ABSTRACT
Ground Support in Mining and Underground Construction-Villaescusa & Potvin (eds.) © 2004 Taylor & Francis Group, London, ISBN 90 5809 640 8
ABSTRACT: When developing a new mine, development of the ore pass system is a major capital expense. To prolong the life of the ore pass system the mine needs to ensure that these ore passes are adequately protected when subjected to high stresses and adverse geological conditions. Various methods of attempting to prolong the life of these ore passes have been tried in the South African Mining industry with varying degrees of success. The most common method of lining ore passes today is by means of cementitious linings. Before developing an ore pass system the following need thorough investigation. The location of the ore pass, type of ore pass system to be used and the type of rock reinforcement to be used. The choice of the correct concrete as a lining material is critical (cement type and aggregate) to the durability of the lining. Laboratory results must be evaluated and compared to practical experience gained from actual installations when available. The method of application must be evaluated comparing the advantages and disadvantages of each method. Detailed cost evaluation of the various options must be done. Once this investigation has been completed the mine needs to carefully evaluate all the options available taking into account the cost to rehabilitate the ore pass if the ore pass system fails. Only once all these steps have been completed the mine should decide on which option to follow.
