Take context from the input text and decide on the accurate relationship between 'Mozal' and 'Maputo' from the options provided.
Options: headquarters location, distribution format, chief executive officer, platform

The BHP Billiton Mozal smelter, for example, consumes two-thirds of the electricity generated in Mozambique but employs only 1,070 people at its plant in Maputo and 3,500 downstream, with jobs ranging from catering to sewing uniforms, according to its own figures.
headquarters location