Coal Miningdocx Coal Mining 001 Strata Meansbeds
COAL MINING 001 Strata means beds or layers, beams or bars, coal seams, surrounding rocks. BEDS OR LAYERS COAL MINING 002 Goaf means in-situ rock, caved roof materials, coal refuse, powdered coal. CAVED ROOF MATERIALS COAL MINING 003 Where the microenvironment is located in a longwall operation. at the face, at the roof, at the floor, in the entire panel.