The front of the equipment has a series of tungsten steel augur bits about 10 feet wide that dig into the coal and rock creating a “tunnel” approximately 10 feet wide and anywhere from 31″ to 54″ tall depending on the height of the coal seam (the seam we were in averaged about 44″ high).
What is the average height of a coal mine?
average coal seam height according to the following cate- gories: low (<42″), medium (43″-60″), and high (≥61″). Injury rates for both nonfatal days lost and fatality cases were examined by seam height and leading type of injury incidents.
How deep is the deepest mine in the world in feet?
This list of deepest mines includes operational and non-operational mines that are at least 2,212 m (7,257 ft), which is the depth of Veryovkina Cave, the deepest known natural cave in the world.
Which is the largest mine tunnel in the world?
Part of state-run Codelco, 55 kilometers east of Rancagua, El Teniente is the world’s largest underground mine. Its more than 2,400 kilometers of tunnels yield more than 400,000 metric tons of refined copper per year.
How deep is the deepest underground mine?
The Mponeng (‘look at me’ in Sotho) Gold Mine, which has been in commission since 1986, is located southwest of Johannesburg, South Africa. Mponeng currently holds records as the world’s deepest gold mine and the world’s deepest mine, with depths reaching over 4.0 km below the surface.
