Block caving underground mining technique under an existing open-pit mine: Investigating the effect of undercut depth on crown pillar thickness Behnam Alipenhani a, *, Erfan Amini b, Hassan Bakhshandeh Amnieh a, and Abbas Majdi a a School of Mining Engineering, College of Engineering, University of Tehran, Tehran, Iran. A B S T R A C T
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At the end of the open-pit mining process in large metal mines, the mining model must change from open-pit mining to underground mining, but the mutual interference between the two mining models leads to poor production safety conditions and difficulties in production convergence during the transition period. To solve these technical problems of poor production …
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Mass or bulk mining methods include open pit mining, block or panel caving, sublevel caving and open stoping in decreasing order of scale. ... In order to ensure open pit slope stability, the thickness of the crown pillar at ShiRenGou iron ore mine was set as 22 m. 29, 36 If the crown pillar was not recovered, it would result in a permanent ...
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Non-pillar sublevel caving offers the advantages of simple operation, high-intensity mining, high mechanization degree, safety and reliability, and relatively low mining costs [1–4]. Therefore, it has been widely used in ore mining at home and abroad [5]. The purpose of mining is to discharge ore under the overburden, leading to a large loss
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The embodiment of the invention discloses a bottomless column caving blasting mining method based on accurate time delay of an electronic detonator, and relates to the field of underground mining of metal mines. The breaking degree of the rock can be improved, and the damage of blasting to the back row eyebrow line is reduced. Comprising the following steps: drilling: …
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Non-pillar sublevel caving offers the advantages of simple operation, highintensity - mining, high mechanization degree, safety and reliability, and relatively low mining costs [1–4]. Therefore, it has been widely used in ore mining at home and abroad [5]. The purpose of mining is to discharge ore under the overburden, leading to a large loss ...
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The block caving mining method has become increasingly popular in the last two decades. Meanwhile, Indonesia has several potential ore bodies which have not yet determined suitable mining methods. The references to block caving mining projects worldwide and the potency of metal deposits in Indonesia were reviewed to determine the requirements of ore …
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Ore is blasted from sublevels created below the ore body. Once the ore is removed, the rock above collapses into the empty space. The ore and waste rock are collected from the base of the mine. Applications. Massive ore bodies: Sublevel caving is ideal for mining large ore bodies, such as iron ore and copper deposits.
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The embodiment of the invention discloses a bottomless column caving blasting mining method based on accurate time delay of an electronic detonator, and relates to the field of underground...
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This barrier is commonly termed as Crown pillar. It is nothing but the ore bearing rock that is left at the bottom of the open pit for support of underground workings and to extract the ore deposit existing at greater depth safely. ... Mainly method of mining was either block caving or sub-level caving except Shirengou iron ore mine, presence ...
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Caving mining method can be divided into single layer caving mining method, slicing and caving mining method, pillar sublevel mining caving method, sublevel caving mining method and block caving mining method. ... 8 Types of Iron Ore Magnetic Separator. (04:03:13) Research on Vat Leaching Test of A Small Gold Mine. (02:03:25)
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In block caving, a large section of ore is initially undercut by drilling and blasting, creating a large unsupported roof that will start to collapse under its own weight and instability, The broken ore then breaks apart and falls into a series of pre-constructed funnels, or drawbells, and access tunnels developed underneath the caving rock ...
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Rational and effective options for sublevel caving methods are proposed, ensuring increased ore extraction rates, the use of self-propelled mining equipment in all technological processes of...
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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 ...
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Using this lost ore mining method, the Malmberget mine had recovered 7.5 million tons of lost iron ores from many old production drifts, as reported in the year 2016.
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THE Montreal mine, operated by the Montreal Mining Co., is four miles west of Ironwood, Mich., in Iron County, Wisconsin. It is the westernmost producing property on the Gogebic Iron Range of the Lake Superior district. Its production is 4000 tons of hematite per day from an average depth of 2300 ft. This tonnage is hoisted through a five-compartment vertical shaft. Several mining …
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Download Citation | Caving mechanism of hangingwall rock and rules of surface subsidence due to no-pillar sub-level caving method in an iron mine | Presented a case study and gave a detailed ...
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Sme Mining Engineering Handbook 3rd Edition _ D Kirk (PDF) vols
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Based on the data of global mineral production and ore recovery in mining and mineral processing, this paper presents the annual production of 25 minerals and calculates the annual losses of 20 ...
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Non-pillar sublevel caving is beginning to use large structural parameters in China. Appropriate structural parameters can effectively control the loss and dilution of stope and improve ore ...
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Room and pillar mining is one of the oldest and most common methods of underground mining. It involves excavating large "rooms" of ore while leaving behind "pillars" …
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Broken rock mass and unreasonable stope structure parameters can cause excessive ore loss and dilution in sublevel caving; this is the main problem faced by caving mining in recent years. This paper proposes a stope structure parameter optimization method suitable for steeply inclined medium-thick broken ore bodies and evaluates the reliability and effectiveness …
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4. Usability Productive and flexible mining method with certain degree of ore loss. About 60% resources can be recovered. Can be used for mining suitable underground coal seams. In India, about 98% of underground output of coal is obtained by Room and Pillar method and barely about 2% by longwall methods. Gypsum, Uranium, Iron etc. ores are also mined. …
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Lei (2018) took pillar mining as the research object and analysed the inuence of four pil-lar mining schemes on surface stability through numerical simulation. Deng et al. (2018, 2019a, b) and Xia et al. (2018, ... thick ore body caving mining. Chengchao Iron Mine introduction General situation of engineering geology
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In this paper, stope structure optimization during sublevel caving mining is considered under the condition that the isolated draw zones (IDZs) are nonstandard ellipsoid, which is realized by ...
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The stress-strain state forecast and geomechanical assessment of ore extraction technology using sublevel drifts at a depth of 800 m shows that the design parameters of the mining system meet the ...
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Based on the actual situation of the mine and the experience of domestic mine recovery, this study proposes to use the bottomless column caving method and the room column method to …
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Can be used in the educational process of institutions of higher and secondary vocational education when teaching disciplines in mining. Keywords: rich iron ores, sublevel caving, actual mining, angle of ore, ore figure, ore rate, self-propelled machinery REFERENCES. 1. Stupnik, M., Kolosov, V., & Kalinichenko, V. (2013).
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Block caving, specifically, is a process that involves undermining an ore body and then allowing it to collapse under its own weight. The broken ore then falls into funnels (draw …
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Pillars are used in various forms in underground mining. For several decades pillar design has been an issue in both soft and hard rock underground mining. The major use of …
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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 …
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As the world's largest resource production and consumption country, China is rich in mineral resources, but its per capita occupancy is lower than the world average.
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Introduction. The main part of rich iron ores (73%) is mined in the Kryvyi Rih iron ore basin, most of which(160.5 million tons) are characterized by a low strength and stability.Problem Statement.
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Traditional mining methods for hanging-wall ore-body include surface mining and back-fill stoping method such as that in the Fenghuangshan Iron Mine of China and the Kidd Creek Zinc-copper Mine of ...
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