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    25 November 2017, Volume 33 Issue 11
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    Combined Mining Scheme of the Ores with Extremely Complex Overburden of  the Hanging Wall Ore in Gushan Iron Mine of Masteel
    SHI Yong-Bao
    2017, 33(11):  1-3. 
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    According to the original scheme II period of the hanging wall ore of Gushan Iron Mine of Masteel,the excavating engineering in -90 m level with the height of 10 m,the chamber roof of -90 m middle section is close to backfilling body in openpit mining pit,the recovery rate is less than 50％and mining safety cannot be guaranteed.The combined mining scheme of the two middle sections of -100 m and -82 m is designed,taking ores distributed in 6# transverse drift region of -100~-82 m level as the study example,the designed mining sequence is chamber mining first,then flling goaf;chamber mining secondly,then,filling goaf;mining the pillars thirdly,then filling the goaf.The shallow hole shrinkage and subsequent filling method is adopted,the measures of reserving roof security pillars and roof supporting are taken,so as to guarantee the stability of roadway surrounding rock mass.The application results of the combined mining scheme show that,the recovery rate (90％) in increased significantly,the production costs is reduced and the mining safety is guaranteed.The combined mining scheme proposed in this paper can provide some reliable reference for the mining activities of the similar mines.
    Stability Analysis of the Surrounding Rock of the High Sublevel Open Stoping Subsequent by Filling Mining Roadway in a Iron Mine
    ZHU Xiao-Long-　, WANG 　Liang
    2017, 33(11):  4-8. 
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    The high sublevel open stoping subsequent by filling mining method is adopted in a iron mine in recent years.In order to guarantee the stability of roadway surrounding rock during the mining process,the mining supporting process of the mining method is simulated and analyzed by using FLAC3Dsoftware,and the changing characteristics of stress and displacement of roadway surrounding rock before and after the mining of upper and lower layers are discussed in detail,and the rationality of the structural parameters and supporting parameters of the stope are verified.
    Geological Characteristics and Deep Prospecting Potential of Nahangou polymetallic Deposit in Nanning City,Guangxi Province
    ZHU San-Niu, 　Chen-Ai-Guo , 　Xiong-Yan-Ping
    2017, 33(11):  43-49. 
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    Damingshan Area is located in the western part of Nanling polymetallic metallogenic belt,it is the important polymetallic orefield.Nahangou Wpolymetallic deposit is distributed in the northwest of Damingshan Anticline,and the west of Qifeng Short Axis Anticline.The metallogenic of Nahangou mining area is closely related to IndosinianYanshanian granite,deep fracture and its fissure system,the orebodies are controlled by formation lithology to some extent.Based on the prospecting and exploration results of Nahangou Wpolymetallic deposit,the distribution characteristics of formation,structure and magmatic rock of the mining area are discussed systematically,the mineralization types are divided,and its distribution characteristics are studied in depth.The study results show that:①Nahangou mining area is located in the west wing of Qifeng Short Axis Anticline,the strata of the mining is distributed with monoclinal type,the strata exposed in the mining with large areas is Lower Devonian Yujiang Formation (D1y),Lower Devonian Nagaolign Formation (D1n) only distributed in the northeast of the mining area,Huangdongkou Formation (∈3h) of the Upper Series of Cambrian System and Lower Devonian Lianhuashan Formation (D1l) are both concealed strata in the mining area;②faults are well developed in the mining area,the fault types is mainly for NW trending fault,secondary for NE trending fault and near EW trending fault,SN tending fault is rare in the mining area;③the magmatic activities are developed frequently in the mining area,the magmatic activities are developed from Indosinian to Yanshanian,the magmatic rocks in the mining area is mainly for Yanshanian intrusive rock,it is distributed with the types of rock strains,rock dykes and rock dikes;④W-polymetallic mineralization types in the mining area can be divided into stratabound type mineralization and porphyry type mineralization,the stratabound mineralization is the most important mineralization type in the mining area,the mineralization development in the mining area is controlled by strata,structures and granite.Based on the above discussion results,combing with the deep prospecting and exploration results in the mining area obtained in recent years,the comprehensive analysis results show that deep prospecting potential of the mining area is good.In order to realize prospecting breakthrough of deep prospecting work in the mining area,it is suggested that drilling engineering should be further conducted,so as to control the deep orebodies and verify the magnetic anomalies and geochemical anomalies in the mining area,electrical methods can be used to found the concealed bodies in the depth of mining area.The above study results related to the geological characteristics and deep prospecting potential of Narhangou Wpolymetallic deposit in Nanning City,Guangxi Province can provide some reliable reference for further conducting prospecting and exploration works of Wpolymetallic deposits in the mining area or the whole Damingshan Area.
