The Chicago Tunnel Company built a 2 ft (610 mm) narrow gauge railway freight tunnel network under the downtown of the city of Chicago. This was regulated by the Interstate Commerce Commission as an interurban even though it operated entirely under central Chicago, did not carry passengers, and was entirely underground.
A. Abutment - In coal mining, (1) the weight of the rocks above a narrow roadway is transferred to the solid coal along the sides, which act as abutments of the arch of strata spanning the roadway; and (2) the weight of the rocks over a longwall face is transferred to the front abutment, that is, the solid coal ahead of the face and the back abutment, that is, the settled packs behind the face.
Run-of-mine (ROM) coal. The coal delivered from the mine that reports to the coal preparation plant is called run-of-mine, or ROM, coal. This is the raw material for the CPP, and consists of coal, rocks, middlings, minerals and contamination.
Abutment — In coal mining, (1) the weight of the rocks above a narrow roadway is transferred to the solid coal along the sides, which act as abutments of the arch of strata spanning the roadway; and (2) the weight of the rocks over a longwall face is transferred to the front abutment, that is, the solid coal ahead of the face and the back abutment, that is, the settled packs behind the face.
Cradley is less famous for coal mining than chain making, but between 1850 and 1950 the collieries were no less important than the chain works in the local economy and for the legacy they left.
Coal mining - Choosing a mining method: The various methods of mining a coal seam can be classified under two headings, surface mining and underground mining. Surface and underground coal mining are broad activities that incorporate numerous variations in equipment and methods, and the choice of which method to use in extracting a coal seam depends on many technological, economic, and social ...
2005-2013 . Last updated on July 01, 2015 This site is dedicated to all the men and women having worked on the Niagara Tunnel Project . A special THANK YOU is extended to the following companies and persons
Hoosac Tunnel: Abode of the Damned? An Exploration of the "Bloody Pit" Article & Pictures . Site Visit: October 14, 2002 by Daniel V. Boudillion & Andrew T. Bowers
Lifting And Rigging. Hi-Sea Marine Lifting and Rigging include Steel Wire Rope, Hooks, Shackles, Thimbles, Turnbuckles, Pulley and Blocks, Wire Rope Grip Clips, Lifting Tie, Grapnel Hook, Wire Rope Sockets and etc.
Glossary. Some mining terms and their meanings, please note that some terms varied from colliery to colliery even within the same area. Headings in Red are click-able for popup images.
KAMY series of Roadheaders offers the best cutting performance in a wide range of rock formations. Equipped with geometrically optimized transverse or longitudinal cutter heads, these flexible machines can be used to excavate subway tunnels, road tunnels, railway tunnels and water tunnels without using explosives.