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Table of Content

    25 July 2026, Volume 42 Issue 07
    Previous Issue   
    Research Progress on Flotation Recovery Technology of Low-grade Phosphate Ores
    DING Kaizhen ZHAO Keke CAO Ran ZHU Shiman CHENG Jun
    2026, 42(07):  1-6，64. 
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    In order to make efficient use of low-grade phosphate ore resources，the development sta⁃ tus and research progress of low-grade phosphate ore flotation technology are reviewed in view of the com⁃ plex problems of its associated gangue minerals. The characteristics of low-grade phosphate ore resources， the necessity of development and the distribution of global phosphate ore resources are briefly introduced. The flotation process，collector and foam control technology are mainly described.In terms of flotation pro⁃ cess，the positive flotation，reverse flotation，combined process and double reverse flotation process are summarized，and their advantages and disadvantages are analyzed. In terms of collectors，the research re⁃ sults of anionic collectors，cationic collectors and amphoteric collectors are summarized，and the effect of collector modification and compounding on improving flotation efficiency is emphasized.In terms of foam control technology，the synergistic effect of foam regulator and combined agent is emphasized. In view of the progress of reagent optimization，flotation process improvement and foam control technology，the future research direction is prospected，aiming at improving the recovery rate and resource utilization efficiency of low-grade phosphate ores.
    Study on Separation Process and Mechanism of a High-sulfur Low-grade Copper-Lead-Zinc Ore
    LI Bingrong¹ , ² SHI Lei¹ , ² DU Xin¹ , ² LI Xi¹ , ² WANG Yan¹ , ²
    2026, 42(07):  7-12，17. 
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    In order to solve the problems of low recovery efficiency of valuable metals and high risk of separation pollution in a high-sulfur low-grade copper-lead-zinc polymetallic sulfide ore in southwest China，a systematic process mineralogy test is carried out for its low grade of valuable metals，high pyrite content，fine mineral dissemination，serious flotation interference and difficult separation. The mineral composition，dissemination symbiosis characteristics and monomer dissociation law of the ore are identi⁃ fied，and the internal mechanism of the ore is revealed.Through the condition optimization test，a clean separation process of cyanide-free copper lead mixed flotation-copper lead separation-zinc flotation-sulfur comprehensive recovery is constructed. The green collector and cyanide-free composite inhibitor are used to realize the efficient separation of multi-metals and the comprehensive recovery of associated gold，silver and cadmium.The results show that the lead concentrate with lead grade of 56.24% and lead recovery of 89.58%，the copper concentrate with copper grade of 18.62% and copper recovery of 90.14%，the zinc concentrate with zinc grade of 48.26% and zinc recovery of 89.09%，and the sulfur concentrate with sulfur grade of 44.22% and sulfur recovery of 66.71% are obtained by the whole process closed-circuit test. The associated precious metals and scattered metals are enriched and recovered simultaneously.The cyanide�free green separation process has excellent separation index，which can provide theoretical basis and engi⁃ neering technical reference for the green and scaled development of similar complex polymetallic ores in Southwest China.
    Experiment on Removal of Potassium Feldspar from a Refractory Siliceous-calcareous Collophanite in Hubei
    ZHAO Yuanyuan LIU Xing
    2026, 42(07):  13-17. 
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    In order to effectively solve the problem that the traditional phosphate rock reverse flota⁃ tion to remove potassium feldspar cationic collector must be used in conjunction with the adjustment agent， in view of the problem of difficult flotation separation of a medium and low grade siliceous calcium phos⁃ phate rock in Hubei，the reverse flotation test of coarse-grained phosphate rock and fine-grained phos⁃ phate rock is carried out.The results show that when Z-1 is used as collector to remove potassium feldspar， the phosphate concentrate with P2O5 grade of 31.15%，Al2O3 content of 1.74% and P2O5 recovery of 82.21% can be obtained by reverse flotation of coarse-grained phosphate rock without using any acid and alkali.The phosphate concentrate with P2O5 grade of 30.82%，Al2O3 content of 1.80% and P2O5 recovery of 57.79% can be obtained by reverse flotation of fine-grained phosphate rock. The collector Z-1 has excel⁃ lent selective collecting ability for potassium feldspar，and the reagent cost is 7.9 yuan/t lower than that of the traditional reagent，which can provide reference for the efficient separation of similar refractory phos⁃ phate rock and the removal of potassium feldspar.
    Beneficiation Process Optimization Test of a Lean Magnetite Ore in Liaoning
    YIN Peng YUAN Li
    2026, 42(07):  18-22. 
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    In order to effectively develop and utilize the increasingly depleted magnetite resources and deal with the problems of high energy consumption and high cost of traditional beneficiation process，a typical lean magnetite ore in Benxi is taken as the research object，and the process optimization test of large dry preconcentration-high pressure roller mill crushing-wet coarse preconcentration is carried out. The effects of three core process parameters of dry pre-separation magnetic field intensity，high pressure roller mill closed-circuit screening particle size and wet pre-separation magnetic field intensity on the sep⁃ aration index are investigated systematically.The results show that the CTDG 0604 dry magnetic separator is used for dry preconcentration and tailing discarding under the magnetic field strength of 437.69 kA/m. The dry-discarded concentrate is crushed by GM100/30 high-pressure roller mill under the condition of 3 mm closed circuit. The high-pressure roller mill product is then subjected to secondary preconcentration by CTB 0403 wet magnetic separator under the magnetic field strength of 238.74 kA/m.Under this optimal process flow，the total tailing discarding rate of 65.45% can be achieved before the ore enters the final grinding，of which the dry discarding rate is 23.51% and the wet discarding rate is 41.94%. The iron grade of the grinding material is significantly increased from 16.48% to 44.87%，and the iron recovery rate is as high as 93.97%.The energy-saving process flow constructed in this study realizes the“throwing waste as early as possible”of gangue minerals，which can provide technical path and engineering reference for the efficient and green development of low-grade magnetite of the same type.
    Flotation Process Optimization and Industrial Application of a Low-grade Fine-grained Scheelite in Henan
    JI Pengfei HONG Yan LEI Shan TIAN Mingling LI Panjing
    2026, 42(07):  23-27. 
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    In order to realize the efficient resource utilization of a low-grade and micro-embedded complex scheelite in Henan Province，aiming at the technical problems of difficult separation and poor sep⁃ aration effect，the systematic flotation process optimization and industrial test research are carried out.The optimum process parameters of the roughing section determined by the test are as follows: grinding fineness of -74 μm 61.5%，soda ash dosage of 1 400 g/t，collector Fx-6 dosage of 450 g/t，inhibitor SG dosage of 15 g/t. After optimization，the rough concentrate with tungsten grade of 0.81% and tungsten recovery of 80.62% can be obtained.The optimal process parameters of the cleaning section are as follows: the dosage of reagent removal agent Yixiang high sodium water glass is 55 g/t，and the concentration of the selected slurry is 27%.The industrial test results show that the optimized process is suitable for the on-site high-al⁃ kali backwater system. The tungsten grade of the concentrate is increased from 22.21% to 25.21%，and the tungsten recovery rate is increased from 66.91% to 76.14%. It can provide engineering reference for the re⁃ source utilization of similar refractory tungsten ore.
    Flotation Test on Improving Quality and Efficiency of a High-silicon Low-grade Fluorite Ore
    DING Danyang ZHAO Jianfei
    2026, 42(07):  28-31. 
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    In order to realize the efficient utilization of a high-silicon low-grade fluorite ore re⁃ source，aiming at the problem of the quality deviation of the fluorite concentrate，the experimental re⁃ search on the optimization of the flotation reagent system，the regrinding of the coarse concentrate and the addition of acidified water glass are systematically carried out.The test results show that the grade of CaF2 in concentrate is increased to 95.30% after the optimization of flotation reagent system. The regrinding of rough concentrate is beneficial to the increase of CaF2 grade of concentrate，but the recovery rate of CaF2 of concentrate decreases obviously. When the rough concentrate is reground to -0.075 mm 97.23%，the CaF2 grade of concentrate reaches 98.46% and the recovery rate is 40.58%.Acidified water glass is used as the inhibitor. When the coarse concentrate is reground to -0.075 mm97.23%，the CaF2 grade of the concen⁃ trate is 98.66% and the recovery rate is 44.74%. However，the industrial applicability of acid water glass is poor.In the flotation verification test，one roughing-one scavenging-one cleaning process and six cleaning processes after regrinding of coarse concentrate are adopted. Under the conditions of one-stage grinding fineness of -0.075 mm 50%，roughing sodium carbonate dosage of 1 000 g/t，sodium silicate dosage of 200 g/t，oleic acid dosage of 200 g/t and roughing concentrate regrinding fineness of -0.075 mm 97.23%， the high-quality fluorite concentrate with CaF2 grade of 98.55%，recovery of 41.99% and SiO2 content of 1.11% is obtained.It meets the requirements of fluorite concentrate quality standard（YB/T 5217—2019） FC-97.5C，and has remarkable economic benefits. It can provide technical support and theoretical basis for the efficient development and utilization of similar high-silicon low-grade fluorite ore.
    Research on the Current Situation and Strategic Path of Mineral Resources Exploration and Development in Hubei Province
    HUANG Li ZHANG Changlin WANG Manli HOU Li WANG Xiaomin
    2026, 42(07):  32-38. 
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    In order to promote the high-quality development of mineral resources in Hubei Province and provide support for the transformation of resource-based industries and the coordinated development of regional economy，in view of the problems existing in the exploration and development of mineral resources in Hubei Province，such as the decline of exploration investment，the imbalance of industrial structure， the prominent contradiction between supply and demand，and the tightening of ecological constraints， based on the data of 2024，this paper systematically sorts out the general situation，development and utili⁃ zation status and supply and demand situation of mineral resources，deeply analyzes the core challenges and puts forward the strategic path.The results show that the advantages of mineral resources endowment in Hubei Province are prominent but the structural contradictions are significant. The mining economy is grow⁃ ing steadily but the industrial level is low. The supply and demand pattern is obviously differentiated and the shortage and surplus coexist. It is necessary to build a modern resource-based industrial system by strengthening the exploration investment guarantee，optimizing the industrial structure layout，coordinat⁃ ing the supply and demand balance regulation，and strengthening the ecological protection constraints，so as to help the economic rise of the central region.
    Research Progress on Performance Evolution and Targeted Prevention and Control Technology of Mine Chemical Dust Suppression Materials
    YANG Xiaojun
    2026, 42(07):  39-45. 
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    Mine dust is a typical associated pollutant produced in the process of mining，transporta⁃ tion and storage in mines. It is not only easy to cause occupational diseases such as pneumoconiosis，re⁃ duce operational visibility，but also has the risk of flammable dust explosion，which seriously restricts the safe production and ecological green development of mines. In order to systematically sort out the develop⁃ ment status of mine chemical dust suppression technology，clarify the technical advantages and disadvantag⁃ es of various dust suppression materials，and point out the direction of industrial innovation and develop⁃ ment，the technical system of conventional dust prevention and control in mines is systematically summa⁃ rized. The mechanism and research progress of three types of traditional chemical dust suppressants (wet⁃ ting type，bonding type and condensing type) and two types of new dust suppressants (composite type and in⁃ telligent green type) are classified and elaborated. The core innovation mechanisms such as surfactant com⁃ pounding and coordination，polymer crosslinking and consolidation，and microbial enzyme catalytic regula⁃ tion are emphatically analyzed. The dust suppression advantages and application potential of new materials such as nano-modification，intelligent response and ecological substrate are summarized. By comparing the performance differences and technical shortcomings of traditional and new dust suppressants，the innovative concept of targeted dust suppression suitable for complex mine conditions is proposed. From the perspective of interdisciplinary integration，the future technology development path of intelligent molecular design，arti⁃ ficial intelligence high-throughput screening and solid waste recycling is prospected. The research results can provide scientific reference and technical reference for the precise prevention and control of mine dust， the development and engineering application of green and efficient chemical dust suppressants.
    Optimization and Application of Digital Management Path for Mineral Resources Mergers and Acquisitions
    JIANG Hua¹ SU Chuang² ZOU Xian² JI Kai² CHEN Zhenghong¹ QIN Shitao² XI Ruiqing
    2026, 42(07):  46-50. 
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    In order to optimize the digital valuation and whole process control of mineral resources mergers and acquisitions，aiming at the problems of information asymmetry，valuation deviation and col⁃ laborative inefficiency in the digital management of mineral resources mergers and acquisitions in terms of technology adaptation，data governance，valuation model and collaborative mechanism，the model con⁃ struction and verification of the three-in-one digital management system of data governance-intelligent val⁃ uation-risk management and control are carried out.The system is based on data governance，with intelli⁃ gent valuation as the core engine and risk management and control as the security guarantee，forming a closed-loop collaborative digital management paradigm，and taking a copper mine merger and acquisition simulation as an example for verification.The results show that the IDCF-RO composite valuation model im⁃ proves the valuation accuracy by 43.5% compared with the traditional DCF method，and the comprehen⁃ sive risk index is 0.143，which is in the green security level. The system and optimized management path can effectively improve the valuation accuracy and risk management level of mineral resources mergers and acquisitions，and provide theoretical reference and practical paradigm for mining enterprises to participate in global mineral mergers and acquisitions and improve digital management capabilities.
    Study on Performance Comparison and Application Prospect of New Reagents For Molybdenum Selection
    HE Shuai ZHAO Fangli GAO Xueting YAN Ludan LEI Jinhang LIU Juanjuan
    2026, 42(07):  51-56，71. 
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    In order to promote the efficient and clean utilization of molybdenum resources and solve the separation problem of complex copper-molybdenum ore，aiming at the problems of insufficient selectiv⁃ ity，large dosage，poor environmental protection，the development process of molybdenum reagents is sys⁃ tematically reviewed，and the structural characteristics and mechanism of new collectors，inhibitors and foaming agents are emphatically analyzed.The comparison between the new reagent and the traditional re⁃ agent is carried out from the aspects of flotation index，economic cost and environmental impact. Combined with typical industrial application examples，the practical efficiency of the new reagent is verified.The re⁃ sults show that the new molybdenum reagents generally have the characteristics of strong selectivity，low dosage and environmental friendliness，but there are still limitations in industrial applicability and cost control.In the future，molybdenum reagents should be developed in the four core directions of high efficien⁃ cy，green environmental protection，low cost generalization and“reagent-process”collaborative optimiza⁃ tion，so as to break through the technical bottleneck and improve the comprehensive recovery and utiliza⁃ tion rate of molybdenum resources.
    Optimization of Stope Parameters under Quaternary Aquifer Based on Fluid-solid Coupling
    SUN Yongmao, ZHAO Fangfang ZHANG Qiang,
    2026, 42(07):  57-64. 
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    The mining of ore bodies under the thick Quaternary aquifer has the problems of instabili⁃ ty of surrounding rock，sudden change of mining seepage and high risk of water inrush. The coordinated control of mechanical stability and hydrological safety is the core of safe mining of such ore bodies. Taking the ore body above-220 m level of an iron mine in Anhui Province as the engineering background，the opti⁃ mization of stope structure parameters was studied by combining theoretical analysis with numerical simula⁃ tion. Based on the thick plate theory，combined with the geological conditions of the mining area and the state of seepage risk，the multi-level safety factor is set differently，and the design method of the safe thickness of the top pillar suitable for the sublevel open stoping with subsequent filling method is estab⁃ lished. Based on FLAC3D software，a three-dimensional fluid-solid coupling model is constructed to simu⁃ late five stope width conditions of 8，10，12，15 and 18 m，and the evolution laws of surrounding rock stress，displacement，plastic zone，pore water pressure and seepage velocity are systematically analyzed. The results show that 12 m is the critical value of the stope width in the mining area. When the mining width exceeds this value，the roof settlement，surrounding rock stress and seepage velocity increase nonlin⁃ early. The plastic zone of the roof gradually penetrates and forms a potential water channel，and the risk of mechanical and seepage coupling disaster increases significantly. Based on the comprehensive mining safe⁃ ty and production efficiency，the optimal stope structure parameters are determined to be 100 m in length and 12 m in width. The study clarifies the mechanism of mining instability and seepage mutation of ore bod⁃ies under complex hydrogeological conditions，which can provide theoretical support and technical refer⁃ ence for safe and efficient mining of similar mines.
    Study on Performance of I-beam Trapezoidal Support Structure under Asymmetric Load
    WU Tao
    2026, 42(07):  65-71. 
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    As a highly flexible passive support structure，mining I-beam trapezoidal support has been widely used in underground support. In practical application，construction defects and surrounding rock deformation may lead to the working state of trapezoidal support under asymmetric load during ser⁃ vice，which is not conducive to the full play of its strength. In view of this，a four-point loading test of 12# I-beam is carried out in this paper. Based on the ABAQUS/explicit，a refined finite element model of full�size I-beam trapezoidal support structure is established，and its response behavior under different loads (especially under asymmetric loads on both sides) is studied. The results show that the mining 12# I-beam has good stability and bearing performance，and some areas of the mid-span web remain elastic when the deflection-span ratio reaches 4.4%. The deformation of the top beam is proportional to the vertical load and inversely proportional to the lateral pressure load，and the deflection deformation of the column leg is main⁃ ly affected by the lateral pressure load. The asymmetric load makes the column leg of the trapezoidal brack⁃ et rotate. The change of the support condition and the boundary bending moment leads to the lateral dis⁃ placement rate of the bracket far exceeding 2% when the load coefficient difference between the two sides is 0.2，which is at the risk of collapse. At the same time，the top beam produces asymmetric deformation. When the load coefficient difference between the two sides is 0.4，the maximum vertical displacement in⁃ creases by 170.5% compared with the symmetrical load. In view of this，the stable contact between the sup⁃ port and the surrounding rock mass should be fully guaranteed in practical engineering.
    Study on Deformation Response Mechanism of Surrounding Rock and Optimization of High Strength Prestressed Support in Deep Mining Roadway
    GUO Jianquan LIU jing HAO Shenglei WEI Wenhui JIANG Changbao CHENG Yue
    2026, 42(07):  72-82. 
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    Aiming at the engineering problems of large deformation, insufficient strength and pre⁃ stress of traditional bolt support, and poor matching of support in deep high ground stress mining roadway under mining disturbance, taking the 183 下 06 deep mining roadway of a coal mine in East China as the en⁃ gineering background, the theoretical analysis, indoor rock mechanics test, FLAC3D numerical simulation and field industrial test are comprehensively used to systematically study the mechanism of bolt yield strength and prestress on the stress field, deformation characteristics and support stability of surrounding rock in deep roadway. By analyzing the failure mechanism of the original support scheme, five gradient high-strength prestressed bolt support optimization schemes are designed, and the nonlinear response law between the additional stress field of the bolt and the prestress is compared and revealed. Finally, a high�strength, high-prestress, and low-density collaborative support parameter system is selected. Based on the optimal parameters, a new type of high-strength prestressed anchor bolt is developed. The measured yield strength is 1 120 MPa, the tensile strength is 1 213 MPa, and the impact absorption energy is 78 J. The field monitoring results show that the new bolt support system can effectively inhibit the roof separation and the convergence of the two sides of the deep roadway. The deformation of the roof is reduced by 60% com⁃pared with the original scheme, and the deformation of the two sides is reduced by 46%. The convergence speed of surrounding rock deformation is fast and the overall stability is significantly improved. The re⁃ search results can provide engineering reference for support parameter optimization and surrounding rock stability control of mining roadway in deep high ground stress mine.
    Study on Coal Pillar Setting and Surrounding Rock Control Technology in Gob-side Entry Section of Semi-coal Rock in Gently Inclined Coal Seam
    WANG Jian LI Zhiyuan QIN Zhihong CHENG Xiang
    2026, 42(07):  83-92. 
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    Aiming at the engineering problems of coal pillar shear slip，asymmetric large deformation of roadway side and difficult support of surrounding rock in the gob-side entry of semi-coal rock in gently inclined coal seam under the action of multiple mining disturbances，taking the II7226S air roadway of Ren⁃ lou Coal Mine as the engineering background，the research methods of theoretical analysis，numerical sim⁃ ulation and field industrial test are combined. Based on the internal and external stress field theory and lim⁃ it equilibrium theory，the reasonable interval of section coal pillar is solved. The stress，displacement and plastic zone evolution characteristics of roadway surrounding rock under different coal pillar widths are compared and analyzed by multiple sets of numerical models，and the optimal size of coal pillar for road⁃ way protection is determined and the corresponding surrounding rock control technology is matched. The re⁃ sults show that the difference of mechanical strength between coal and rock and the weak structure effect of coal-rock interface are the core causes of asymmetric deformation of roadway. The upper coal seam on the side of small coal pillar is prone to shear extrusion failure along the coal-rock interface，which is the key part of surrounding rock control. The theoretical calculation shows that the reasonable interval of coal pillar is 4.6~6.1 m. The comprehensive simulation results show that the optimal width of coal pillar is 5 m. This size can effectively avoid the influence of the peak value of lateral abutment pressure in the upper goaf. The roadway and roof surrounding rock can retain a large range of elastic bearing core area，and the deforma⁃ tion of surrounding rock is significantly controlled. In view of the instability characteristics of this kind of roadway，this paper proposes a combined control scheme of strengthening support in key parts and grouting modification and reinforcement of broken surrounding rock. The field monitoring results show that the defor⁃ mation of surrounding rock tends to be stable after 40 days of roadway excavation. The maximum deforma⁃ tion of roof，floor，small coal pillar and solid coal is 68.4 mm，30.9 mm，79.1 mm and 53.2 mm respec⁃ tively，and the overall stability of surrounding rock is good. The research results can provide engineering reference for the design of coal pillar parameters and surrounding rock control of semi-coal rock gob-side roadway in gently inclined coal seam of Northern Anhui mining area.
    Study on Optimization of Structural Parameters of Upper and Lower Plate Mining of Gently Inclined Copper-Cobalt Ore with Interlayer
    SONG Zhanglun LIU Chao WANG Liang GE Ruhao
    2026, 42(07):  93-98. 
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    A copper-cobalt mine in Congo (DRC) is a gently inclined medium-thick ore body. A 10 m-thick low-grade cobalt ore interlayer is developed in the middle of the ore body. The ore body is divid⁃ ed into a 7 m-thick hanging wall ore and a 13 m-thick footwall ore. The large-scale approach and the dia⁃ mond-shaped medium-deep hole hanging wall and footwall mining method are used for mining. In order to ensure the stability of the surrounding rock of the stope and improve the mining conditions, the structural parameters of the stope need to be optimized. Taking the first mining area of the mine as the engineering background, the maximum safe span of the ore body is calculated to be 19.12 m based on the elastic sim⁃ ply supported beam theory, and four sets of matching span schemes are set accordingly. FLAC3D is used to carry out numerical simulation, and the evolution characteristics of surrounding rock stress, roof displace⁃ ment and plastic zone under different stope sizes are analyzed. Combined with the entropy -TOPSIS fuzzy comprehensive evaluation model, the multi-index scheme optimization is completed. The results show that with the increase of the width of the stope, the main stress of the two sides increases nonlinearly, and the main stress of the roof decreases gradually. When the span reaches 20 m, the tensile stress of the roof ap⁃ pears and the plastic zone expands obviously. The comprehensive evaluation determines that the optimal parameters are the footwall stope span of 18 m and the hanging wall stope width of 9 m. The scheme has good controllability of surrounding rock and is suitable for the upper and lower plate mining process, which can provide reference for the optimization of stope parameters of similar gently inclined metal mines with interlayer.
    Research on Stacking Mode Optimization and Descending Section Treatment Technology of Super-high Single-bench Dump in Open-pit Mine
    REN Hairui XU Shouxin CHENG Yingdong
    2026, 42(07):  99-105. 
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    It is easy to form a super-high single-bench dump by using the slop-directed discharge technology in open-pit mines. The slope of this kind of dumping structure is in a critical stable state for a long time，and there are engineering problems such as prominent slope instability risk，obvious ecological hidden danger and high treatment cost. In this paper，the 430 m super-high single-bench dump of an open-pit limestone mine is taken as the research object，and the granular mechanics test，engineering scheme design and limit equilibrium numerical simulation method are comprehensively used to carry out the research on stacking mode optimization and descending section treatment technology. The results of ma⁃ terial screening and triaxial test show that there are significant vertical particle size differentiation charac⁃ teristics in the super-high single-bench dump. The proportion of particles with a particle size of less than 20 mm at the top of the slope is more than 35%，and the proportion of particles with a particle size of more than 40 mm at the foot of the slope is more than 40%，and the mechanical parameters of the soil are lay⁃ ered along the vertical distribution. Through the construction of new transportation roads and the optimiza⁃ tion of rock discharge sequence in different zones，the original single super-high single-bench dumping process is transformed into a composite stacking mode of pressure slope toe combined bench and covered multi-bench. On the premise of not interrupting mine production，the grading and descending section treat⁃ ment is carried out，and the original 33°~35° natural slope angle of the dump is optimized to within 30°.Fi⁃ nally，the overall slope angle of the partition is stable at 29.40°~29.89°. The results of multi-condition sta⁃ bility checking show that the safety factor of each partition slope is significantly improved after treatment， which fully meets the requirements of the specification threshold and effectively eliminates the hidden dan⁃ ger of landslide instability. In this paper，a collaborative management and control mode of“production and management”is constructed，and the slope management is completed synchronously based on the produc⁃ tion process，which greatly reduces the special management investment of mine pit closure and the pres⁃ sure of later operation and maintenance，and can provide engineering reference for the safety management and ecological management of the same type of super-high single-bench dump.
    Study on the Coal Pillar Width in Shallow Buried Extra Thick Coal Seam Section of a Coal Mine in Xinjiang
    ZHOU Guangyu REN Dongdong WANG Deyong WANG Hailiang WEI Wenhui JIANG Changbao WU Jiayao
    2026, 42(07):  106-112. 
