Geodynamic Hazard Assessment for Tectonic Structures in Underground Mining of North Ore Bodies in the Oktyabrsky Deposit

2019 ◽  
Vol 55 (1) ◽  
pp. 77-87
Author(s):  
V. A. Uskov ◽  
A. A. Eremenko ◽  
T. P. Darbinyan ◽  
V. P. Marysyuk
Keyword(s):  
Hazard Assessment ◽  
Underground Mining ◽  
Tectonic Structures ◽  
Ore Bodies

scholarly journals Using Topographic Advantages in Formulating a Strategy to Access Ore Bodies at Ban Phuc Nikel Mine

2020 ◽  
Vol 174 ◽  
pp. 01013
Author(s):  
Hung Nguyen Phi ◽  
Thang Pham Duc
Keyword(s):  
Underground Mining ◽  
Mineral Deposit ◽  
Access Method ◽  
Near Surface ◽  
Ground Support ◽  
Mining Technique ◽  
Ore Body ◽  
Ore Bodies ◽  
Gain Access ◽  
Transport Potential

There are various types of underground mining that are categorized based on the kind of shafts used, the technique of extraction and the process used to get to a deposit. Development mining is composed of excavation almost entirely in (non-valuable) waste rock in order to gain access to the orebody. To start the mining, the first step is to make the path to go down. Development, the work of opening a mineral deposit for exploitation is performed. With it begins the actual mining of the deposit. Access to the deposit must be gained either by stripping the overburden, which is the soil and/or rock covering the deposit,to expose the near- surface ore for mining or by excavating openings from the surface to access more deeply buried deposits to prepare for underground mining. The type of underground mining technique used is typically based on the geology of the area, especially the amount of ground support needed to make mining safe. When using to exploit ore body by underground mining method, the textbook guide in universities of Vietnam had had 4 main strategies include: access by horizontal tunnel lines, access by incline shaft, vertical shaft and combination of above access method. In this study, we developed a solution outside of four above approaches, to take advantage of the topography, transport potential energy, and advantages when constructing sloped incline, backward from outside to inside.

Fault Distribution, Segmentation and Earthquake Generation Potential of the Philippine Fault in Eastern Mindanao, Philippines

2015 ◽  
Vol 10 (1) ◽  
pp. 74-82 ◽  
Author(s):  
Jeffrey S. Perez ◽  
◽  
Hiroyuki Tsutsumi ◽  
Mabelline T. Cahulogan ◽  
Desiderio P. Cabanlit ◽  
...  
Keyword(s):  
Seismic Hazard ◽  
Hazard Assessment ◽  
Seismic Hazard Assessment ◽  
Tectonic Structures ◽  
Active Tectonic ◽  
Earthquake Generation ◽  
Geometric Segmentation ◽  
Fault Distribution

The 1,250-km-long, NNW-trending, arc-parallel Philippine fault, one of the world’s most active tectonic structures, traverses the Philippine archipelago and has been the source of surface-rupturing earthquakes during the last four centuries. In this paper, we will discuss Philippine fault distribution and segmentation in Mindanao Island by integrating detailed fault mapping together with new geological and paleoseismic data and the analysis of historical surface-rupturing earthquakes. Using geometric segmentation criteria, we have identified nine geometric segments separated by discontinuities such as en echelon steps, bends, changes in strike, gaps, steps and bifurcation in the surface trace. Fault segments ranges from 20 to 100 km in length and are capable of generating earthquakes ofMw6.6 toMw7.4. The results of our study have important implications for earthquake generation potential and seismic hazard assessment of the Philippine fault in Mindanao Island.

