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    25 December 2017, Volume 33 Issue 12
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    Characteristics and Formation Mechanism of the Tectonic Schist in the Old  Metamorphic Rock Series of Bayanwula Mountain
    LIU Yan-Xiang, 　Zhuang-Ding-Yuan , 　Shi-Ming-Yuan , 　Chen-Zhi-Geng
    2017, 33(12):  10-14. 
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    The characteristics and formation mechanism of the tectonic schist in the old metamorphic rock series of Bayanwula Mountain,from the study aspects of macrostructure and microstructure.The analysis of microstructural deformation characteristics of quartz and mica minerals show that the brittleductile transition characteristics.The Baiyanwula Mountain tectonic schist is formed by the early nearhorizontal slip structure deformations,and it is experienced the superposition transformation of the mylonitization action formed by the late stage ductile shearing effects.The above analysis results related to the tectonic schist in the old metamorphic rock series of Bayanwula Mountain can provide some reliable reference for the further study on the regional structural characteristics and restoration of regional geological history of the Bayanwula Mountain Area.
    Geochemical Characteristics and Genesis of the Mafic Dikes in Daba Rock Mass in Guangdong Province
    WANG Chun-Shuang
    2017, 33(12):  15-19. 
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    The mafic dikes in Guangdong Daba Rock Mass is distributed with NWW trending and near EW trending.Based on rock sampling analysis results of the study area,the geochemical characteristics and genesis of the mafic dikes in Dam Rock Mass in Guangdong Province are studied in detail.The study results show that:the main elements of the mafic dikes show that it is belongs to intraplate tholeiite and calc-alkali series;the trace elements are rich in large ionic lithophile elements K,Rb and Th,and lack of Ba,Sr,Zr,Nb and Ti;the fractional distillation characteristics of rare earth elements in rock samples is not obvious,the light rare earth element is slightly enriched,Eu anomaly is not existed basically,which is similar to intraplate basalt;the TiO2 contents of the mafic dikes is closely similar to the one of basalt of lithospheric mantle;the ratio of trace element elements show that trace elements is derive from the mantle source region that the trace elements is enriched relatively;the rock genesis is belongs to the stretching production of weak tectonic belts after plate subduction.
    Geophysical and Geochemical Anomaly Characteristics and Prospecting Potential of Nanyang Area in Ruichang City,Jiangxi Province
    HU Lang-Ming-　Liao-Wei-Fu-　Liu-Qi-Zhi-　Yuan-　Ting-　Chen-Hou-Yang
    2017, 33(12):  20-25. 
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    The Nanyang Area of Ruichang City is located in the JiujiangRuichang metallogenic belt.Wushan Copper Deposit and Chengmengshan Copper Deposit are found in the belt,which is presented with multiple metallogenic geological characteristics.The soil geochemical survey method,EH4 electromagnetic sounding method,IP intermediate gradient method and highprecision magnetic survey are used in this area,based on the above geophysical prospecting results,the comparison analysis of the main metallogenic space and regional metallogenic characteristics is done,which indicated that the metallogenic conditions of the depth of the Nanyang Area is good.The regional geophysical and geochemical anomaly characteristics is analyzed in detail,and the anomalies are verified by using drilling engineering,the copper sulfide mineralized body is found in the expected position.Based on the regional geophysical and geochemcial characteristics and geological characteristics,and the comparison analysis results of these characteristics and geological and mineralization characteristics of the regional typical mines,the main prospecting directions and prospecting potential of Nanyang Area are discussed.
    Geochemical Characteristics and WSn Deposit Prospecting Potential of the Granite Diorite in Northern Nachitai of East Kunlun Mountains
    DENG Hong-Bin-　Wei-Hua-Cai-　Yao-　Bo-　Sun-　Ping
    2017, 33(12):  26-31. 
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    Based on the rock sampling analysis results,the geochemical characteristics of Northern Nachitai of East Kunlun Mountains is discussed.The study results show that the rock is formed in Lower Silurian,the geochemical characteristics of granite diorite show that the rock mass is distributed in high potassium calc alkaline zone,the light rare earth elements is more enriched to high rare earth elements,Eu negative anomaly characteristics is significant,the granite diorite is wholly characterized by Stype granite.Based on the above analysis results,the relationship between 1〖DK(〗∶〖DK)〗50 000 geochemical comprehensive anomaly and element characteristics is discussed,the analogy analysis with the relationship and metallogenic geological condition of the newly found WSn deposit in the area is done.The study results show that the rock mass age is very close to granite age that is the WSn metallogenic parent rock,the granite diorite has the typical metallogenic parent rock characteristics of WSn deposit,besides that,the contents of W,Sn,Bi and Au of 1〖DK(〗∶〖DK)〗50 000 geochemical comprehensive anomaly are high.The comprehensive study results indicated that the prospecting potential of WSn deposit in the granite diorite in Northern Nachitai of East Kunlun Mountains is good.
