Welcome to CDC Stacks | Multiple Seam Longwall Mining In The U.S.—Lessons For Ground Control - 9105 | National Institute for Occupational Safety and Health
Stacks Logo
Advanced Search
Select up to three search categories and corresponding keywords using the fields to the right. Refer to the Help section for more detailed instructions.
 
 
Help
Clear All Simple Search
Advanced Search
Multiple Seam Longwall Mining In The U.S.—Lessons For Ground Control
  • Published Date:
    0/1/1900
Filetype[PDF - 657.95 KB]


Details:
  • Personal Authors:
  • Description:
    Relatively few longwall mines in the U.S. operate under multiple seam conditions where the two seams are less than 200 ft apart. This paper describes the experience of six that do. These operations are located in PA, WV and UT, and include examples of both undermining and overmining. Some operate above or beneath their own workings, others are in historic mining districts and must contend with abandoned mines that are decades old. The lessons that these mines have learned cover a broad range of topics, including: • Whether to stack gateroads or place them under old gob areas; • How to size pillars and select artificial support to cross longwall stop lines; • How to use yield pillars to minimize multiple seam stresses and coal bump potential, and; • When to anticipate the creation of pathways for gas, water, or oxygen between current and abandoned gobs.

  • Supporting Files:
    No Additional Files
No Related Documents.
You May Also Like: