Mechanical excavation systems (in three parts) 1. Drill-split narrow-vein and longwall mining.
Lombardi JA; Jude CV
Denver, CO: U.S. Department of the Interior, Bureau of Mines, IC 9392, 1994 Jan; :1-21
In this U.S. Bureau of Mines report, two drill-split mechanical excavation mining system concepts are described, costed, and cost compared with conventional drill-blast mining systems. The concepts for the two drill-split mechanical excavation mining systems presented are (1) a method for steeply dipping narrow veins 0.6 to 1.2 m wide and (2) a longwall method for flat-lying tabular ores. In the proposed systems, 70 to 80 pct of the ore is disposed of underground as backfill. For sortable ores, face area crushing, sorting, and direct stowage of run-of-mine waste and low-grade ores are proposed. The underground sorting and stowing of waste reduce materials handling, processing, and waste disposal costs by reducing the quality of ore transported to the surface by 70 to 80 pct (by volume).
Backfills; Blasting; Mining-equipment; Tunneling-machines; Coal-seams; Longwall-mining; Excavation-equipment; Mineral-industries
NTIS Accession No.
Denver, CO: U.S. Department of the Interior, Bureau of Mines, IC 9392