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    Aiming at the key problem of optimal size design of coal pillar in shallow and extra thick coal seam，taking a fully mechanized caving face of a coal mine in Xinjiang as an engineering example， the reasonable determination of coal pillar width in working face is systematically analyzed by means of physical experiment，theoretical derivation and numerical simulation. Through mechanical tests，the ten⁃ sile strength of coal is 0.69~0.82 MPa，and the compressive strength is 4.84~5.44 MPa，indicating that the mechanical properties of coal pillars are relatively weak. Based on the limit equilibrium theory and Mohr�Coulomb criterion，the vertical stress distribution model of coal pillar is established，and the reasonable coal pillar width is 19.04 m by theoretical calculation. Numerical simulation is used to further analyze the mining response characteristics of coal pillars under the condition of 14~24 m width. The results show that when the width of coal pillar increases to 19 m，the stress concentration of coal pillar is significantly allevi⁃ ated，and a stable elastic core area is gradually formed inside，and the overall mechanical state tends to be stable. At the same time，the control effect of surrounding rock deformation in the lower section of roadway is effectively improved. The comprehensive analysis results show that when the width of coal pillar is 19 m， it can effectively maintain the stability of roadway surrounding rock during mining. The research conclu⁃ sions can provide theoretical support and practical guidance for the width design of coal pillar in shallow buried extra-thick coal seam under similar geological conditions.
    Optimization of Blasting Parameters in High Altitude Open-pit Mine Based on WipFrag Block Quantitative Analysis
    TONG Xiaoyong TAN Gang YANG Yuxiang LIU Qiang WANG Lu CHEN Hui
    2026, 42(07):  113-117. 
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    The design of blasting parameters directly affects the blasting crushing quality and mining cost of open-pit mines. Aiming at the problems of serious blasting energy dissipation, uneven energy distri⁃ bution, high block rate after blasting and uneven block distribution in high-altitude open-pit mines, the op⁃ timization of blasting parameters is studied based on the deep-hole bench blasting project of an open-pit mine in Xinjiang. Initially, the rectangular hole arrangement method was adopted, and the hole row spacing is set to 6.0 m×4.0 m. Based on the blasting energy control theory, the hole arrangement form and parame⁃ ters were optimized, and the plum-shaped staggered hole arrangement was used to adjust the hole row spac⁃ ing to 5.0 m ×4.0 m. Based on WipFrag software, the fragmentation of blasting pile is quantitatively ana⁃ lyzed, and the blasting crushing effect before and after optimization was systematically compared. The test results show that the uniformity of the original blasting scheme is poor, the characteristic particle size D50 is 388.91 mm, the proportion of large blocks with particle size greater than 464 mm is 44.03 %, and the maxi⁃ mum block size can reach 1 302.09 mm. After the optimization of the parameters, the blasting effect is sig⁃ nificantly improved. Under the optimal working conditions, the bulk rate is reduced to 2.84 %, the D50 is re⁃ duced by 192.11 mm on average, the average sphericity of the rock is slightly reduced, the fragmentation is more uniform, and the maximum ore block size is reduced to 604.69 mm. The optimization scheme can ef⁃fectively improve the distribution of blasting energy, improve the efficiency of blasting operation, reduce the workload of secondary crushing, reduce the production cost of subsequent processes such as shovel loading and transportation, and provide engineering reference for the design of blasting parameters in high-altitude open-pit mines.
    Recovery Test and Industrial Practice of Micro-fine Hematite from Dahongshan Based on SLon Continuous Centrifugal Concentrator
    MENG Zhaolei DENG Qin WEN Heping WANG Han
    2026, 42(07):  118-122，135. 
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    In order to efficiently recover the -0.045 mm iron minerals in the second-stage high-in⁃ tensity magnetic concentrate of Dahongshan Iron Mine, the semi-industrial test, parameter optimization and industrial application of SLon continuous centrifugal concentrator are carried out to solve the problems of metal distribution rate exceeding 75%, poor separation effect and serious metal loss in the original shaking table process.The test results show that under the conditions of industrial optimal operating parameters of ore feeding concentration of 20%~25%, ore feeding time of 90~110 s, rinsing time of 5~25 s, ore unloading time of 8~15 s, drum speed of 180 r/min, and flushing water pressure of 0.3~0.4 MPa, when the TFe grade of ore feeding is 42%~48%, the iron grade of concentrate obtained by industrial continuous production is 52%~58%, and the iron recovery rate is 55%~66%. The combined process of high-intensity magnetic roughing + centrifuge cleaning + shaker scavenging is adopted. The iron grade of the total concentrate is in⁃ creased from 62.37% of the original process to 63.50%. The annual net economic benefit is about 62.93 million yuan, and the static investment recovery period is about 5.7 months. The combined process is green and environmentally friendly, and the application effect is stable and reliable. It can effectively solve the problem of efficient recovery of fine-grained iron minerals, and the economic benefits are remarkable.
    Optimization Test of Apatite Flotation Reagent in Iron Beneficiation Tailings
    ZHAO Keke LI Zhichao WANG Xiaoyu DING Kaizhen CHENG Congwen CHENG Jun WANG Shuai
    2026, 42(07):  123-130,135. 
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    The content of P2O5 in iron beneficiation tailings of a mine is 2.57%. The process of iron removal by high intensity magnetic separation-desulfurization by reverse flotation-degypsum by reverse flo⁃ tation-apatite by direct flotation is adopted.In order to solve the problem of high cost of flotation reagents， the effects of fatty acid chain length，unsaturation，hydroxyl introduced into the structure and the amount and ratio of combined fatty acids on the flotation of apatite，ankerite and anhydrite are explored.The results show that when the mass ratio of sodium laurate to sodium oleate is 6∶4，the floatability of apatite is the best. Under the premise of ensuring that the grade of P2O5 in phosphate concentrate is higher than 30.00% and the recovery rate of P2O5 is more than 40.00%，the dosage of reagent is reduced by 46.15%，and the cost of collector reagent is reduced by 34.19%. Satisfactory test results are obtained.
    Study of Enrichment Effect and Economic Feasibility of Photoelectric Separation for a Copper-bearing Waste Rock with Different Grade Range of Raw Materials
    LI Lihua LIU Qiu YANG Chao HONG Lang ZHOU Lu CHEN Bin ZHANG Zhonghua,
    2026, 42(07):  131-135. 
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    In order to scientifically determine the industrial development value of copper-bearing waste rock after photoelectric separation，aiming at the problem that the enrichment effect of copper-bear⁃ ing waste rock in different of grade range of raw material the mine is not clear and the economic feasibility is difficult to quantify，based on the grade and washability characteristics of different ores after separation， a whole process technical and economic model based on raw material grade interval is constructed，and a special study is carried out on the typical occurrence of phyllite-type and porphyry-type copper-bearing waste rock in a mining area.By means of metal comprehensive recovery value calculation and whole chain cost deconstruction analysis，the net income per ton of concentrate after separation is accurately calculat⁃ ed，and the quantitative results of photoelectric separation enrichment effect and economic benefit under different raw material grade intervals are obtained. It is clear that phyllite-type and porphyry-type copper�containing waste rocks can achieve effective enrichment and have positive economic benefits in their re⁃ spective suitable grade range. The photoelectric separation of copper-containing waste rock is feasible for industrial development in a specific grade range，which can provide scientific basis and technical support for the efficient utilization of copper-bearing waste rock.
    Study on Process Mineralogy of a Lithium-bearing Kaolin (Porcelain Stone) Ore
    SUN Jianan¹ PANG Longlong² MIAO Guang¹ YU Zhebin¹ CHEN Jun³ CAO Yigang
    2026, 42(07):  136-139. 
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    In order to efficiently utilize a lithium-bearing kaolin（porcelain stone）ore resource in Ji’ an, Jiangxi Province, the process mineralogy characteristics are systematically studied by means of chemi⁃ cal analysis, phase analysis, X-ray diffraction analysis and automatic quantitative analysis of mineral pa⁃ rameters. The results show that the main chemical compositions of the ore are SiO2 （73.93%）, Al2O3 （15.05%）and Li2O（0.32%）. The mineral compositions are mainly quartz（36%）, plagioclase（25%）, K�feldspar（20%）and muscovite（16%）.The lithium mica/lithium muscovite is flaky and scaly, and the main slice diameter is 0.10~1.20 mm. The particle size distribution is mainly medium and fine particles, which is closely related to the dissemination of feldspar and quartz. Lithium mainly occurs in muscovite (distribu⁃ tion rate is 81.87%), and rubidium is mainly distributed in muscovite and feldspar.The effective dissocia⁃ tion and desliming of lithium mica, feldspar and quartz is the key to the efficient utilization of the ore, which can provide a theoretical basis for the beneficiation recovery and comprehensive utilization of similar ores.
    Beneficiation Process Test of an Iron-Copper Ore in Inner Mongolia
    WANG Shuai,
    2026, 42(07):  140-144. 
