Refining

Refining is the industrial process that upgrades a raw commodity, such as crude oil or mined metal, into a purer or more usable product like gasoline or refined copper.

Refining takes a raw commodity that is not yet usable in its extracted form and processes it into something a manufacturer or consumer can actually use. Crude oil is refined into gasoline, diesel, and other fuels through distillation and further chemical processing; mined metal, after smelting removes it from ore, is refined further to remove remaining impurities and reach the purity a market demands.

Where refining happens does not always match where the raw material was produced. Crude oil is often refined far from the oil field, and metal concentrate is regularly shipped to another country’s smelters and refineries entirely. This gap is why trade statistics distinguish mined or extracted volumes from refined output, and why a country can be a large exporter of a raw commodity while importing back the refined product made from it. See producing vs exporting vs processing.