The coal seams are located between the town-site and towards the mountain of Zeppelinfjellet. The coalfields are about wide in the east-west orientation, and about wide in the north-south direction. There are six seams, located at a ten to twenty degree angle towards the surface. The seam thickness varies from a few centimeters (about an inch) to . The varying thickness increased the complexity of mining. From the top the seams are named Ragnhil, Josefine, Otelie, Advokat, Sofie and Ester. Most of the latter three are located below sea level. Each shaft was named for the seam it connected to. The area has further been subdivided into areas: Eastern, Agnes, Eastern Center, Western Center, Western and Lagoon. Only three have seen production, the Agnes, Eastern Center and Western Center.