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    In order to explore the separation effect of copper flotation-iron magnetic separation pro⁃ cess and iron magnetic separation-copper flotation process on an iron-copper ore in Inner Mongolia，a com⁃ parative test of two different processes is carried out on the basis of ore properties.The experimental results show that the copper concentrate with copper grade of 25.75%，copper recovery of 94.03%，iron content of 29.04% and iron recovery of 0.69%，and iron concentrate with iron grade of 69.09%，iron recovery of 89.00%，copper content of 0.015% and copper recovery of 3.06% can be obtained by two-stage continuous grinding-copper flotation-iron magnetic separation process under the conditions of one-stage grinding fine⁃ ness of -0.075 mm 60%，regrinding fineness of -0.075 mm 65%，magnetic field strength of 80 kA/m，flota⁃ tion operation collector Z-200，inhibitor lime.
    Study on Efficient Leaching of Magnesium from Iron-containing Serpentine by Fluorite Powder Under Microwave Assistance
    HUANG Wei WANG Benying SONG Wanqing ZHANG Zixuan HUANG Hanjie XIE Mengmeng
    2026, 42(07):  145-149. 
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    In order to further improve the extraction effect of valuable components in serpentine， taking the iron-bearing serpentine tailings of a concentrator in Qinghai as the research object，the effect of microwave-assisted action on the leaching of magnesium and iron under the condition of fluorite powder as leaching aid is investigated. The results show that when fluorite powder is used as leaching aid，the leaching rate of Mg and TFe is the best under the leaching conditions of microwave time 3 min，micro⁃ wave power 400 W，leaching temperature 70 ℃，leaching time 30 min，sulfuric acid concentration 4.0 mol/L and fluorite powder dosage 3%，reaching 97.02% and 50.90%，respectively.On this basis，the mag⁃ nesium ion in the leaching solution is recovered by precipitation method. The pH value of the leaching so⁃ lution is adjusted to 8.5. After heating and stirring at 40 ℃ for 25 min，0.05 g/L non-ionic polyacrylamide is added. After slight stirring，it is allowed to stand for 10 min and filter. The impurities such as iron ions in the crude solution of magnesium sulfate can be removed，and the removal rate is 99.84%.After that， the pH value of the filtrate is adjusted to 11.0 under continuous stirring conditions，and the crude product of Mg（OH）2 is obtained after static aging for 60 min. The purity of Mg（OH）2 reaches 95.73%，which pro⁃ vides a new technical path for the resource utilization of serpentine tailings.
    Flotation Process Test of a Gold Mine in Jiangxi
    LIU Jingang ZHOU Qiangtai WANG Meian
    2026, 42(07):  150-153，158. 
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    In order to improve the gold recovery rate of a low-grade gold mine in Jiangxi Province and realize the efficient enrichment of gold-bearing minerals，the flotation recovery process test is carried out according to the characteristics that gold in the ore mainly occurs in pyrite and arsenopyrite. On the ba⁃ sis of the study of raw ore properties，the flotation conditions such as grinding fineness and the types and dosage of regulators，activators and collectors are systematically optimized，and the open and closed cir⁃ cuit process tests are carried out.The results show that the gold grade of raw ore is 2.01 g/t，and the main gold-bearing minerals are pyrite and arsenopyrite. Under the conditions of grinding fineness of -0.074 mm 75%，sodium carbonate dosage of 600 g/t，copper sulfate dosage of 50 g/t，combined collector isoamyl so⁃ dium xanthate and ammonium dibutyl dithiophosphate total dosage of 150 g/t（mass ratio of 4∶1），2# oil dosage of 22.5 g/t，the gold concentrate with gold grade of 42.12 g/t and gold recovery of 90.59% is ob⁃ tained by using the closed-circuit process of two roughing，two scavenging and two cleaning，and the mid⁃ dle ore returning in sequence. It provides a technical reference for the flotation recovery of similar refracto⁃ ry gold-bearing ore.
    Uncertainty Evaluation in Determination Method of Iron Ore Stowage Factor
    ZHOU Dongdong YUAN Xiaoying
    2026, 42(07):  154-158. 
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    In order to improve the accuracy of iron ore and other bulk mineral products trade and shipping stowage measurement，aiming at the problem of insufficient reliability of measurement results caused by various operation links and complex influencing factors in the determination of iron ore stowage factor by standard measuring box method，according to the technical specification SDLH-WI / JC-104- 2020，the determination of iron ore stowage factor and the evaluation of measurement uncertainty are sys⁃ tematically carried out.The main sources of uncertainty are analyzed and identified by multiple sets of paral⁃ lel tests. Class A is used to evaluate the repeatability of quantitative measurement，and Class B is used to evaluate the volume calibration and mass measurement components of the analysis chamber. The complete quantitative data of uncertainty components are obtained. The combined standard uncertainty of this meth⁃ od is 0.001 236 m3 /t，and the expanded uncertainty is 0.002 m3 /t（k=2）. It is confirmed that the measure⁃ ment repeatability is absolutely dominant in the combined uncertainty.The evaluation method proposed in this study can effectively support the accuracy verification of the measurement results of iron ore stowage factor，and provide practical technical reference and method basis for uncertainty analysis of the subse⁃ quent bulk mineral products stowage factorand quality control.
    Ore Block Identification and Feeding Path Autonomous Switching Design of a Concentrator
    LIU Quanbo LI Chaohui MA Putao
    2026, 42(07):  159-163，168. 
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    In order to solve the problem that the fluctuation of feed particle size affects the processing efficiency of subsequent processes in the process of ore grinding，a system of ore block identification and autonomous switching of feed path is proposed. The hardware composition，communication network，image processing flow，control strategy and implementation method of the system are described.Through the use of six parallel ore-feeding belts and one main belt，the particle size is divided into fine-grained (No.1， No.2)，moderate-grained (No.3，No.4) and coarse-grained (No.5，No.6). The six belts and the main belt are equipped with a block analyzer，combined with the watershed algorithm for image processing and parti⁃ cle size calculation，real-time detection of F80 indicators and block analysis is carried on.The electronic belt scale monitors the processing capacity through the Modbus RTU protocol，and the block analyzer com⁃ municates with the DCS through the OPC protocol. The control system automatically selects the appropriate grade of the ore-feeding belt according to the target processing capacity and F80 data，and adjusts the run⁃ ning speed of the feeder through the PID algorithm to achieve uniform and stable feeding，which can pro⁃ vide an effective solution for the intelligent control of the ore crushing process.
    Study on the Analytical Method of Zircon Grade in Coastal Placer in Hainan Island
    CHEN Songxue,
    2026, 42(07):  164-168. 
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    In order to accurately determine the grade of zircon in coastal placer deposits in Hainan Is⁃ land and support resource evaluation and rational development，aiming at the systematic differences in the principles，processes and results of the two sets of technical systems of heavy sand identification method and chemical analysis method in the current industry，the lack of unified evaluation standards and the problems brought to the actual exploration work，based on the actual work experience of heavy sand miner⁃ al identification and chemical analysis of multiple coastal placer projects in Hainan Island，the analysis path and internal logic of the two core methods are systematically sorted out，the root causes of their differ⁃ ences are deeply analyzed，and the exploration and research of method optimization and joint calibration process are carried out.The results show that the heavy sand identification method is limited by artificial el⁃ utriation，mineral grain size and identification horizon，and its grade result is usually local visual value and representativeness is limited. The chemical analysis method is based on the inversion of the total amount of elements，and the results are closer to the theoretical total value. However，due to the interfer⁃ ence of zirconium and hafnium isomorphism and accessory minerals in zircon，the conversion coefficient is uncertain.By optimizing the chemical conversion formula，introducing automatic mineral analysis technolo⁃ gy，and establishing a multi-method joint calibration process of“heavy sand identification-chemical analy⁃ sis-data verification”，the system deviation between the two methods can be effectively reduced，and the comparability and reliability of grade data can be significantly improved.It is difficult for a single analysis method to take into account both efficiency and accuracy. The establishment of a multi-method collabora⁃tive quality control system is the key to improving the accuracy of the grade determination of coastal zircon placer. This method system can provide an important methodological reference for the accurate exploration and scientific evaluation of similar placer resources.
    Flotation Test of a Low-grade Polymetallic Copper Ore in Xizang
    CI Qu LI Haibin ZHOU Shiqing LI Shuxun GU Huaiwei QU Faqi CIREN Quni CIREN Ouzhu LIU Longshou
    2026, 42(07):  169-173. 
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    The main valuable element copper grade in a polymetallic copper ore in Xizang is 0.425%，and copper is mainly present in chalcopyrite in the form of independent minerals，with a distribu⁃ tion rate of 89.16%. The sulfur grade is 2.78%，mainly in pyrite，and the distribution rate is 84.23%. The associated rare precious metal Au grade is 0.20 g/t，Ag grade is 2.0 g/t. Based on the study of process miner⁃ alogy，the principle process of copper sulfur mixed flotation-regrinding-separation was adopted. In the cop⁃ per-sulfur mixed flotation stage，the combination of C3 and ammonium dibutyl dithiophosphate was used as the collector，and lime was used as the pH value regulator. The copper sulfur mixed concentrate was ob⁃ tained by one roughing，one cleaning and two scavenging. After regrinding the mixed concentrate to 90% of -0.043 mm，copper and sulfur were separated by one roughing，two cleaning and two scavenging with lime as pyrite inhibitor and C3 as copper collector. The copper concentrate with copper grade of 20.228% and re⁃ covery rate of 90.23% can be obtained by closed-circuit test. The associated Ag grade of copper concen⁃ trate is 53.1 g/t，and the associated Au grade is 4 g/t，both reaching the valuation grade，which significant⁃ ly improves the comprehensive value of copper concentrate. The research results is of great significance to promote the scientific development and sustainable utilization of copper resources in this area.
