Results 1 - 2 of 2

• Economics of Safety at Surface Mine Spoil Piles
  7/1/2000 - Reports of Investigations
  Short-dumping rather than edge-dumping might reduce dumping-related accidents, but many operators believe it is less cost effective. To evaluate this perception, NIOSH reviewed the costs of various dumping methods at waste and spoil piles.
• Drilling a Horizontal Coalbed Methane Drainage System from a Directional Surface Borehole
  1/1/1982 - Reports of Investigations
  Three long horizontal holes were drilled from a directionally drilled surface hole at the Emerald Mine near Waynesburg, Pennsylvania. The purpose was to adapt the technique of directional drilling for use in draining methane from coalbeds.