AbstractsEarth & Environmental Science

"The mines surveyed and included in this thesis are certain mines in the foremost and second largest producing counties in the state, namely Macon and Adair county. This thesis also includes surveying at one mine in Randolph County ... The mines included in this thesis operate mainly in the Bevier bed. This seam contains an average of 41 inches of coal in Adair County and is somewhat thicker in Macon and Randolph County. All mines in the Bevier bed are operated on the room and pillar system of mining with about 50 to 60 percent extraction in Adair County and a somewhat greater extraction in Macon County. A few mines included in this thesis operate in the Mulky bed. This seam is from 20 to 24 inches thick and is operated on the longwall system with a face track and skip roadways off of the main entry" – Introduction, Pages 5-6.