Refinery

The refinery is a factory outside of the cave which players can upgrade to increase the value of their ores. Refineries are assigned automatically when you claim a tycoon.

Cleaner
The ore cleaner adds its upgrade level to the value of any passing ores, starting with +1 when the machine is first bought and ending with +7 when all available upgrades are bought.

Purifier
In contrast to the cleaner, the ore purifier multiplies its upgrade level to the value of any passing ores, starting with x2 when the machine is first bought and ending with x6 when all available upgrades are bought.