coal seam with greater inclination angle
Deeply Inclined Coal Seam
fat coal with high sulfur content
shallow coal seam with thin bedrock
sharply inclined coal seam
Steeply Inclined Coal Seam
top coal seam with parting band
deep inclined seam with potential outburst
deeply inclined angle seam
abnormal coal seam thickness
accumulated total coal seam thickness
allochthonous coal seam
artificial coal seam roof