coal mining and its variability

CDC - NIOSH Numbered Publications: All Publications ...- coal mining and its variability , · The following is a complete list of all publications issued by NIOSH. To view publication numbers, click the "Show Publication Numbers" link at the top of the list.The design and construction of water impounding plugs in ...The design and construction of water impounding plugs in working mines Background. 1. The failure of any watertight plug at a working mine, or of the strata around it, …