    Boundary Division of the Upper and Lower Section of Longtan Formation in Huanglan Mining Area in Youxian County,Hunan Province
    LONG Xin-Liang
    2017, 33(12):  32-34. 
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    The minable coal seam is distributed in the lower section of Longtan formation coal series in Lancun Mining Area in Youxian County,Hunan Province.The geological background,sedimentary characteristics,stratigraphic sequence characteristics of Longtan Formation,characteristics of minable coal seams of Huanglan Mining Area are discussed in detail,the results show that: Longtan coal series of Lancun Mining Area is formed in the stage of transgression system (sequence 2) of Late Permian,the controlling effects of ancient environment to coal seam formation is significant,which is similar to the geological background,sedimentary characteristics and coal seam genesis of Huangfengqiao Mining Area.Based on the above discussion results,the boundary division standard of the upper and lower section of Longtan formaiton in Huanglan Mining Area (Huangfengqiao Mining Area and Lanfeng Mining Area) is analyzed,so as to provide some reliable for the edge and deep prospecting of coal seam in Huanglan Ming Area.
    Geological Characteristics of Prospecting Direction of Manganesebearing Rock Series and JingxiDaxin Area,Guangxi Province
    QIN Chu-Li
    2017, 33(12):  35-38. 
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    JingxiDaxin Area in Guangxi Province is an important gathering area of manganese deposit in China. The manganese deposit in the area is mainly distributed in the Mnbearing rock series of Upper Devonian Liujiang Formation (D3l), Wuzhishan Formation (D3w) and the Lower Carboniferous Luzhai Formation (C1lz).The Manganesebearing rock series is affected by the evolution of regional tectonic evolution,it is hosted in the narrowlong sag manganeseforming basin formed by the strikeslip mechanism of XialeiLingma fault and its development and continuous neritic shelf groove.Based on the geological investigation results and some related geological prospecting and exploration results of the area,the geological characteristics,distribution regularity,deposit genesis and prospecting direction of Manganesebearing rock series of the area are discussed in detail,the results show that the distribution regularity of Manganesebearing rock series and sedimentary environment area closely related to petrographic paleogeography environment,the distribution characteristics,scale and grade of manganese deposit are controlled by Manganesebearing rock series,the prospecting potential of the corresponding strata and orecontrolling structure of Manganesebearing rock series in the area is huge.
    Optimization of the Hole Network Parameter of Mediumlength Hole Blasting in Tonglushan Mine
    LU Chao-Feng-　Zhou-Ke-Li-　Yin-Dong-Sheng-　Xiong-Guo-Xiong
    2017, 33(12):  39-42. 
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    Based on the actual situation of middle deep hole blasting in Tonglushan mine, the method of field test is adopted to optimize the parameters of blasting hole network. Change the layout of the hole from rectangle to triangle, the cut hole above average depth is 0.5 m, and the interval charge method and smooth blasting method are adopted by the side holes, the detonating sequence is optimized, the hole network parameters is adjusted to 1.6 m×1.0 m instead of 1.2 m×1.2 m. The results show that, the blasting large rate and the unit consumption of explosive material are both reduced effectively by using the optimized blasting network parameter, besides that, the roof and edge of stope after blasting are more smother than the ones of stope by using original blasting parameters, the safe guarantee for ore drawing operation is provided, and the good economic and social benefits are achieved.
    Application of the Curtain Grouting Technique in the Superlarge Cavern of a Mine
    吕　Bin-　Pan-　Jie-　Huo-Sheng-Qiang-　He-Rui-Feng
    2017, 33(12):  43-47. 
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    Slipping system is the important part of underground mine, and it takes an important role in the production and construction of underground mine. The slipping system of a mine is distributed underground, the cavern excavation of slipping system is influenced by the complicated geological environment and technical conditions. By analyzing the geological and hydrological situations comprehensively, the construction method of surface curtain grouting is adopted, the surrounding rock of slipping system is consolidated, the fissures of surrounding rock is filled by slurry, so as to improve the geological environment. The drilling workloads is reduced, the whole construction period is shortened, and the engineering cost is lowered by using the branch drilling technique. The successful application results of curtain grouting technique in superlarge cavern can guarantee the excavation of the caverns of slipping system safety and with high efficiency, besides that, the further construction conditions is provided. The above discussion results in this paper can provide some reliable experience for the construction of the similar caverns.