    Analysis of the Influence of Underground Blasting Vibration on the Stability of Adjacent Tailings Reservoir
    DING Chenggong,
    2026, 42(07):  174-178，185. 
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    Taking the underground mining blasting activity of Dayanpeng Copper Mine as the re⁃ search background，the influence of underground mining blasting operation on the stability of adjacent tail⁃ ings reservoir is systematically evaluated by combining Sadaovsk empirical formula with FLAC3D numerical simulation nonlinear dynamic analysis.By analyzing the variation law of key physical quantities such as par⁃ ticle peak vibration velocity and acceleration，the influence of underground blasting vibration on drainage wells，flood discharge tunnels，tailings dams and adjacent villages near tailings reservoirs is comprehen⁃ sively evaluated.The results show that the blasting vibration wave decays exponentially with distance in the range of 40~120 kg，and the peak vibration velocity of each facility is lower than the safety threshold of ‘Blasting Safety Regulations'（GB6722—2014）. The surface acceleration of the adjacent village is also lower than the human comfort limit，and the residents have no significant sense of shock.Therefore，within the scope of the blasting charge，the stability of the surface facilities in the mining area is in a safe and controllable state，which meets the requirements of the specification. The research findings have guiding significance for safe mining operations and tailings dam management.
    Constitutive Improvement and Parameter Sensitivity Analysis of High Temperature Damaged Coarse-grained Marble under Uniaxial Compression
    QIU Yu,
    2026, 42(07):  179-185. 
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    In order to reveal the mechanical degradation mechanism and the whole process deforma⁃ tion response law of coarse-grained marble under high temperature thermal damage，and to improve the de⁃ fect that the traditional rock yield hardening constitutive model cannot characterize the pore compaction stage，the SX2-12-10 high temperature box resistance furnace is used to carry out the gradient high tem⁃ perature heat treatment of coarse-grained marble specimens at 25 ℃，200 ℃，400 ℃ and 600 ℃，and the complete stress-strain curve of rock under different thermal damage degrees is obtained by uniaxial com⁃ pression test. The test results show that with the increase of heat treatment temperature，the thermal dam⁃ age degree of coarse-grained marble increases，the elastic modulus and uniaxial compressive strength de⁃ crease significantly，and the continuous deformation characteristics of pore compaction stage in the initial stage of loading become more obvious. Based on the statistical damage theory of rock and Drucker-Prager strength criterion，the yield hardening constitutive model of foundation is constructed. The Sigmoid func⁃ tion is introduced to add the pore compaction correction term，and an improved constitutive model which can fully describe the four-stage deformation characteristics of rock is established. The fitting results show that the fitting accuracy of the optimized model is significantly improved，and the model parameters change regularly with the evolution of thermal damage. The parameters a，m and b gradually decrease with the in⁃ crease of temperature，and the parameter c gradually increases. Through the parameter sensitivity analysis by the control variable method，it can be seen that the parameters a and m mainly control the curve shape of the yield hardening and strain softening stage of the rock mass，and the parameters b and c accurately control the development rate and critical strain of the pore compaction stage. The optimized constitutive model has a simple form and clear physical meaning of parameters. It can truly reproduce the whole pro⁃ cess of mechanical behavior of pore compaction，linear elasticity，yield hardening and strain softening of high temperature damaged marble，which can provide theoretical reference for the stability analysis of high temperature rock mass engineering.
    Deformation Evolution Law and Collaborative Control Technology of Surrounding Rock in Deep Large Fault Soft Rock Roadway
    WANG Duochun
    2026, 42(07):  186-191. 
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    Aiming at the engineering problems of surrounding rock instability and difficult support when deep high-stress soft rock roadway passes through large faults，taking the deep gas test roadway pass⁃ ing through B4F8 large normal fault project of a mine in Anhui Province as the background，the theoretical analysis，numerical simulation，scheme comparison and field industrial monitoring are comprehensively used to systematically explore the vertical stress evolution and deformation and failure law of surrounding rock in the whole process of roadway excavation near，exposing，crossing and far away from faults. The sur⁃ rounding rock control effects of four schemes of no support，single anchor net cable support，single U�shaped steel frame shed support and U-shaped steel + anchor net cable combined support are compared. The support parameters are optimized，a coordinated surrounding rock control technology suitable for the fault fracture zone is formed，and the reliability of the technology through field engineering applications is verified. The results show that the vertical stress of roadway surrounding rock shows significant stage evolu⁃ tion characteristics due to the barrier effect of fault on stress transfer. Near the fault stage，there is obvious stress concentration in the head and two sides of the hanging wall of the fault. In the stage of exposing and crossing the fault，a large range of stress reduction area is formed in front of the roadway，and the stress of surrounding rock is transferred to the roadway side of the intersection line of the upper plate of the fault. Af⁃ ter far away from the fault，there is still residual stress concentration in the deep rock mass of the fault foot⁃ wall intersection line. The comparison results of various support schemes show that the combined support of U-shaped steel+anchor mesh cable can give full play to the advantages of rigid-flexible cooperative bear⁃ ing，and the constraint effect on the deformation of the roof and floor of the roadway is significantly better than that of the single support scheme. Field monitoring shows that after the collaborative control technolo⁃ gy is adopted，the deformation of surrounding rock gradually converges and stabilizes after about 40 days of roadway support. The overall convergence rate of surrounding rock is less than 5%，and the overall sta⁃ bility of roadway is good，which can provide reference for the control project of surrounding rock crossing fault in deep high-stress soft rock roadway.
    Three-dimensional Geological Modeling and Metallogenic Prediction of Dongyaozhuang Gold De⁃ posit
    JIA Shiying LIANG Niuniu JIA Shijun REN Dalu BAI Yang FENG Zhiqiang, MA Kunyuan XIANG Xuan
    2026, 42(07):  192-198，207. 
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    The contradiction between supply and demand of gold resources in China is significant， and the exploration of deep and concealed ore bodies has become an important way to expand the reserves of gold resources. The metallogenic geological conditions of Dongyaozhuang gold deposit are superior，but the spatial distribution characteristics of ore bodies and the potential of deep prospecting lack systematic re⁃ search，which restricts the advancement of deep exploration in the mining area. Taking Dongyaozhuang gold deposit as the research object，relying on multi-source geological data such as drilling，roadway mea⁃ surement and geophysical prospecting in the mining area，Surpac software is used to construct a high-pre⁃ cision three-dimensional geological model of the mining area，completely restore the three-dimensional spatial morphology of the surface，drilling，roadway，fault and ore body of the mining area，and accurately reveal the spatial occurrence law of ore body strike，tendency，dip angle and inclination. By superimpos⁃ing the apparent polarizability geophysical anomaly information，the spatial matching relationship between the ore body and the geophysical anomaly is analyzed，and the metallogenic characteristics of the known ore body in the mining area and the highly superimposed JD1 high polarizability anomaly area are clarified. Combined with the comprehensive analysis of geological conditions and exploration data，the unclosed high polarizability area in the northeast of JD1 anomaly area is delineated as the preferred metallogenic target ar⁃ ea. The metallogenic geological background of this target area is consistent with the known ore section. The ore-finding rate of deep exploration borehole can reach 88.89 % ，and the deep prospecting potential is huge. The research results have clarified the deep metallogenic regularity and favorable prospecting areas in the mining area，which can provide scientific basis for subsequent drilling verification，resource reserve expansion and deep exploration project deployment in the mining area.
    Application of CSAMT and Microtremor Method Joint Detection Technology in the Exploration of an Iron Mine Goaf
    YANG Kaixuan YANG Haifeng
    2026, 42(07):  199-207. 
