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Demonstration of Longwall Mining in a Steeply Dipping Coal Seam.
NTIS: PB 88-192975 :82 pages
This report describes the demonstration of longwall mining in a seam dipping 27 degrees to 34 degrees. Equipment was selected on the basis of capability, compatibility, and cost. The longwall equipment operated very well on the steep pitch with an average equipment downtime of 21.9%. Coal handling outby the face was a problem that caused an additional downtime of 19.5%. Development for the panels proved to be the major problem in the economics of longwall mining on a steeply dipping seam. During the first 9 months of operation, the longwall averaged 71.9 Tons per worker- shift (tpws) and development averaged 0.6 Tpws, for an overall average of 14.1 Tpws. Had mining continued, timing of development would have been another major problem. Monitoring of subsidence, pillar stability, and shield loading was done in connection wth mining, but little useful information was gained from the monitoring.
CP; Final Contract Report;
NTIS Accession No.
NTIS: PB 88-192975
Snowmass Coal Company
Page last reviewed: September 2, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division