    Experiment on Artificial Pillar Construction by Grouting in an Underground Mine
    YANG Ba-Jiu-１　Hou-Ke-Peng-２　Sun-　Wei-２　Wang-Yong-Gao-３　Wang-Jian-Gui-３
    2017, 33(12):  48-51. 
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    The isolated pillar in underground mine is broken down frequently, and the existing stope is often disturbed by large amount of waste rock. According to the existing problems in underground mine, the processing method is proposed by constructing artificial pillar in loose body by grouting technique. Based on the actual situation of 1010 stope in Songshujiao Mine, the dimension of artificial pillar is calculated based on the gravity retaining wall theory, the structural parameters of artificial pillar is simulated and verified by adopting finite element software, the results show that, the stability of artificial pillar can be guaranteed with the dimension of 30 m×28 m×14 m, and the grouting scheme is designed. The industrial experimental results indicated that the artificial pillar in loose body is constructed successfully, the disturbance of waste rock is eliminated effectively from the adjacent gob, and the stope stability is guaranteed, about 15 693 t resources from the pillars are obtained, therefore, the economic benefits is good.
    Experiment on Flotation of a Mixed Lead and Zinc Ore in Xinjiang Wang YanfengLi Fubo
    WANG Yan-Feng-　Li-Fu-Bo
    2017, 33(12):  81-85. 
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    There are 5.67% lead and 8.50% zinc in a mixed lead and zinc ore in Xinjiang.The ore has a high oxidation rate,and lead sulfide accounted for 76.01% of total lead,zinc sulfide accounted for 61.66% of total zinc.The useful minerals have complex dissemination,which liberate difficultly.To determine the appropriate beneficiation process,full bulk flotation and partial bulk flotation principle flow test were carried out.The results show that the index of partial bulk flotation is better than that of full bulk flotation process.The lead and zinc bulk concentrate with grade of 22.04% lead and 23.85% zinc,recovery of 71.56% lead and 52.39% zinc were obtained, via grinding (-0.074 mm 70%)one roughingtwo cleaningstwo scavenging closed flotation process.
    Experiment on Reverse Flotation of a Collophanite in Guizhou
    ZHANG Zhou-Wei-１　Chen-Wen-Xiang-１, ２　Huang-Yuan-Ling-１
    2017, 33(12):  86-89. 
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    P2O5 grade of a collophanite ore is 24.66% in Guizhou，whose content of MgO is relatively high,collophanite and dolomite are main minerals.In order to highly efficiently recycle phosphor from the ore,experiment using single flotation was conducted.Results show that,at the grinding fineness of 74.76% passing 0.074 mm,taking anionic agent OSS as collector,taking phosphoric acid as regulator,phosphor concentrate with P2O5 grade of 34.68%,recovery of 92.61% was obtained via the closed-circuit flowsheet of one roughingone cleaning.It also verified that reverse flotation and reagent system was theoretically feasible by zeta potential experiment and adsorption capacity measurement.
    Beneficiation Experiment on a Low Grade MicroFine Particle Lead Zinc Ore in Guangxi
    CHEN Duan-Yun
    2017, 33(12):  90-96. 
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    The lead and zinc grade of a low grade microfine particle lead zinc ore in Guangxi province are 0.95% and 3.01%.The embedded size of lead and zinc minerals are very fine，which mainly existing in galena and blende,and iron and barite could be comprehensive recovered.In order to develop this ore resource reasonably,processing experiment was carried out.To balance the contradiction between overgrinding and monomer separation of objective mineral,rod milling was chosen. Equal settling ratio theory was adopted to determine proper sieving classification size.Lead concentrate with lead grade of 53.07% and recovery of 78.76%,zinc concentrate with zinc grade of 63.71% and recovery of 83.54% were obtained via classification shaking table gravity separationmagnetic separation.At the same time,iron concentrate and barite concentrate were also recovered.The whole flow did not need reagent,and the high efficiency and friendly to environment separation was realized.
    Beneficiation Experiment on a Refractory Mixed Ore of Magnetite and Specularite
    XIAO Jin-Xiong
    2017, 33(12):  97-101. 
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    For high efficient recycling mixed ore of magnetite and specularite from Anhui,on the basis of ore properties,stage grinding,low intensity magnetic separationscreeningmid magnetic separationhigh intensity magnetic separationanionic reverse flotation process was decided to adopt,under the condition of one coarse grinding,qualified iron concentrate products can be obtained in advance by combination process of low intensity magnetic separation and screening; by adding mid magnetic separation technology can effectively reduce the magnetic inclusions in high intensity magnetic separation,finally get the iron concentrate with yield rate was 39.65%,iron grade of 66.91%,iron recovery rate was 80.57%,test index is good.
