![Technology / Longwall mining / Retreat mining / Room and pillar / Gob / Coal mine bump / Mine Safety and Health Administration / Underground mining / Mining / Coal mining Technology / Longwall mining / Retreat mining / Room and pillar / Gob / Coal mine bump / Mine Safety and Health Administration / Underground mining / Mining / Coal mining](https://www.pdfsearch.io/img/5fec1e34b5d463ea7825fbf25c2a9d2e.jpg)
| Document Date: 2014-07-18 14:46:10 Open Document File Size: 61,98 KBShare Result on Facebook
Company Deep Cover Coal Mines Coal / / Country United States / / Event Layoffs / / Facility Mine Planning/Pillar Design / Retreat Mining / Retreat Mining Pillar Stability / / IndustryTerm numerical modeling software / retreat mining operations / particular software / retreat mining plan / longwall face equipment / pillar retreat mining / mining / metal guarding / protective equipment / nearby mining operations / retreat mining activity / longwall mining / retreat mining / room-and-pillar retreat mining operations / prevention of pillar failure / / Organization U.S. Department of Labor Mine Safety and Health Administration / / Person Richard Stickler / / Position Acting Assistant Secretary / / URL www.msha.gov / /
SocialTag |