This is a project that I'm actually proud of. It's entirely made in Kotlin, and isn't very messy.
It's a core plugin for a Skymining server. Some features:
Configurable mines
Autocompressors
Teleport scrolls
Compressed items
Autoreset for the mines
Reset command for the mines
A command blocker
There are some slight bugs that I know about, but I haven't gotten around to fixing them yet.