Frame mine structure for underground mining of thick ore bodies

2021 ◽  
pp. 11-18
Author(s):  
V. A. Eremenko ◽  
A. R. Umarov ◽  
Yu. P. Galchenko ◽  
N. A. Lipnitskiy
Keyword(s):  
Underground Mining ◽  
Ore Bodies

The Prediction of Northern Slope Deformation and Failure Caused by the Transformation of Open-Pit to Underground Mining in the Yanqianshan Iron Mine

2014 ◽  
Vol 580-583 ◽  
pp. 364-370
Author(s):  
An Lin Shao ◽  
Hai Long Feng
Keyword(s):  
Slope Failure ◽  
Underground Mining ◽  
Limit Equilibrium ◽  
Failure Process ◽  
Open Pit ◽  
Northern Slope ◽  
Body Distribution ◽  
Ore Bodies ◽  
Sublevel Caving ◽  
Iron Mine

<span><p class="TTPAbstract"><span lang="EN-US">The Yanqianshan<a name="OLE_LINK94"></a><a name="OLE_LINK93"></a> iron mine is preparing to transform from an open-pit mine to an underground mine. We adopt the <a name="OLE_LINK104"></a><a name="OLE_LINK103"></a>non-pillar sublevel caving approach to exploit the particularly thick steep ore bodies within the range from -183 m to -500 m from top to bottom. According to the features of ore body distribution and the approaches of exploitation, we expect that underground mining will result in <a name="OLE_LINK102"></a><a name="OLE_LINK101"></a>the loss of stability on the northern slope of the open pit, causing traction-type landslides. Moreover, along with increasing the depth of the mining operation, the range of slope failure will continue to expand and further affect the safety of drainage features and roads distributed on the north side of the open pit. For this purpose, we select f</span><span lang="EN-US">our</span><span lang="EN-US"> sections along the trending direction of ore bodies and apply the limit equilibrium method to predict the failure process and characteristics on the northern slope according to the stratified mining process.</span><span lang="EN-US"><o:p></o:p></span></p>

Rock Pressure Activity Regularly due to Underground Mining of the Deep Phosphorus Ore with Several Inclination by Similar Material Simulating Experiment

2014 ◽  
Vol 529 ◽  
pp. 260-264
Author(s):  
Xiao Shuang Li ◽  
Yao Ji Li ◽  
Meng Lai Wang ◽  
Shu Hu
Keyword(s):  
Rock Pressure ◽  
Phosphate Rock ◽  
Underground Mining ◽  
Phosphate Group ◽  
Systematic Research ◽  
Overburden Rock ◽  
Deformation And Failure ◽  
Ore Bodies ◽  
Dip Angle ◽  
Space Range

On basis of the geology mining condition of the deep ore bodies of north mining area of Two-hang hau of Jingning mine of Yunnan phosphate group Co. Ltd, the strata behavior regularity of the working-face in the process of underground mining was systematic research with the dip angle of twenty degreen and fity degren. The result showed that:(1) after the underground mining of the phosphorus ore , the stress bearing of the excavation phosphate rock transfer to the surrounding rock mass, the initial rock stress was disturbated, this process has been extend outward with the expansion of the excavation space, deformation and failure problems has been happened, and the new stress equilibrium will be formed in the last, mined-out area was formed after ore body,s excavation, near the gob roof area formated stress unloading area, stress formed in certain areas ahead of the stope roof pressurization district, with the excavation of the ore bodies, the roof stress pressurization district dynamic forward position, the pressurization district scope and degree of pressure also decreases as the excavation scope of mined-out area space and gradually increase, and is located in the rear area of the stope deformation of old goaf roof damage fracture belt and the abscission zone was gradually closed. and in the mined-out area space range after reaching a certain size tends to be stable,then recovery section stress and to support its upper part of the gravity of overburden rock. (2)As the orebody dip Angle increases, the same excavation space range, goaf in front of the maximum stress concentration factor was reduced, unloading of overburden rock and concentrated area of the whole range becamed smaller, the rock pressure activity becamed easing as a whole. Relevant results can provide Yunnan phosphate group co., LTD., subordinate to the mines and mining under similar conditions of phosphate rock mountain project to provide certain reference basis.

scholarly journals Rock Burst and Actually Effective Bolting for Rock Burst Prevention

2019 ◽  
Vol 4 (2) ◽  
pp. 103-110
Author(s):  
Ngoc Minh Nguyen ◽  
Duc Thang Pham
Keyword(s):  
Rock Burst ◽  
Underground Mining ◽  
Horizontal Stress ◽  
Great Depth ◽  
Underground Structures ◽  
Tectonic Structures ◽  
Mining Conditions ◽  
Constant Resistance ◽  
Deep Underground ◽  
Energy Absorbing

