User blog comment:Unownshipper/Metallurgists Wanted: Rapture's Natural Resources/@comment-24769282-20140810040047

In Bioshock: Rapture (Novel), it is mentioned that metals (not specified) were locally mined, hued corals were used for tabletops and counters, glass was made from the deep-sea sand and metals and other elements were scrapped from sunken ships, boats and planes.

It is also said within the novel that Ryan had purchased warehouses filled with furniture, hardware supplies and construction supplies, and stored them to whoever or whichever business decided to buy it for themselves before cutting off contact with the surface world.