    Geological Characteristics and Genesis of Ase Gold Deposit in Western Sichuan Province
    TANG 　Ping, 　Zhou-　Bing , 　Li-Xun-Zhe , 　Lu-　Bo
    2017, 33(11):  50-54. 
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    Ase gold deposit is located in the north of Hengduan Mountains and the east of the upstream of Jinsha River,its tectonic location is distributed in Yidun syncline of Yidun eugeosyncline fold belt of SongpanGanzi geosyncline.Through the analysis of regional geological metallogenic background,geological characteristics of the mining area and deposit,the deposit genesis is discussed,besides that,the prospecting indicators are summarized systematically from the aspects of geochemical,structure,alteration and outcrop.The study results show that:①Ase gold deposit is generally controlled by F2 ductile shear zone,the shear metamorphic metallogenic hydrothermal fluid and the orehosting brittle structures can be produced by the controlling of ductile shear zone,the metallogenesis of the goldbearing formation is produced,so the gold deposits with small scale and gold oreconcentration areas are formed;②the rock activity and permeability are enhanced by ductile shearing,the migration channel of metallogenic material and metallogenic fluid are provided,so as to facilitate the future flows through all kinds of fluids which leaching into the minerals in the shear activity period and then disappear,the metallogenic materials is upper migrated along the high permeability ductile shear zone to the shallow metallogenic favorable position;③the thermodynamic condition of metallogenic elements activation and migration in strata by the emplace ment activities of (insidious) intermediate acidic mafic veins and basicultrabasic rock mass,therefore,the metallogenic activities is produced by the migration of metallogenic fluids to the fracture pressure torsion broken parts;④Ase gold deposit genesis is belongs to the tectonic alteredrock type gold deposit related to the spatial distribution of ductilebrittle shear zone under the action of the hydrothermal fluids formed by regional metamorphism.The above analysis results related to the geological characteristics,genesis and prospecting indicators of Ase gold deposit in Western Sichuan Province can provide some reliable reference for further conducting prospecting and exploration of the deposits in the area or its adjacent areas.
    Geological Characteristics and Prospecting Potential of the Chengtangdi Graphite Mining Area in Inner Mongolia
    LIU Wen-Qiang, 　Xu-Xin-Xue , 　Liang-Xue-Wu , 　Liu-Wen-Jie , 　Cao-Peng-Jun , 　He-Xing-Chen
    2017, 33(11):  55-60. 
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    Chengtangdi graphite mining area in Inner Mongolia is located in the northern margin of the North China Platform,the eastern part of Yinshan Uplift,it is belongs to EW-NEE trending advanced metamorphic rocks region in shanxi Province,Hebei Province and Inner Mongolia.Based on the geological working results and geophysical working results in the area,the geological characteristics and geophysical characteristics of the graphite deposit in the area are discussed,besides that,the favorable prospecting indicators of the mining area are summarized.The study results show that:①the graphite deposit is distributed near the side of gneiss of the contact zone of marble and gneiss of the Upper Section of Jining Formation,graphite mineralization is closely related to pyritization,the geophysical characteristics of the deposits is expressed as high polarization,mediumhigh resistance,mediumhigh time constant and low frequency correlation coefficient,the above characteristics can be taken as the favorable prospecting indicators in the mining area;②the graphite gneiss formation is widely distributed in the mining area,the graphite resources (334 resources) is bout 1 million t by prediction,the deposit genesis is belongs to crystalline graphite deposit with large scale,the prospecting potential of the mining area is good.
    Metallogenic Geological Characteristics and Prospect of Development and Utilization of Meigang Libearing Brine Deposit in Taihe County,Jiangxi Province
    ZHOU Min-Juan, 　Hu-　Li , 　Huang-Xiao-Nian , 　Han-Xue-Ping
    2017, 33(11):  61-64. 