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    In order to accurately find out the hidden dangers in the hidden goaf of metal mines and improve the technical basis for mine disaster prevention and control，taking Longqiao Iron Mine as the re⁃ search object，the application of joint detection of controlled source audio magnetotelluric method (CSAMT) and natural source surface wave microtremor exploration is carried out. On the basis of combing the geological and geophysical characteristics of the mining area，the parallel profile observation system is used to synchronously collect resistivity and surface wave signals. The underground electrical structure and shear wave velocity distribution are obtained by data inversion，and the comprehensive interpretation of anomalies is completed by combining geological and borehole data. The results show that the two geophysi⁃ cal methods are highly complementary and the detection accuracy is reliable. In this study，nine goaf-af⁃ fected areas in the early mining section above -370 m are delineated，including six filled goafs and three incompletely filled goafs. The goaf in the mining area shows a typical binary geophysical response law. The filled goaf shows a low-low resistance anomaly，and the incompletely filled goaf shows a low-high resis⁃ tance anomaly. The overlying bedrock of the goaf is generally broken locally，and the mining effect has a continuous disturbance effect on the stability of the surrounding rock. Practice has proved that the com⁃ bined exploration of CSAMT and microtremor can effectively identify the spatial position and filling state of goaf，and form a refined goaf detection technology system suitable for metal mines，which can provide technical reference for disaster management in mining areas and safety exploration of similar mines.
    Study on Ggeological Characteristics and Prospecting Direction of Yangmeigeng Vanadium Deposit in Jiangxi
    OUYANG Xuecai, XU Yuling ZHANG Yuan PENG Bo HUANG Jun LI Qi DENG Youguo
    2026, 42(07):  208-214. 
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    The Yangmeigeng vanadium deposit is located in the depression zone of the middle and lower reaches of the Yangtze River in the southeastern margin of the Yangtze plate，belonging to the Jiul⁃ ing tungsten-molybdenum-copper-tin-gold polymetallic metallogenic subzone. In order to clarify the metallogenic control mechanism and regional prospecting direction of the deposit，this paper is based on the field geological survey of the mining area，the exposed data of the trench and the drilling project，com⁃ bined with the microscopic identification of the rock and ore，the chemical test of the main elements and the full analysis of the trace element spectrum. The geological characteristics，ore body distribution law， ore composition and geochemical characteristics of the deposit were systematically studied. The results show that the vanadium ore bodies in the mining area are strictly controlled by the stratigraphic horizon and all occur in the black rock series of the Lower Cambrian Hetang Formation. The ore bodies are layered and stratoid and are consistent with the stratigraphic occurrence. The average thickness of all ore bodies in the northern ore section is 2.84 ~ 3.32 m and the grade is 0.76 % ~ 0.90 %. The average thickness of all ore bodies in the southern ore section is 4.54 ~ 8.53 m and the grade is 0.75 % ~ 0.90 %. The overall exten⁃ sion is stable. The geochemical characteristics show that the contents of Al2O3，K2O，MgO and P2O5 in the ore are positively correlated，and the vanadium element is significantly positively correlated with redox sen⁃ sitive elements such as Cu，Ni，Zn and Cr. The enrichment degree of vanadium ore is controlled by litho⁃ logic grain size，carbon and phosphorus component content. The fine-grained shale with high carbon and high phosphorus is more conducive to the enrichment of vanadium ore. The ore-forming environment of the deposit is a neritic shelf tidal flat lagoon reducing sedimentary environment，which belongs to the typical black rock series sedimentary vanadium deposit. The adsorption of organic matter and clay minerals is the core ore-controlling mechanism of the initial enrichment of vanadium. The black carbonaceous shale as⁃ semblage of phosphorus-bearing nodules at the bottom of the Cambrian Hetang Formation is the most di⁃ rect prospecting indicator in the mining area. This favorable ore-bearing horizon is widely developed in northern Jiangxi，and the regional vanadium ore prospecting potential is huge.
    Soil Geochemical Characteristics and Prospecting Potential Evaluation of Hebian Area in Shucheng County，Anhui Province
    LI Yongan ZHANG Hui
    2026, 42(07):  215-220. 
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    In order to find out the element geochemical characteristics and prospecting potential of the study area called Hebian in the eastern section of the Wudang-Tongbai-Dabie metallogenic belt，a 1∶10 000 soil geochemical survey is carried out in the study area. Soil samples are collected systematically，and the contents of 11 elements such as Au，Pb，Zn and Mo were determined by chemical spectroscopy and atomic absorption spectrometry. Enrichment coefficient and coefficient of variation were calculated after eliminating outlier data by iteration，and the symbiotic combination rules of elements are clarified by corre⁃ lation analysis and factor analysis. The mean plus double standard deviation is used to determine the lower limit of the anomaly and delineate the geochemical comprehensive anomaly，and the key anomaly is select⁃ ed to carry out the verification of the trenching project. The results show that Pb and Au in the area are strongly enriched，Zn and Mo are relatively enriched elements，Cu，Pb and Mo have significant spatial dif⁃ ferentiation，and Mo and Pb have the best metallogenic potential. Four groups of main factors are extracted by factor analysis. Pb-Zn-Mo，Cu-Ag-Bi and other element combinations correspond to medium-high tem⁃ perature and low temperature multi-stage hydrothermal mineralization，respectively. A total of 9 compre⁃ hensive anomalies have been delineated in the whole area. The AP8 anomaly has a large scale，high peak in⁃ tensity and complete element combination，which is the primary prospecting target area in the area. The trenching project revealed a number of lead and molybdenum mineralization bodies in the anomaly，and the mineralization development is closely related to wall rock alteration such as silicification and pyritization. The geochemical anomaly is formed by lead-molybdenum polymetallic mineralization，and the soil geo⁃ chemical survey can effectively identify the concealed mineralization information in the shallow coverage ar⁃ ea. The study area has a good prospect for lead-molybdenum polymetallic prospecting.
    Research on Precise Installation Technology of Driving Head and Central Pillar of High Efficiency Thickener in Yuanjiacun Iron Mine
    ZHOU Jinhua
    2026, 42(07):  221-226. 
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    In order to solve the problems of lack of installation reference，insufficient positioning ac⁃ curacy，backward detection methods，poor process standardization，long installation cycle，high rework rate and insufficient operation stability in the traditional installation process of high-efficiency thickener in Yuanjiacun Iron Mine，the precise installation technology of high-efficiency thickener drive head and cen⁃ tral pillar is studied to adapt to the complex topographic and geological conditions，harsh climatic environ⁃ ment and high reliability beneficiation process operation requirements of the mine.Based on the technical core of benchmark unification，detection precision，adjustment standardization and process closed-loop， the whole process precise installation system of theodolite rapid positioning，two-way verticality calibration of central pillar，positioning and installation of underflow cone，four-way horizontality regulation of driving head，coaxiality detection of driving head and central pillar vertical method，fine adjustment of verticality and clearance of driving cage is constructed. The system eliminates the superposition effect of component processing error and field installation error，and realizes the high-precision，high-efficiency and high-sta⁃ bility installation of core bearing and transmission components of high-efficiency thickener.The engineer⁃ ing application results show that the technology can control the verticality deviation of the central pillar within 1 mm，the horizontality of the drive head installation within ± 1 mm，the coaxiality between the drive head and the central pillar within 2 mm，and the gap between the drive cage slider and the central pillar within 5 mm. The total installation period of single equipment is reduced from 324 h to 108 h，the construction efficiency is greatly improved，the resource consumption is significantly reduced，and the comprehensive benefit of the project is obviously optimized.After the equipment is put into use，the opera⁃ tion is stable，the mud scraping is smooth，and the concentration and separation index is stable. It can pro⁃ vide key equipment technical support for the continuous and stable operation of the ore dressing system and the efficient release of production capacity in Yuanjiacun Iron Mine. The precise installation process fills the gap in the standardized and precise installation technology of high-efficiency thickeners in large metallurgical mines in China，and has the value of popularization and application.
    Application and Key Technology Research of Inflatable Membrane Structure in a Copper Concen⁃ trate Mixed Ore Project in Hainan
    HUANG Xiaoyang YANG Mingchuan HUANG Dong,
    2026, 42(07):  227-230，251. 
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    In order to solve the problems that the traditional large-span steel structure workshop and skeleton membrane structure workshop in the storage facilities of non-ferrous metal industry are difficult to completely eliminate dust emission and the construction period is long，taking a copper concentrate mixed ore project in Hainan as an example，the inflatable membrane structure is applied to the distribution center of the project，and the key problems such as its anti-typhoon ability，internal environmental control sys⁃ tem，safety control of logistics and human flow，intelligent monitoring and operation and maintenance are studied.The research results show that the inflatable membrane structure has excellent anti-typhoon perfor⁃ mance and environmental protection tightness，and the construction period is short，the comprehensive cost is low，and the applicability is strong. It can provide an ideal solution for the environmental protection storage and clean production of raw materials and products in the non-ferrous metal industry.
    Development and Application of Mine Inclination Sensor Based on MEMS Technology
    JIN Fengtian ZHANG Daixiang ZHENG Can WANG Yang ZHAO Guangyuan ZHANG Guohua
    2026, 42(07):  231-234. 
