Investigation into crown stability at underground leaching of uranium ores

Stupnik, Mykola; Kalinichenko, V. I.; Fedko, Mykhailo; Kalinichenko, Olena

doi:10.29202/nvngu/2018-6/5

Cited by 14 publications

(37 citation statements)

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“…where Р rock , Р cr are loads caused by overlying rocks the FC respectively, t; S max is the area of the cross section which the FC rests on, m 2 . On solving (16) with regard to S max, we obtain the formula for determining minimal permissible areas of the "support" pillar that bears the FC гр P sin cos tg S c…”

Section: Resultsmentioning

confidence: 99%

“…Underground mining operations have reached the depth of 1350 m. Ore bodies stretch for 800-1200 m, their horizontal thickness is 30-120 m and the angle of slope is 45-85 degrees [13][14][15][16]. The authors of [17][18][19][20] state that ore bodies significantly differ from each other in not only physical and mechanical properties that influence mining and processing technologies but also their quality.…”

Section: Introductionmentioning

confidence: 99%

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Enhancement of the technology of mining steep ore bodies applying the “floating” crown

et al. 2021

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When mining ore bodies in Kryvyi Rih iron ore basin, underground mines apply open stoping or bulk caving systems in proportion of 55% to 45%. Most of underground mines prefer stoping with pillar caving. Yet, rock pressure contributes to growth of costs for workings maintenance and deterioration of extraction indices. Rock mass extraction indices can be enhanced by application of a protectve structure in the upper part of the block that will enable additional decrease in load on the draw level. There are a great many of methods for determining parameters of constructive elements of the protective structure that help keep its integrity for the whole period of block mining. The article suggests methods for determining parameters of the protective structure when mining steep ore bodies. The research conducted demonstrates that with the inclined protective structure, increase of unit load on it from 200 to 1200t/m2 leads to decrease of its thickness from 6.3-20.9m to 5.5-18.4m and increase of the crown length from 40m to 60m. The developed block caving system with application of the protective structure when mining steep ore bodies enables overall decrease of ore dilution in the block by 3%, increase of iron content in the mined ore by 1.3% without significant mining costs growth and decrease of loads on the workings of the receiving level.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Enhancement of the technology of mining steep ore bodies applying the “floating” crown

et al. 2021

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“…Experience shows that in most cases it is most efficient from the engineering and organizational points of view to drive horizontal and inclined transport transportation workings from the open pit side [47][48][49]. When determining the parameters of OT and OUT, the methods used for OPMO are applied [2][3][4] and technological features of determining parameters of mining operations in combined mining are also considered [53][54][55].…”

Section: Analysis Of Researches and Publicationsmentioning

confidence: 99%

Iron ore underground mining under the internal overburden dump at the PJSC “Northern GZK”

Pysmennyi

Chukharev²,

Kyelgyenbai³

et al. 2022

IOP Conf. Ser.: Earth Environ. Sci.

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Deterioration of mining conditions at mining deposits by open pit methods (increased mining depths, reduced ore deposit thickness) leads to an increase in mining costs. In Ukraine, to reduce open pit mining costs, overburden is disposed in temporary internal dumps located directly in the open pit over the ore reserves. Reactivation of pit areas with the temporary internal overburden dump located on them results in a surge of mining operations and deterioration of technical and economic indicators. Increased energy consumption, a decrease in working site parameters, an increase in angles of open pit slopes and stripping lags lead to unprofitability of open pit mining. One of the solutions to the mentioned scientific and engineering problem involves combined mining of deposits by integrated open pit and underground mining operations. The combined open pit-underground mining method enables reducing mining costs and enhancing technical and economic indicators. The suggested schemes for opening reserves located under the internal overburden dump enhance technical and economic indicators of deposit mining through making the internal dump a permanent one. This allows further disposal of overburden into internal dumps. Implementation of scientific recommendations and technological solutions resulted from the research performed (exemplified by the deposit Hannivske, Ukraine) reduces the cost of ore by 1.33 USD/t. At the same time, the total cost of building an underground mine makes 16.4 M USD, which is 30% less than when applying traditional opening vertical shaft schemes.

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“…Significant changes in the stress-strain state of the mass, depending on physical and mechanical properties of rocks, are proved in [26]- [30]. The study of the impact of physical and mechanical properties of rocks on the geometrical dimensions of rooms and the mining technology tailored for the conditions of the "SkhidGZK" underground mines are presented in [31]- [34]. The works [35]- [38] deal with the impact of the mass stress-strain state on the stability of mine workings and parameters of mining operations.…”

Section: Research and Publications Analysismentioning

confidence: 99%

Methodology enhancement for determining parameters of room systems when mining uranium ore in the SE “SkhidGZK” underground mines, Ukraine

Stupnik¹,

Kalinichenko²,

Fedko³

et al. 2022

Min. miner. depos.

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Purpose. The present paper aims to enhance methodology for determining the safety and stability parameters of room mining systems with backfilling of the mined-out area when mining uranium ores in underground mines of the State Enterprise “Skhidnyi Mining and Beneficiation Plant” (SE “SkhidGZK”). Methods. The analytical research method used in the presented paper includes the analysis of previous relevant instructions and reports on the research performed at the SE “SkhidGZK”, as well as publications on the subject, operational geological survey documentation containing monitoring data on the stress-strain state of the rock mass surrounding the formed cavities and the actual state of the mined-out blocks in all underground mines of SE “SkhidGZK”. Findings. The research performed enables development of a new instruction for determining the safety and stability parameters of the room systems with backfilling when mining uranium ores in the SE “SkhidGZK” underground mines. Based on the developed new instruction, the stability of outcrops in mined-out rooms has been calculated, considering the actual time of their life. The obtained parameters fully correspond to actual stability of rooms in blocks of all underground mines. This indicates that the new instruction is more advanced as compared to the current Instruction and its implementation will contribute to mine safety enhancement. Originality. The increased depth of mining uranium ore in the SE “SkhidGZK” underground mines and the increase in lifetime of mined-out rooms require regular adjustment of the methodology for determining their safety and stability parameters. Based on the accumulated production experience, the observations conducted and a thorough analysis of the actual state of cavities, new and adjusted current dependences have been obtained that more accurately consider the impact of both determined factors and those unprovisioned in the current Instruction for determining the safety and stability parameters of rooms. Practical implications. The advanced methodology for determining the safety and stability parameters of room systems in comparison with the methodology described in the current Instruction at the “SkhidGZK” underground mines provides higher accuracy when determining the design parameters of rooms in the stoping blocks and greater reliability of predictive stability of both individual outcrops and rooms in general.

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Investigation into crown stability at underground leaching of uranium ores

Cited by 14 publications

References 0 publications

Enhancement of the technology of mining steep ore bodies applying the “floating” crown

Enhancement of the technology of mining steep ore bodies applying the “floating” crown

Iron ore underground mining under the internal overburden dump at the PJSC “Northern GZK”

Methodology enhancement for determining parameters of room systems when mining uranium ore in the SE “SkhidGZK” underground mines, Ukraine

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