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    In recent years,with the continuous study breakthrough of the improvement of lithium extraction technique in brine,the production process of lithium extraction is more and more perfect,lithium extraction in brine is gradually becoming the important way to the development and production of lithium salt,the prospecting and development and utilization of brine deposit will be paid more and more attention.The contents of NaCl and LiCl are high in Meigang highsalt and rich lithium type underground brine mine in Taihe County,Jiangxi Province,w(NaCl) 278 146～308 362 mg/L,the highest content of NaCl is almost 2.6 times of the industrial grade of NaCl,w(LiCl) 611～1 136 mg/L,the highest content of LiCl is almost 3.8 times of the industrial grade of NaCl,which show that the industrial value of the brine deposit is good.Based on the geological prospecting and exploration results of the mining area newly obtained in recent years,the metallogenic geological characteristics of the brine deposit is discussed,besides〖LM〗 that,the deposit genesis and source of metallogenic materials are also discussed in detail.The study results show that:①Meigang Libearing brine deposit in Taihe County is located in the east of Jitai Basin,is is hosted in Cretaceous strata,the formation of the deposit is mainly controlled by sedimentary environment;②brine orebodies in the mining area are mainly distributed the middle of the first red layer of Zhoutian Formation of Late Cretaceous Upper Series,the saltbearing layer can be divided into 7 layers,among them,the third and sixth layer are the direct orebearing layers of lithium rich saturated brine;③the deposit genesis of Meigang brine mine is belongs to the terrigenous clasticchemical rock type salts sedimentary brine deposit,metallogenic epoch of the deposit is Late Cretaceous;④chemical weathering product of mineral rocks in the catchment basin in the mining area is the main source of chemical substances of salt brine,the most of Meigang brine is deep circulating water of sedimentary brine and the main material source of lithium in basalt activities.Based on the above discussion results in this paper,the prospect of development and utilization of Libearing brine deposit in the mining area is analyzed,besides that,in order to promote the prospecting and utilization of the brine deposit in the mining area,some related suggestion about strengthening the development of lithium brine resources,paying attention to the comprehensive utilization in the development of lithium brine resources and strengthening the study of the secondary development of lithium salt.The above discussion results related to the metallogenic geological characteristics and the prospect of development and utilization of Maigang Libearing brine deposit in Taihe County,Jiangxi Province can provide further meaningful reference for conduct further prospecting and development of the deposit in the mining area or its adjacent area.
    Hydrogeological Characteristics and Engineering Geological Characteristics of Baoshan Ore Section of Jinkouling Copper Mine in Tongling City,Anhui Province
    HAN Li-Hu, 　Liu-Gu-Yao
    2017, 33(11):  65-69. 
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    The CuFe orebody hosted in the depth of Baoshan Ore Section of Jinkouling Copper Mine is the found by conducting the prospecting and exploration work of replace resources of crisis mine of Jinkouling Copper Mine,which is help for extending the service length of the mine.The hydrogeological characteristics and engineering geological characteristics of Baoshan Ore Section of Jinkouling Copper Mine are discussed in detail,and mine water in -550 m section is predicted and the stability of the surrounding rock mass is evaluated.The study results show that:①the hydrogeological unit of the mine is belongs to Baijiashan little stream underground drainage;②F11 fault is the main water conducting structure,it is located in upper of Wutong Formation of Devonian,which trending direction is consistence to the one of Tongguangshan Anticline,F11 fault is the mine fault that is controlling the Baoshan orebody,and it is the most serious water conducting structure in the future mining activities of Jinkouling Copper Mine;③according to the hydrogeological conditions of Baoshan Ore Section,the mine water inflow of -550 m section is predicted by adopting analogy method,the results show that the normal mine water inflow is 13 307.46 m3/d,the maximum mine water inflow is 16 027.83 m3/d;④the rock quality grade of Baoshan Ore Section is III grade,rock quality is belongs to medium level.
    Engineering Characteristics and Quality RMR Evaluation Method of the Rock Mass in Jinfeng Gold Mine in Guizhou Province
    LIU 　Chao, 　Fan-Wen-Liang , 　Cheng-Wen-Wen , 　Min-Zhong-Peng
    2017, 33(11):  70-74. 
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    Based on the engineering geological investigation results of Jinfeng Gold Mine in Guizhou Province,the RMR method is used to evaluate the rock quality in E3 section in 270 m and 290 middle sections of the mine from the six aspects of rock integrity,uniaxial compressive strength,joint spacing,groundwater state,joint state and the influence degree of joint occurrence to engineering construction.The study results show that:①the overall rock quality grade is Ⅳ level,the rock quality is poor;②the two groups rock mass structural planes with 2° tendency,54° inclination angle and 180° tendency,72° inclination angle are the weakest structural planes in the mining area,which affect the rock quality stability seriously,therefore,during the construction of mining engineering,the above directional structural planes should be avoided.
    Ranging Precision Calibration Experiment of Focus3D Laser Scanner
    WU Chang-Yue-　, WANG Chun-Xin
    2017, 33(11):  75-78. 
