40 CFR § 98.200
Definition of source category
June 9, 2020
The magnesium production and processing source category consists of the following processes:
(a) Any process in which magnesium metal is produced through smelting (including electrolytic smelting), refining, or remelting operations.
(b) Any process in which molten magnesium is used in alloying, casting, drawing, extruding, forming, or rolling operations.