Extraction of gold-bearing ore from under the open pit bottom at the Makmal deposit by room-and-pillar mining with backfill made of production waste

Tapsiev, A. P.; Freidin, A. M.; Filippov, P. A.; Неверов, А. А.; Неверов, С. А.; Artemenko, Yu. V.; Uskov, V. A.; Ufatova, Z.G.

doi:10.1134/s1062739147030099

Cited by 5 publications

(1 citation statement)

References 3 publications

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“…The backfilling technique has attracted extensive attention in the mining industry considering its advantages in controlling surface subsidence, decreasing rockburst risks, reducing gangue discharge, and protecting the localized hydrogeological environment (Chang et al, 2014;Edraki et al, 2014;Howladar and Karim, 2015;Jixiong Zhang et al, 2016;Hefni et al, 2021). The preliminary research mainly focused on developing backfilling materials and methods (Tapsiev et al, 2011;Seryakov, 2014;Deng et al, 2021). Mitchell et al assessed the strength of filling materials regarding cemented classified tailings and sand using physical simulation (Mitchell et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

A New Repeated Mining Method With Preexisting Damage Zones Filled for Ultra-Thick Coal Seam Extraction – Case Study

et al. 2022

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Arbitrary mining activities done by previous small-scale mines left many irregular damage zones in the ultra-thick coal seam, consequently leading to serious roof caving disasters and recovery ratio decline during repeated mining. Pre-filling the damage zones is an effective method to prevent mining-induced geological disasters. In this study, a novel method regarding damage zone filling–based repeated mining (FBRM) was proposed by combining the lower cutting layer (LCL) with the upper key bearing layer (UKBL) based on analyzing the disaster state when the workface passes through damage zones. To determine filling thickness, a method for calculating UKBL thickness was developed to preliminarily identify the filling thickness parameters of UKBL. On this basis, a numerical model incorporating damage zones and coal extractions was established to investigate the impact of UKBL thickness on fracture propagation and the maximum principal stress profiles around the damage zones. The proposed FBRM method was verified using the ground pressure data collected from Panel B909 of Pingshuo No.2 Colliery. The results show that 1) filling material with low strength and good cuttability is suitable for LCL, while material with high strength and robust bearing capacity is suitable for UKBL; 2) with increasing the UKBL filling thickness, the height of fracturing decreases, obeying a negative exponential function, suggesting a good effectiveness of the damage zone pre-filling technique; 3) as the UKBL filling thickness rises to 5 m, the maximum principal stress relocates from the area above both damage zones to the area closely in front of the workface, indicating a filling thickness threshold of 5 m that can ensure roof stability; 4) the maximum working resistance and bed separation were 11,800 kN and 26 mm, respectively, when the workface passed through damage zones B and E, favoring a good reliability of the FBRM method. The research can provide best-practice references for preventing roof caving disasters while exploiting the ultra-thick coal deposits affected by previous mining activities.

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Section: Introductionmentioning

confidence: 99%

A New Repeated Mining Method With Preexisting Damage Zones Filled for Ultra-Thick Coal Seam Extraction – Case Study

et al. 2022

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Extraction of ore reserves from undermined protective pillar under open pit bottom

Конурин

Shchukin

Неверов

2020

IOP Conf. Ser.: Earth Environ. Sci.

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One of the problems in ore mining is untimely preparation of ore reserves for extraction. Eventually, mining efficiency drops. Aiming to replenish quickly depleting reserves, mining of various-purpose pillars is undertaken. For this reason, studies into safe mining of pillars are relevant and essential. For instance, for a gold mine in ground conditions of pronounced geological and structural uncertainty, for the sustained short- and-medium-term production, a method was validated and proposed for extraction of ore reserves from the undermined crown pillar left under the open pit bottom. In the framework of this research, a geomechanical model of an ore deposit has been developed in the form of a conceptual flow chart of mining of a crown pillar under an open pit bottom at the preserved production infrastructure condition by surface and underground mining. 3D numerical modeling uses the finite element method. The calculations find that underground mining of the undermined protective pillar under the open pit bottom, due to considerable jointing of the steeply dipping ore body, is limited by expansion of wide possible rock damaged zones up to the ground surface.

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Resource-saving geotechnologies for thick gently dipping complex ore deposits in the Norilsk region

et al. 2014

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Extraction of gold-bearing ore from under the open pit bottom at the Makmal deposit by room-and-pillar mining with backfill made of production waste

Cited by 5 publications

References 3 publications

A New Repeated Mining Method With Preexisting Damage Zones Filled for Ultra-Thick Coal Seam Extraction – Case Study

A New Repeated Mining Method With Preexisting Damage Zones Filled for Ultra-Thick Coal Seam Extraction – Case Study

Extraction of ore reserves from undermined protective pillar under open pit bottom

Resource-saving geotechnologies for thick gently dipping complex ore deposits in the Norilsk region

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