Jan 23, 2012 Once ore is extracted, processing it into pure gold must be done. Ore is first crushed and then undergoes various processes depending on the nature of associated minerals. Processing low-grade ore is relatively simple while higher grades require extensive processing. Step 8 – Refining (off-site) Once basic processing is done, the ore is.Used Gold Ore Milling Plant For Sale. 911MPE has small gold mining equipment for sale and specifically mineral processing equipment.Our equipment is best used in small scale extractive metallurgy operations operated by small miners or hobbyist prospectors and mining fanatics. 911MPE offers gold mining equipment as well as processing equipment applicable to most any base metals.