mining)
- Dig chamber three is currently active (dig here for 60 blocks from position X and 30 from position Y)
Collaborative work, only works when everyone has a vested interest (i.e something to gain) and getting resources is a pretty simple way to encourage access, we can easily manage access with signs to, it just requires a plan.
Once completed or if determined a failure then I would be happy to turn it into a real build.