Demo in video:
https://youtu.be/p_ytIJhMRqc
Minimum robot specs:
Computer Case (Tier 2)
CPU (Tier 1)
Memory (Tier 1.5)
EEPROM (LUA embedded)
Graphics Card (Tier 1)
Hard Disk Drive (Tier 1)
or
Disk Drive and (after assembly) Floppy Disk
which the HDD or FD has LUA and mine.lua program in it
Keyboard
Screen (Tier 1)
Inventory Upgrade
Geolyzer
Mining tool: Iron pickaxe
Program usage:
mine <facing> <depth>
When the robot can't dig down anymore, the robot will ignore the depth and go up.
Tips: When the robot is running, don't peek down. When the robot g