Shafts are player-created tunnels that dig deep into the Mine. They can range from different lengths, and can go deep into other layers. Due to most people following straight through the Shafts, rare ores can spawn and can be quite common. A shaft that began in the Dirt Layer. Amethyst that had spawned in a Shaft. Retrieved from "http://the-quarry.wikia.com/wiki/Shafts?oldid=154"