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    In order to conduct ranging precision calibration of ground 3D laser scanner,taking Focus3D laser scanner as the study example,the ranging precision calibration experiment of radial distance and spatial distance is done.The spherical targets with geometric centers are scanned by using Focus3D laser scanner to obtain the experimental point cloud data,and the fitting precision of the point cloud data is evaluated by using Geomagic Studio software.The experimental results show that the measurement precision of spatial distance of Focus3D laser scanner is 0.61 mm (≤2 mm),among the measurement distance range of 5~40 m,the radial distance measurement precision is -2~2 mm,if the measurement distance is longer than 50 m,the radial distance measurement precision is discrete.
    Discussion on the Development Feasibility of the Remaining Resources of Ⅰ Area in Dongshan Iron Mine in Maanshan City,Anhui Province
    WU 　Fei
    2017, 33(11):  79-82. 
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    In order to make full development of the remaining resources of I Area in Dongshan Iron Mine,the development feasibility of the remaining resources of I Area is discussed from the two aspects of openpit mining and underground mining.The results show that stripping ratio of openpit mining scheme are 701,743 m3/m3,and they are larger than the economic reasonable stripping ratio (571 m3/m3),so the openpit mining scheme is economically irrational,and the safety and stability of slope cannot be guaranteed by implementing the scheme;the investment of underground mining scheme is large,the aftertax investment payback period is longer than mine service duration,which indicated that the economic benefits of underground mining scheme is not obvious.The comprehensive analysis results further show that under the current market situations and economic and technical conditions,the remaining resources of I Area in Dongshan Iorn Mine cannot be developed temporarily.When the market situation is getting better and the economic and technical conditions are available,the remaining resources of I Area in Dongshan Iorn Mine can be developed.
    Ores Comprehensive Utilization Measures of Xiaoshanyu Limestone Mine in Beianzhuang Section in Laiwu Region,Shandong Province
    SONG Wei-Yuan, 　Liu-Yong-Gang
    2017, 33(11):  83-86. 
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    Taking Xiaoshanyu Limestone Mine in Gangcheng County in Laiwu City as the study example,the geological characteristics and distribution features of the limestone deposits in Baianzhuang Section of Ordovician Majiagou Formation in Laiwu Region are discussed in detail.The mining techniques of separate blasting,separate mining,separate packed and separated transported are adopted in Xiaoshanyu mining area,the ores is separated effectively from all kinds of nonmine interlayers.The ore comprehensive utilization rates is increased by producing the limestone power with high contents of magnesium and construction aggregate by using the waste rocks in mining area.Therefore,the considerable economic benefits is obtained,and the make the mining company turn from deficits to profit successfully.The above ore comprehensive utilization measures proposed in this paper can provide some reliable reference for improve mineral resources comprehensive utilization rate of the mines with the similar geological characteristics and mining technical conditions of Xiaoshanyu Limestone Mine.
    Numerical Simulation Analysis of the Chamber Stoping Stability and Insitu Stress DistributionRegularity in Hongling PbZn Mine Based on FLAC3DSoftware
    QU Zhan-Peng, 　Wang-　Kun
    2017, 33(11):  87-90. 
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    large number of goafs existed in Hongling PbZn Mine,in order to guarantee the safety mining of the mine,based on FLAC3D numerical simulation software,the stability of chambers during the stoping process and distribution characteristics of insitu stress are studied in depth.Combing with the field investigation results,indoor rock mechanical test results,the numerical model is established by using FLAC3D software,so as to evaluate the stoping stability of the chambers in four middle sections,and the analyze the influence regularities of chamber stoping to the stability of its upper or lower surrounding rock and the distribution characteristics of plastic zones.The study results show that:①chamber span,exposed area of goaf and the size difference of adjacent column are the important factors that affects the chamber risk assessment;②with the increasing of mining depth,the tensile stress and compressive stress of the roof and floor of the middle sections are appeared obviously,the tensile stress range of the upper surrounding rock of goaf is more greater;③the 3109 chamber of three middle section and 4102,4105 and 4108 chamber are belongs to the dangerous ones,it is necessary to take some relative supporting measures.
    Optimization on the Design Scheme of Mining and Ore Dressing of a Mine by Considering the Market Price of Iron Ore
    WANG Ren-Zhen
    2017, 33(11):  91-94. 
