An abandoned ore processor on Deep Space 9 being inspected by Miles O'Brien and Jake Sisko. (DS9: "Civil Defense")
Ore processing is a procedure in which raw minerals are extracted and processed into useful components.
The Cardassian mining station Terok Nor was used to process raw uridium ore from Bajor during their Occupation. Using Bajoran slave labor, the station was able to process up to 20,000 tons of ore a day. Since the Cardassians left Bajor and Terok Nor in 2369, the ore processing facilities have remained unused. (DS9: "Civil Defense")
Li Nalas once worked in the ore processing plants on Terok Nor. (DS9: "The Homecoming")
In the mirror universe, Odo was in charge of the ore processing sections on Terok Nor until he was killed by Julian Bashir in 2370. (DS9: "Crossover", "Shattered Mirror")