    Flotation Test on High Oxidation Copper Ore  Li Guo Yao
    LI Guo-Yao
    2017, 33(12):  102-104. 
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    There is 2.85% copper in an oxide copper ore，with an oxidation rate of 87.65%，copper mainly exists in form of malachite，follows by chrysocolla and chalcocite.In order to provide technical basis for the development and utilization of the ore，beneficiation test by sulfide flotation method was conducted.Experimental results show that via grinding to -0.074 mm 60.41%,using amyl xanthate as collector，ethylenediamine sulfate and ammonium bicarbonate combination reagent (with dosage ration 1〖DK（〗∶〖DK）〗1) as activator,two roughingtwo cleaningtwo scavenging closed flotation process,copper concentrate with grade of 29.46% and recovery of 82.16% were eventually obtained.
    Stability Study on the High and Steep Rock Slope Under the Influence of Excavation
    GUAN Xiao-Feng-　Wang-Tian-Lu-　Lu-Jing-Biao-　Chen-Jian-Hua-　Xu-Yun-Fu
    2017, 33(12):  163-167. 
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    In order to improve the ore production of a openpit mine,the slope extension is done by improving slope angle and increasing mining depth, so the high and steep rock slope is formed. The stability of the high and steep rock slope is done, so as to guarantee the safety production of the mine. The FLAC3D software is adopted to conduct simulation analysis, by considering the initial stress state of the slope, the balance calculation is done based on the actual excavation procedures of the slope, the slope excavation procedures is simplified under the principle of from top to down, from outside to inside, so as to analysis the final physical state of the slope. The study results show that, the vertical displacement of the slope is the largest, the horizontal displacement of the slope is the largest, the slope displacement velocity is tend to 0; the maximum principal stress and minimum principal stress are both increased from the top to the bottom of the slope; the shear plastic zone is appeared in the bottom of the slope. The above analysis results further show that, the slope is stable overall, the instability probability of upper rock unstable area is existed; the rock mass is mainly for shear failure, the slope stability can be influence by the shear stress concentration of the bottom of the slope and shallow slope; shear failure is appeared in the bottom of the slope. After the excavation of the slope, it is necessary to take support for the rock mass failure areas, so as to stop the rock mass falling and the inner rock mass falling layer by layer after the slope surface is destructed.
    Optimization of the Ventilation Scheme in Tonglushan Mine
    LU 　Bo
    2017, 33(12):  168-172. 
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    The deep mining engineering is constructed and it is put into production, the ventilation system of deep mining is interacting with the original ventilation system, which results in ventilation short circuit, and with the mining sections moving down, the ventilation of the working face of mining sections is more and more difficult, the ventilation management difficulty is increased. Based on the actual investigation results of the ventilation system of Tonglushan mine, the main problems existed in the mine is analyzed, and some practical ventilation schemes is proposed. By ventilation scheme comparison, the unite ventilation scheme is selected. The optimal ventilation schemes of the three relatively independent ventilation unites formed based on the orebody distribution characteristics. The results show that, the ventilation system short circuit of the mine is solved, besides that, the air volume of the underground mining stope is guaranteed, which can provide some reliable reference for the improvement of ventilation system of the similar mines.
    Evaluation of Heavy Metals Pollution in Soil of Dump in a Abandoned Mining Area, Northern Guangdong
    LI Jun-Jie-　Li-Ding-Qiang-　Liao-Yi-Shan
    2017, 33(12):  234-238. 
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    Studying the distribution and pollution of heavy metals in the soil of dump in abandoned mining areas can provide scientific basis for pollution control and ecological restoration.Via measuring 5 heavy mental elements，such as Cr，Cd，Pb，Hg and As in abandoned mining areas of Northern Guangdong，the pollution condition of dump weathering soil were analyzed and evaluated by geoaccumulation index and potential ecological risk index.Results show that the relationships between AsCr and AsCd were positive correlation，and the positive correlation relationships were found among the organic matter and Hg，As，Cr，Pb with significant difference in statistics.In terms of geoaccumulation index，Cd reached moderate pollution level，Hg appeared no pollution，Cr and Pb were heavy pollution level.The order of pollution level among the elements was Cr>Pb>As>Cd>Hg.In terms of potential ecological risk index，Pb reached most severe potential ecological risk level，Cd appeared the more serious level，Hg，Cr and As were in lower ecological risk level in every research area.The potential ecological risk index followed the order of Pb>Cd>As>Hg>Cr.The analysis and evaluation results of the soil pollution were consistent using two indexes.The main heavy metal pollutant in the research areas was Pb，which made the most severe pollution on environment.Therefore，the prevention and control of Pb pollution should be strengthened in the mining area.