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    In recent years,the international market price of iron ore drops large,the economic benefits of iron mines in our country are influenced seriously,quite a number mines are shut down or closed.Under the current market conditions,the original design scheme of mining and ore dressing can be optimized to some extent based on the the distribution conditions of the ore-bodies and mining technical conditions of different mines,so as to improve the main economic and technical indicators,reduce the mine production costs and obtain the better economic benefits.Taking a mine located in the northwestern of our country as the study example,the existing design scheme of mining and ore-dressing of the mine is analyzed in detail,the economic and technical evaluation results of the scheme show that the net present value of the scheme is negative,which indicated that the scheme is not feasible.Based on the above analysis results,according to the ore-body distribution characteristics,the existing design scheme of mining and ore-dressing of the mine is optimized by changing mining scope and design production scale,adjusting some related system engineering.The mine production scale and mine development scale of the optimization scheme are smaller than the ones of the original scheme,besides that,the mine infrastructure engineering and early stage investment are both reduced,therefore,some relative economic and technical indicators are improved significantly.The study results related to the optimization on the mine design scheme of mining and ore dressing can provide some reliable reference for the similar mines.
    Application of Multiproduct Comprehensive Development and Utilization Technology in Lowgrade Iron Mine
    LUO Xiao-Xin, 　Huang-Xiao-Yi , 　Ma-Xuan-Heng
    2017, 33(11):  101-104. 
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    Aiming at iron geological grade is far lower than the industrial grade of a low grade iron mine in Shaanxi,which results in high concentration ratio,large amount of waste,large amount of waste and mine tailings storage pressure,mining,dressing and tailings comprehensive cost high and have no development value,multiproduct comprehensive development and utilization technology was put forward.Characteristics of this technology are: mining openpit stripping waste rock can be used in the production of building stone; after preliminary screening,more selective dry separation and discarding barren rock,barren rock can produce building stone,the ore has been enriched enters stage grinding and classification magnetic separation to get iron concentrate; tailings after enrichment and filter is used as cement accessories and tailings bakingfree brick.By multiproduct comprehensive development,traditional iron mine development single iron concentrate product project,promoted to give priority to iron powder,railway ballast,building stone,cement supplementary,tailings aerated concrete block is complementary product solutions,make waste to treasure,solve high cost of development low grade iron ore and core issue of large amount of waste,economic benefit is obvious; at the same time,the diversification of products has extended the industrial chain and greatly enhanced the enterprise′s resist risks ability.
    Effect of Slurry pH on Flotation of LeadZinc Sulfide Ore
    LIU Cheng-Xin, 　Fu-Jin-Tao , 　Yun-　Xia
    2017, 33(11):  105-107. 
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    Xitieshan leadzinc mine mineral processing workshop has four series production lines,that is Ⅰ,Ⅱ,Ⅲ,Ⅳ,production process is complex,not only reagent used but also pH adjust value are different. To reasonably control pulp pH,via single factor tests,influence of flotation pH on lead concentrate and zinc concentrate grade and recovery about various stages was investigated. Investigated results showed that,leadzinc ore has good floatability in a certain pH range,higher or lower than this range,floatability of leadzinc ore will great influenced. Also,pH value can influence activity of flotation reagents,flotation reagents needs certain pH to stable existence. Xitieshan leadzinc mine mineral processing workshop production lines Ⅰ,Ⅱ,Ⅲ uses low alkaline flotation process,mainly recovery lead,zinc,sulfur. Ⅳ series uses high alkaline flotation process,mainly recovery lead,zinc.
    Discussion on the Chemical Composition of Iron Tailings of Baiyun Obo Ore
    WANG 　Min, SHEN Mao-Sen
    2017, 33(11):  108-111. 
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    To find Baiyun Obo iron tailings of each elements distribution and enrichment situation in various size grade,chemical analysis were conducted,also further analysis were conducted via computer office,excel software drawing.Results indicated that chemical composition of different grain size tailings can not only reflect the distribution of various elements in different grain size,but also reflect rich information of the mineral composition and particle size of tailings in a certain degree which has the great guiding significance to the optimization of selection process.A lot of useful information can be obtained by using multi element analysis of different particle size of the same kind ore which is worth to be popularized and applied in the research of process minerals.
    Flotation Experiment on a Leadzinc Oxide Ore
    RAO Qiang-Jian
    2017, 33(11):  117-120. 
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    Lead and zinc mineral are finely disseminated in a low grade leadzinc oxide ore. Lead oxidation rate is high, lead oxide minerals in grinding process is easy to produce Pb2+, have certain activation to sphalerite, increases difficult of lead zinc separation. Vulcanization process, namely, adding sodium sulphide in ball mill, not only activated lead oxide ores, but also weakened the Pb2+ activation of sphalerite. Experiment with zinc sulfate and sodium sulfite as inhibitors of zinc mineral, 25# aerofloat and butyl ammonium aerofloat as collector of lead mineral, realize recycling of lead mineral; Lead flotation tailings via sulfur suppression and zinc float technique, with lime as inhibitors of pyrite, copper sulfate as sphalerite activator, xanthate as collector, recovery of zinc mineral was realized. Eventually closed circuit test for lead concentrate has 66.25% Pb, 4.60% Zn, lead recovery rate is 80.13%; zinc concentrate has 57.93% Zn, 1.84% Pb, zinc recovery rate is 88.77%, index has reached expected effect.
