Located in the shop you can purchase these books to upgrade your mine
Mine Upgrades[ | ]
Mine Cart: Increases the amount of raw rocks you get
Belt: Increases the speed of all the wash plant parts
Elevator: Spits out fewer rocks when carrying up to the grinder
Grinders: Destroys a lesser amount of ore from the rocks dumped into it
Sifting Table (Grating): Lose fewer ore/gemstones through the table
Power Grid (Panel): Improves the efficiency of the power gems you use for the wash plant, making everything run just a bit longer - also upgrades the ore selection lever, to allow the player to choose which ore is processed by the wash plant.