Koidu-Sefadu is the second largest city in Sierra Leone, lying in the east of the nation. Its name is often shortened to Koidu or Sefadu, and it is also known as Kono or New Sembehun. It is a major centre for diamond panning. The mineral diamond is a crystalline form, or allotrope, of carbon (other allotropes of carbon include graphite and fullerene). ... Panning, a horizontal motion in an image display or capture. ...

Devastated by the wars in Sierra Leone, the town was heavily looted and constantly fought over due to the rich diamond reserves in the area. During the peace process, it has rapidly become little more than one massive diamond mine. [1] (http://news.bbc.co.uk/1/hi/world/africa/1484843.stm)

American aid workers helped rebuild the Koidu Government hospital, which has improved the previously alarming health situation in the town. Various other aid workers have helped drill wells in the area, which also greatly improved the health situation.