    Experimental on Minerals Processing of Magnetic Ore in Xinjiang
    LIU Xiu-Yun
    2017, 33(11):  121-123. 
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    In order to improve recovery of an iron ore in Xinjiang,based on system research of raw ore properties,at grinding fineness is 30% -0.074 mm,with one roughing one scavenging low intensity magnetic separation process,iron concentrate with iron grade of 68.32%,iron recovery of 83.12%,tailings of magnetic iron content is 0.42%,magnetic iron recovery was 97.15%. By optimizing conditions test,provides the technical guidance for on-site production.
    Design and Application of the Filling System Based on High Sulphur Tailings and Gobi Aggregate Structural Flow in Duda PbZn Mine
    LI Jun-Feng
    2017, 33(11):  148-151+156. 
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    According to the characteristics of high sulfur contents and fine grain of the tailings in Duda PbZn Mine,the reasonable filling materials ratio of the mine is obtained by conducting filling material tests,and the overall filling technique scheme of the mine is designed.The parameters of the filling system such as demand for filling materials are calculated,besides that,the scheme design and equipment selection of tailings grading system,broken screening system and slurry preparation system are done based on the actual situation of the mine.The techniques of filling materials broken screening and tailings grading are optimized by conducting the operation test of newly established filling system,so,the new filling system that is suitable for the characteristics of high sulfur fine tailings and gobi aggregate in Duda PbZn Mine is developed.The operation results of the filling systems show that the filling system with the characteristics of stable operation,high degree of automation,less techniques process,less investment,shorter construction period and better filling effects,which can provide some reliable reference for the similar mines.
    Application of Digital Electronic Detonator in the Mediumlength Hole Blasting Construction in Longdongbao Airport
    ZENG 　Shuai, 　Chen-Hong-Bing
    2017, 33(11):  152-156. 
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    Guiyang Longdongbao Airport T2 terminal building with complex environment,large blasting volume,and the airport with large passenger traffic flows,many tall buildings and construction facilities.During the blasting construction,the safety of personals,traffics and buildings and facilities in the airport around the construction area should be guaranteed.The technical requirements of blasting construction under the above environmental conditions is high,the blasting construction is very difficult.The mediumlength hole blasting construction scheme based on digital electronic detonator is proposed.The optimal delay time is obtained by conducting many tests,the delay time (15~20 ms) is optimized.The engineering practice results show that the massive phenomena happened during the blasting process is not only prevented,the influence of blasting vibration to the airport environment and instrument facilities is controlled effectively,but also the blasting comprehensive costs is reduced significantly by the implementation of the mediumlength hole blasting scheme.The mediumlength blasting scheme proposed in this paper can provide some reliable reference for the similar engineering.
    Failure Law and Support Techniques of Mining Roadway in Huipodi Coal Mine
    YANG Yi-Kun
    2017, 33(11):  182-186. 
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    In order to analyze the failure law of the fully mechanized coal mining working face on the roadway surrounding rock,taking the 11105 fully mechanized working face of Huipodi Cola Mine as the engineering background,the failure law of roadway surrounding rock in the stages of working face excavating and working face stoping is studied by using FLAC3D numerical simulation software.The study results show that after the excavation of roadway,the stable condition of roadway surrounding rock is good,the failure of surrounding rock is not significant,with the moving distance of 11105 working face,the vertical stress of the roadway is increased from 11.67 MPa to 23.33 MPa,the twosided displacement of the roadway is 564 mm and the roof subsidence of the roadway is 242 mm,which indicated that the stability of surrounding rock is poor.Based on the above analysis results related to the failure law of mining roadway surrounding rock,the advanced supporting technique is adopted to deal with the 111051 and 111052 roadways of 11105 working face,the specific implementation scheme of supporting technique is discussed,and the supporting parameters are given,so as to provide some reliable reference for controlling the roadway surrounding rock stability under the similar conditions of Huipodi Coal Mine.
    FLAC3D Numerical Simulation of the Supporting Optimization Scheme of Hongtai Coal Mine
    HOU Zhi-Yuan, 　Guo-Zhi-飚 , 　Chi-Xue-Hai
    2017, 33(11):  187-191. 
