Ghosh, A.K. and Prasad, Shankar and Ghosh, C.N. (1993) Stability analysis of cemented backfill column in VRM stopes during tertiary extraction of stope-pillars in Rajpura Dariba Mine. Journal of Mining Research , 2 (2). pp. 1-14. ISSN 0971-1899

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At Rajpura Dariba Lead-Zinc Mine in Udaipur district of Rajashtan (India), the multi-lens deposit is steeply dipping with dip around 65 to 70°. Orebody and wall rock are competent. Heare, Vertical Retreat Mining (VRM) method is practice below 300 MRL. The orebody between 289 and 212 MRLs is being mined by stope-pillar method. Primary and secondary stopes of 15 to 20 m strike length are being transversely mined by VRM, leafing alternate stope-pillars of similar strike length. After secondary mining, the mineable reserve between these two levels remain locked-up in the form of stope-pillars. The mined out primary and secondary stopes are post-filled with cemented mill tailings. During tertiary mining, the stope-pillars would be extracted by VRM method. The backfill inside and extracted VRM stope form an inclined column, vertically 70 m long, and around 15 x 20 m in cross-section. Initially the fill column in an extracted stope remain enclosed on all four sides by exposed hangwall, footwall and stope-pillars. But, during tertiary extraction, when these stope-pillars are mined, these fill column loose their support on two opposites sides, either simultaneously or one by one-depending on the extraction sequence. Thus, the exposed faces of fill columns require to stand of their own during mining of their adjacent stope-pillars. This paper presents the findings of the studies conducted to evaluate the stability of fill columns under static loading in already mined VRM stopes, using different analytical approaches. In the process, applicability of these approaches in this problem was also evaluated. Accordingly, necessary modifications in the mining strategy of VRM stoping with stope-pillar method was designed for this mine.

Item Type: Article
Subjects: Mines Systems Engineering
Depositing User: Dr. Satyendra Kumar Singh
Date Deposited: 24 Jan 2012 05:32
Last Modified: 24 Jan 2012 05:32

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