Located in the shop you can purchase these books to upgrade your mine
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
Grinder: Destroys a lesser amount of ore from the rocks dumped into it
Sifting table: You lose fewer ore/gemstones through the table
Power grid: Improves the efficiency of the power gems you use for the wash plant, making everything run just a bit longer.