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    The original supporting scheme of 26B# stoping roadway of Hongtai Coal Mine can be described as two rows of 18 mm rebar anchors,the length of anchor is 1.6 m,the anchor intervals and anchor row spacing are both 1 m,the floor and two sides of roadway are not supported.Through field investigation and analysis,under the action of mine pressures,fissures and separation phenomenons are existed in the upper of roadway roof,and the convergence between roof and floor of the roadway is significant.In order to ensure roadway stability,the original supporting scheme is optimized,the supporting optimization scheme is proposed.The new scheme can be described as the rebar anchor is used as the supporting method of the complete area of roadway floor,the crushing area of roadway floor can be processed by using anchor cable.In order to determine the suitable arrangement method of anchor and anchor cable and some relative important supporting parameters,the numerical simulation model is established by using FLAC3D software,and the numerical simulation of surrounding rock displacement field,surrounding rock stress field and surrounding rock plastic zone.Based on the above numerical simulation results,the supporting optimization scheme can be determined as three rows anchors are set in roadway floor,the length of anchor is 1.8 m,the anchor intervals and anchor row spacing are both 0.8 m;two anchors and one anchor cable can be used to deal with the crushing area of roadway floor,the anchor intervals and anchor row spacing〖LM〗 are both 0.8 m,the length of anchor cable can be determined based on roadway surrounding rock stability conditions.The supporting optimization scheme of Hongtai Coal Mine proposed in this paper can provide some reliable reference for the roadway supporting of other mines.
    Numerical Simulation of Water Dielectric Interval Charging in Barun Mine
    SHAO Hong-Guang, 　Wang-De-Sheng , 　Huang-　Mian , 　Lan-　Dun , 　Ma-Yi-Chao
    2017, 33(11):  192-195. 
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    In the process of bench blasting in deep concave openpit mine,the phenomenon of water hole is happened generally,so,the poor blasting effects (high large rate of the top of hole and many blasting foundations are occurred at the bottom of hole) can be occurred.During the process of water hole blasting,the influence of different waterlayer location to blasting effects is different.According to the actual production situation of Barun Mine,under the conditions of the waterlayer is located at the bottom or middle of blasting hole,the different charging structures are simulated and analyzed from the simulation aspects by adopting fluidsolid coupling algorithm model based on the nonlinear dynamic analysis software LSDYNA.The simulation results is analyzed,the unit effective stress cloud diagram and the maximum effective stress of the hole bottom and step slope are analyzed comprehensively,the transmission characteristics of the stress wave after blasting is discussed,besides that,the advantages and disadvantages of different charging structures are also studied in depth.Based on the above discussion results,some meaningful conclusions are obtained,and some suggestions about optimizing water hole blasting operation are given.
    Numerical Simulation Study of the Feasibility of 24 m High Bench Deep Hole Blasting in Barun Iron Mine
    LAN 　Dun, 　Wang-De-Sheng , 　Huang-　Mian , 　Shao-Hong-Guang , 　Ma-Yi-Chao
    2017, 33(11):  196-199. 
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    In order to analyze the feasibility of 24 m high bench deep hole blasting in Barun Iron Mine,the continuous charging structure and hole bottom initiation method are used by the 24 m and 12 m bench blasting method,and the bench blasting processes are numerical simulated by using ANSYS/LSDYNA software,so as to analyze the stress variation regularities during the process of bench blasting.The study results show that rock stress variation regularities are consistent with each other,and the stress levels of the monitoring points located at the bottom and top of the bench are comparable,which show that the rocks broken effects of the bottom and top of the bench are both good,therefore,the feasible of 24 m high bench deep hole blasting in Barun Iron Mine is good.
    Technical Scheme for Gas Extraction of the Working face in Low Permeability Coal Seam in High Outburst Pit in Hudi Coal Mine
    CHENG Jun-Jie
    2017, 33(11):  200-203. 
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    The gas control technical measures about gas emission by wind,bedding drilling and downward drilling of roof are obtained in Hudi Coal Mine.With the increasing of the production scale of Hudi Coal Mine,the above gas extraction technical measures can not guarantee the gas concentration of working face within the safety scope of indicators.Taking the working face of 3# coal seam in Hudi Coal Mine as the study example,the technical scheme for gas extraction of the working face in low permeability coal seam in high outburst pit is studied.According to the scheme,the gas can be extracted effectively by adding coal seam floor rock roadway and setting roof penetrating drills in the rock roadway,besides that,combing with the ground coalbed gas wells and the scheme proposed in this paper to extract the gas in the area without any mining or stripping activities.The practice results of the scheme proposed in this paper show that the gas extraction quantity is increased from 6.6 m3/min to14.48 m3/min,the gas gas extractive rate is increased from 18% to 40.5%,the gas extraction effective of the working face can meet the requirements of gas extraction,the gas overrun problem of the working face is solved,and the safety and efficient production of the working face is guaranteed.
