I built this little mine over a year ago, it's an open air mine with a bunch of crane lifting out the cobblestone residue from the pit.
The name "Fecau" comes from the elements that are found there: iron (Fe), coal (contains a high C value) and gold (Au) precious gold!!
The main purpose here was to give parts of the world a more "populated" scent to it.
It includes:
-Elaborate mines (custom made, not the regular game ones)
- A rollercoaster!!!
-A shop (for pickaxes)
-Furnaces
-Loot and rewards!! (at the end of the railway and some parcour)
-A storage facility
-A place to dock your boat and unload it

This project is part of the Terra Lacus adventure map!

I put it under Minecart but it could have been underground or land structure just as well.