Rock burst represents a very dangerous phenomenon in deep underground mining, as well as for underground structures in unfavourable conditions (great depth, high horizontal stress, proximity of major tectonic structures, etc.). The rock burst problem relates to the natural and mining conditions of the rock mass. The evaluation of rock burst is becoming increasingly important as mining activities reach greater depths. In the literature, rock burst assessment challenge was tackled by many researchers using various methods. However, no study providing review and comparison of different rock burst assessment methods is available. In this paper, rock burst classification is briefly summarized. This includes a classification based on rock burst type, and another classification based on rock burst severity. As an important method for rock burst prevention, some novel energy-absorbing bolts were developed. These bolts demonstrate constant resistance under both static and shock loads and large elongation ability enabling them to withstand large deformations of rock masses under rock burst-prone conditions. Among the novel energy absorbing bolts, Modified Cone Bolt (MCB) and Constant Resistance at Large Deformation (CRLD) Bolt are selected to be presented in this paper.

scholarly journals EXTRACTION OF OPEN PIT BOTTOM RESERVES BY ROOM-AND-PILLAR METHOD USING HYBRID BACKFILL

2021 ◽  
Vol 2 (4) ◽  
pp. 205-215
Author(s):  
Sergei A. Shchukin ◽  
Aleksandr A. Neverov ◽  
Sergei A. Neverov
Keyword(s):  
Underground Mining ◽  
Strain Analysis ◽  
Open Pit ◽  
Structural Elements ◽  
3D Fem ◽  
Ore Bodies ◽  
Mining Safety ◽  
The Stability ◽  
Limiting Case ◽  
Mine Roof

For the transition from open pit to underground mining in thin and steeply dipping ore bodies, it is proposed to use the room-and-pillar method with hybrid backfill. The geotechnology assumes bottom-up mining within levels which are generally sequenced top downward. The hybrid backfill is waste rock and rubble concrete. The authors discuss the multivariate problem on the stability of structural elements of the geotechnology with ranking of basic parameters in the field of natural tectonic stresses. The geotechnology safety is proved by the 3D FEM-based stress-strain analysis of the limiting case of mine roof spans. The stress patterns in the structural elements of the technology are determined, and the areas of instability are identified. The rubble concrete pillars effectively ensure mining safety with the discussed technology. The hybrid backfill as against rock fill is a more reliable method of ground control, especially in case of increasing thickness of ore bodies.

scholarly journals Selective underground mining of complex structured ore bodies of Kryvyi Rih Iron Ore Basin

2018 ◽  
Vol 60 ◽  
pp. 00041 ◽  
Author(s):  
Vsevolod Kalinichenko ◽  
Serhii Pysmennyi ◽  
Nataliia Shvaher ◽  
Olena Kalinichenko
Keyword(s):  
Iron Content ◽  
Iron Ore ◽  
Underground Mining ◽  
Ore Deposits ◽  
Thickness Ratio ◽  
Operating Costs ◽  
Ore Body ◽  
Ore Bodies ◽  
Selective Mining ◽  
To Receive

Selective mining of complex structured ore bodies will enable increased iron content in the mined ore mass in underground mining at Kryvyi Rih iron ore basin applying the existing mining systems. The article determines the way the grade changes in a mine block of a complex structured ore body when applying bulk and selective mining as well as factors influencing indices of extracting ore mass from the block. The investigation results prove that it is reasonable to mine complex structured ore deposits with barren inclusions applying selective mining if the iron content in the block varies from 64 to 67% and horizontal thickness of the barren inclusion makes 4 – 12 m. At that, the thickness ratio should not exceed 0.3. Stoping methods should be applied to receive high indices of ore mass extraction. There is determined an ore/barren inclusion-to-ore body thickness ratio considering the dilution factor that confirms practicability of selective mining of complex structured ore bodies. Selective mining of complex structured ore deposits of Kryvyi Rih iron ore basin applying open stoping enables increasing the mined ore mass quality without considerable capital and operating costs and, consequently, staying on the market and enhancing the environmental situation in the region.

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