    Optimization and Design of the Ventilation System of a Gold Mine in Shandong Province
    LIU Chang-Jiang, 　Wang-Lin-Hong , 　Zhou-　Wei , 　Dai-Guang-Xu , 　Xu-Jing-Long , 　Xia-Gong-Ze
    2017, 33(11):  204-207. 
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    The status of the ventilation system of a gold mine in Shandong Province is investigated and evaluated,the problems such as unsufficient of mine overall air volume,lacking of ventilation shaft engineering and improper distribution of air volume of middle sections.In order to solve the above problems,the systematic optimization study of the ventilation system of the mine is done by using ventilation network optimization technique,machine station optimization technique and ventilation fan optimization and selection technique,and three ventilation system optimization schemes are proposed.By comparative analysis of the ventilation system optimization schemes,the scheme that is taking the ventilating shaft newly digged in 54# line,so as to form the single wing diagonal extraction ventilation pattern is selected as the optimal one.The threedimensional ventilation dynamic simulation software Ventsim is adopted to calculate the ventilation network optimized by the new scheme.The results show that after the optimization of the ventilation system,the overall air volume can be reached to 47.53 m3/s,the working efficiency of the main fan is 85％,the number of ventilation managers is decreased,the labor intensity of ventilation management is reduced,the labor productivity is improved,besides that,the ideal economic benefits can be obtained.
    Optimization of Goaf Filling Scheme of Linong Ore Section of Yangla Copper Mine in Yunnan Province
    CHENG 　Yong, 　Yang-Ba-Jiu , 　Liu-Jian-Long
    2017, 33(11):  208-211. 
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    Many goafs can be left by using open stope mining method.The safety production and effective recycling of mineral resources of mine are affected by the existence of goaf,which caused the loss of mineral resources.The main mining methods of Linong Ore Section of Yangla Copper Mine are chassis funnel open stoping method,comprehensive method,nearsurface caving method and roomandpillar mining method.After many years mining production,the volume of goaf is reached to 1 175 500 m3.Based on the actual production situation of the mine,the filling scheme is adopted to deal with the goaf,and the filling scheme is optimized by using FLAC3D numerical simulation method,and the filling method and filling body strength are determined.The above study results related to the optimization of goaf filling scheme of Linong Ore Section of Yangla Copper Mine can provide some reliable reference for goaf treatment of the mine or the similar mines.
    Slope Angle Determine and Slope Stability Analysis of Liberia Bang Iron Open-pit Mine
    KE Da-Yi
    2017, 33(11):  212-217. 
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    Liberia Bang Iron Mine is a larger oversea open-pit iron mine of China.The stability of the slope formed by large scale mining activities in the further is the key factor to guarantee the safety open-pit mining of the mine.In order to determine the reasonable slope angle of the mine,the safety coefficients of the slopes with different final slope angles and the working slopes with different slope step slope angles are calculated by adopting limit equilibrium method.The recommended values of final slope angle and working slope angle under the conditions of meeting the safety requirements are given.By conducting stability numerical simulation of typical slopes with the recommended values of final slope angle,the deformation characteristics and plastic zone distribution characteristics of the slope rock mass are analyzed in detail,besides that,the rationality of the slope angle determined by using limit equilibrium method in this paper is verified.
    Influence ofTailings DamStability by Continuous Discharge of Paste Tailings
    SONG Zhi-Fei, 　Ma-　Teng , 　Zhao-Ze-Yin , 　Xu-Hong-Da
    2017, 33(11):  218-221. 
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    In order to analyze the application effects of sinking dam method by building dike,the basic concepts of the method is analyzed,taking a mine as the study example,the SRM and SAM modules of finite element analysis software MIDAS is adopted to analyze the influence of Continuous discharge of past tailings to the tailings dam stability.The results show that with the discharging of past tailings,the stability of tailings dam is decreased,but the decreasing trend is not significant,which indicated that the influence of continuous discharge of paste tailings to the stability of tailings dam is small.
    Technological Process Design of a Mine in Inner Mongolia
    LIU Chun-Guang, 　Wang-Li-Ming , 　Li-Hong-Jing , 　Jia-　Jia
    2017, 33(11):  1112-116. 
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    A Mine in Inner Mongolia according to original nature of ore,via stage grindinglow intensity magnetic separationhigh intensity magnetic separationreverse flotation and stage grindinglow intensity magnetic separationspiral chutehigh intensity magnetic separationreverse flotation two process comparison and study,and combined with design experience to determine this type mine's principle process and related process parameters,corresponding design suggestions are put forward.