Study of the effect of web variation on the performance of a longwall face. Final technical report, 30 November 1979

Technical Report · Fri Nov 30 04:00:00 EST 1979

DOI:https://doi.org/10.2172/5291285· OSTI ID:5291285

Guay, P. J.; Hawkes, T. M.

This report presents the benefits that can be derived from mining deeper webs (cuts) on a retreat longwall as practiced in the United States. The study looks at the increases in productivity (tons per shift and per annum) and the cost benefits (reduced cost per ton off the face) for a double ended ranging drum (DERD) shearer operating in the half face or modified half face mode. The gains in productivity and the cost benefits are established for web depths varying from 27 to 57 in. in a 6.5 ft seam height. The impact of wide webs on face equipment is evaluated including all currently used types of roof supports, and sizes of shearing machines. Additionally, the expected effect of wider webs on health and safety is discussed, as well as the experience that the British Mining Industry has had mining one meter (39 in.) webs. Finally, the most cost effective system of equipment is identified and specified along with the overall impact of its use on conditions of mining.

• Research Organization: Foster-Miller Associates, Inc., Waltham, MA (USA)
• OSTI ID: 5291285
• Report Number(s): FE-9058-1(Vol.1)
• Country of Publication: United States
• Language: English

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