Foundry Services
The initial foundry will be on the moon. The first foundry is were the raw materials from the moon will be converted into the materials for space station construction. Some of the byproducts which will be produced from the foundries includes oxygen and other gases. These gases will be collected and used, or sold.
Addtional foundries can be built on the moon, in orbit around the moon, or at the space station. Eventually asteroids, could be harvested for their resources, as well.