Crown Pillar Optimization for Surface to Underground Mine Transition in Erzincan Bizmisen Iron Mine

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ARMA2016Conf.Paper-CrownPillarOptimizationforSurfacetoUndergroundMineTransitioninErzincanBizmisenIronMine.pdf

Date

2016-6-29

Author

Yardımcı, Ahmet Güneş
Karpuz, Celal

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Legal license boundary restrictions and economic considerations for extraction of vein type iron orebody in Erzincan/Bizmişen area of Turkey limit the overall production by open pit mining. Based on overall Stripping Ratio (OSR) assessments, ore production is decided to proceed by open pit mining to a certain depth and continue with a cut and fill type underground mining operation. A crown pillar is to be designed in the transition region from surface to underground operations. Crown pillar dimensioning effects the overall ore recovery in such small-scale ore bodies. Proper dimensioning has to ensure the stability of open pit mine slopes and underground mine structural units as underground mining progresses to upper levels. Dimensional optimization of the crown pillar is performed by empirical, deterministic and numerical modeling approaches. First, scaled span method was employed to estimate the safe crown pillar thickness providing the required service life. Later, rigid analysis method was used to check shear type failure from the abutments. Finally, 2D finite element modeling analysis was used to ascertain the stable crown pillar thickness. Input parameters of numerical models were produced from geotechnical site investigation work and laboratory experiments. Disturbance effect of surface mine production blasting on the slopes of rock mass above the underground workings was taken into account in deciding on the rock mass properties.

URI

https://hdl.handle.net/11511/74747

Conference Name

50th US Rock Mechanics / Geomechanics Symposium, ARMA 2016

Collections

Department of Mining Engineering, Conference / Seminar

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Citation Formats

A. G. Yardımcı and C. Karpuz, “Crown Pillar Optimization for Surface to Underground Mine Transition in Erzincan Bizmisen Iron Mine,” presented at the 50th US Rock Mechanics / Geomechanics Symposium, ARMA 2016, Houston/Texas, USA, 2016, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/74747.