Strategic sill pillar design for reduced hanging wall overbreak in longhole mining
| Autor: | Hani S. Mitri, Tuo Chen |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Sill pillar design
0211 other engineering and technologies Energy Engineering and Power Technology 02 engineering and technology 010502 geochemistry & geophysics 01 natural sciences Longitudinal mining Mining engineering Sill Geochemistry and Petrology Unplanned ore dilution Retreat mining 021101 geological & geomatics engineering 0105 earth and related environmental sciences geography geography.geographical_feature_category Mining engineering. Metallurgy Pillar TN1-997 Underground mine design Limiting Geotechnical Engineering and Engineering Geology Lower half Numerical modelling Vein (geology) Geology |
| Zdroj: | International Journal of Mining Science and Technology, Vol 31, Iss 5, Pp 975-982 (2021) |
| ISSN: | 2095-2686 |
| Popis: | Steeply dipping, vein and tabular orebodies are traditionally extracted with longitudinal retreat mining methods such as Eureka and Avoca in a bottom-up sequence with delayed backfill. To increase productivity, sill pillars in the orebody are used to separate mining zones thus allowing production to take place simultaneously in two or more zones. While such mining methods are productive, they may be accompanied with high volumes of hanging wall overbreak causing significant unplanned ore dilution. In this work, it is shown through a mine design case study of a narrow vein deposit that a sill pillar could also play a significant role in limiting hanging wall overbreak. To demonstrate the role of sill pillar, a novel numerical modelling scheme is proposed to account for progressive stope wall overbreak. A numerical modelling approach of element death and rebirth is developed to allow for the detected stope overbreak to be immediately removed and replaced with backfill material before upper-level stope extraction. It is further shown that the average overbreak volume could be reduced by as much as 33% when the sill pillar is strategically placed in the lower half of a mine plan. |
| Databáze: | OpenAIRE |
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