Churn Drill

Churn Drill is a form of Technology and Culture.

Description
Deep holes can be bored by placing a bit made of a heavy wooden log with a sharpened tip on one end into the ground, and then repeatedly raising and dropping a heavy weight onto the other end. Larger shafts can be bored using teams of oxen to rotate the bit, while water is poured into the bore hole to wash out the crushed rock.

Effects

 * Enables construction of: Copper Mine, Gold Mine, Jade Quarry