Community Research and Development Information Service - CORDIS


The company Hullera Vasco Leonesa (HVL) is trying to improve the results of its exploitations by means of soutirage (sublevel caving), looking for maximum vertical concentration of the product. The limitation of the present systems necessitates the use of other methods of breaking the coal block. For this reason, a trial of the high pressure compressed air blasting (DACAP) technique would appear to be appropriate. This offers the outstanding advantage of increasing the height of the coal obtained by soutirage. HVL has divided the investigation into two stages. Firstly, to study the feasibility study recommended the use of the Competidora method, using the DACAP technique for the soutirage, duplicating the distance between sublevels. The foreseen improvements are a cost reduction of 17% and an output increase of almost 9%. The trial stage of this operation started in the first six months of 1992 and results were established in relation to: working variables optimization, improvements in production and productivity, a better percentage of coal recovery and cost reductions. This document summarizes the work done and the results obtained from the project.

Additional information

Authors: HULLERA VASCO-LEONESA, Hullera Vasco-Leonesa SA, Santa Lucia de Gordón (ES);SA, Hullera Vasco-Leonesa SA, Santa Lucia de Gordón (ES)
Bibliographic Reference: EUR 17174 ES (1997) 178pp., FS, ECU 30
Availability: Available from the (2)
ISBN: ISBN 92-827-9879-8
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