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Active's lineboring staff are master craftsmen, skilled in fitting and turning, welding, tool making and mechanical problem-solving. Our work includes hole building and boring (up to 16 per day), fabrication, crack repairs, rebuilds, joint and pivot repairs and maintenance.
Glossary of Mining Terms rocksandminerals. Abutment In coal mining, (1) the weight of the rocks above a narrow roadway is transferred to the solid coal along the sides, which act as abutments of the arch of strata spanning the roadway; and (2) the weight of the rocks over a longwall face is transferred to the front abutment, that is, the solid ...