Summary

Mines provide a way for Bubbs to harvest gold.

Despite being natural transmuters, Bubbs are unable to naturally create gold from energy which makes it especially valuable to Bubbs as a currency.

Tactics

Gold Mines do not deplete, and are the only source of Gold early game so be sure to secure as many as possible.

Trivia

While there is technically a finite limit for each building, this is especially true for Mines, being limited to a Gold node.