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    In order to solve the problems of large volume，low precision and weak anti-atrocious en⁃ vironment ability of traditional mine inclination sensor，a mine intrinsically safe inclination sensor is devel⁃ oped based on micro-electro-mechanical system（MEMS）technology.The design adopts a four-layer inte⁃ grated structure of“explosion-proof enclosure-sensitive unit-signal processing-communication power sup⁃ ply”. The high stability MEMS accelerometer is selected as the core sensitive element. Based on the princi⁃ ple of gravity field component decomposition，the inclination calculation model is derived，and the temper⁃ ature compensation algorithm is introduced to suppress the drift of MEMS devices.After completing the hardware selection and software development of the prototype，the performance of the prototype is verified by accuracy calibration，anti-vibration and explosion-proof performance tests.The application results of at⁃ titude monitoring of hydraulic support in 4703 working face of Yangcun Coal Mine show that the static measurement accuracy of the sensor in the laboratory is ±0.01°，the error of underground field application is ≤0.22°，the measurement range is ±60°，and the protection level is IP68，which meets the needs of un⁃ derground field use.
    Application of Green Mine Construction and Sustainable Development Model in Haikou Phosphate Mine
    CHENG Yuyin, XIANG Li LIU Dongpo
    2026, 42(07):  235-239. 
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    In order to achieve the coordinated goal of high-quality development of mining industry and ecological environment protection，aiming at the systematic problems faced by large open-pit phos⁃ phate mines in green transformation，a systematic case study is carried out in Haikou Phosphate Mine of a national green mine，Yunnan Phosphate Haikou Co.，Ltd.，through the analysis of the mine’s 2024 annual self-assessment report and long-term practical experience，from the six dimensions of mining area environ⁃ ment，resource development，comprehensive utilization，energy conservation and emission reduction，sci⁃ entific and technological innovation，and enterprise-land harmony，this paper summarizes the specific practices and key data of“mining while controlling”ecological restoration，efficient utilization of medium and low-grade resources，and intelligent management of the whole process.The results show that the mine has successfully constructed a planning-technology-collaborative sustainable development model charac⁃ terized by high-standard planning as the guide，scientific and technological innovationas the core drive， and resource-environment-community collaborative development.In 2024，the total self-assessment score of green mine construction in Haikou Phosphate Mine is 937 points，the scoring rate of resource develop⁃ ment mode is as high as 97.9%，and the full score of energy saving and emission reduction is obtained. It provides a systematic solution and implementation path for the green，low-carbon and intelligent transfor⁃ mation of similar large open-pit mines，especially the phosphate industry.
    Analysis of Soil Physicochemical Properties and Microbial Community Characteristics of Mine Solid Waste
    YANG Bingyang PEI Dejian, HUA Shaoguang, LI Shuqin, WANG Conglin ZHENG Yi ZHAI Bingyan
    2026, 42(07):  240-244. 
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    In order to explore the feasibility of iron tailings and other mine solid waste partially re⁃ placing soil for ecological restoration，the physical and chemical properties，nutritional components， heavy metal content and microbial population structure of iron tailings，stope weathered soil and stope dust removal ash are systematically analyzed.The results show that the solid waste such as iron tailings is not corrosive，and the iron oxides such as magnetite contained in it can slowly release trace elements such as iron and magnesium after activation，and improve the physical structure of the soil，which has potential soil improvement value. Although some nutritional indexes did not meet the standard，they could be im⁃ proved by compound supplementation，and the content of heavy metals could also meet the standard re⁃ quirements by blending.The microbial community structure and functional bacteria composition of the reme⁃ diation matrix are highly consistent with those of the original soil by mixing the nearby original soil with iron tailings for ecological restoration. Due to the low microbial diversity，the stope weathered soil and stope dust removal ash need to be limitedly mixed in the application.The soil reconstruction of iron tailings and other mine solid wastes is feasible，which can provide technical support and experimental basis for iron tailings and other mine solid wastes as ecological restoration substrates to replace part of the soil.
    Evaluation of Geological Environment Protection Technology in Mining Area Based on Combina⁃ tion Weighting-Fuzzy Comprehensive Evaluation
    SHAO Yinquan YANG Hao MAO Longmin WEN Peng
    2026, 42(07):  245-251. 
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    High-intensity mining of coal resources is easy to induce typical geological disasters such as surface subsidence and ground fissures，which seriously damages the ecological environment of the min⁃ ing area and restricts the green and sustainable development of the mine. At present，there are obvious un⁃ certainties and nonlinear problems in the evaluation system of coal mine geological environment protection technology. A single evaluation method cannot take into account both subjective experience and objective data，and the evaluation results are one-sided and limited in credibility. In order to realize the scientific and quantitative optimization of mining area governance technology，this paper combines analytic hierar⁃ chy process and entropy weight method to construct a combination weighting system with subjective and ob⁃ jective coupling，which effectively makes up for the application defects of single weighting method. Based on the fuzzy mathematics theory to deal with the fuzzy interference factors in the evaluation process，a com⁃ bination weighting-fuzzy comprehensive evaluation model including three first-level indicators of technolo⁃ gy，environment and benefit and 14 second-level indicators is established. Taking the geological environ⁃ ment restoration project of Xinzhuang Coal Mine as an example，the comprehensive application effects of three mainstream treatment technologies，such as deep excavation and shallow cushion，coal gangue back⁃ filling and land leveling，are systematically compared. The measured evaluation results show that the scores of the three types of treatment schemes are 8.465 6，5.742 7 and 6.568 8 respectively，and the com⁃prehensive advantages of the deep excavation and shallow cushion scheme are the most significant. The evaluation logic of the model is rigorous and the results are in line with the engineering practice，which can provide reliable quantitative technical support for the optimization and selection of geological environ⁃ ment treatment schemes and ecological restoration in similar coal mining areas.
    Study on Space-Time Strong Advance Prediction Method of Microseismic Risk Field in Coal Mine
    YUAN Tengfei KONG Zhen YUAN Peixuan ZHANG Hangrui SHEN Zhenqiang
    2026, 42(07):  252-258. 
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    The mining disturbance of coal mine is easy to induce the dynamic disaster of rock burst， and its evolution process is accompanied by obvious microseismic response. It is the key to the safe mining of deep coal mine to accurately predict the temporal and spatial evolution law of microseismic risk and real⁃ ize the early warning of disaster. Machine learning can effectively mine the characteristics of microseismic monitoring data，capture the law of time series evolution，and provide technical support for the identifica⁃ tion of rock burst precursors. Aiming at the problems of weak spatial continuity of discrete microseismic scatter points，difficulty in accurately characterizing the evolution characteristics of risk field，and insuffi⁃ cient generalization ability of the model，this paper proposes a time-space strong advance prediction meth⁃ od of microseismic risk field that combines data enhancement and deep learning. This method uses a two�dimensional Gaussian interpolation algorithm，sets a 64×64 grid resolution and a time-series sliding win⁃ dow with a capacity of 5，and reconstructs a discrete microseismic sequence into a continuous microseis⁃ mic risk field image frame of the working face. The data enhancement is completed by 0.9 inter-frame simi⁃ larity threshold，which optimizes the sample quality and improves the convergence efficiency of model training. Based on the ConvLSTM network，the spatial and temporal dependence characteristics of the risk field are mined to realize the dynamic advance prediction of the microseismic risk field. Based on the mea⁃ sured microseismic data of 6439 groups of 7303 working face and 4084 groups of 7304 working face in Zha⁃olou Coal Mine，a comparative test was carried out. The 5×5 sliding window peak extraction method was used to invert the daily microseismic maximum energy，average energy and event frequency index and com⁃ plete the quantitative analysis. The experimental results show that the method can accurately construct and predict the temporal and spatial evolution law of microseismic risk field，with low prediction error and good fitting effect. It shows stable prediction performance and excellent generalization ability in different working faces. The research results can provide new ideas for the dynamic classification and early warning of mine rock burst，and provide technical reference for the prevention and control of similar mine dynamic disas⁃ ters.
    Experimental Study on High Pressure Water Injection on Anti-Impact and Disaster Reduction in Near Vertical Extra-thick Coal Seam
    FU Genning LI Bo
    2026, 42(07):  259-264. 
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    Taking the +425 m horizontal working face of B3-6 coal seam in Wudong Coal Mine as the engineering background，combined with indoor coal moisture content mechanics test，numerical simu⁃ lation and on-site microseismic monitoring methods，coal seam water injection on pressure relief and rock burst prevention is systematically studied. The results show that the main stress concentration areas are the upper and lower parts of the roadway，the end of the working face and the lower part of the goaf after the mining of the near-vertical coal seam. When the pressure relief measures are not taken，the maximum hori⁃ zontal stress peak of the roadway is 35 MPa，and the vertical stress peak is 20 MPa，and the impact risk is high. After the implementation of coal seam water injection，the mechanical properties of coal body are weakened，the stress of surrounding rock is effectively released，the peak value of vertical stress is re⁃ duced by 5 MPa，the stress concentration coefficient is significantly reduced，and the shallow concentrat⁃ ed stress is transferred to the deep part of coal body. Field monitoring shows that coal seam water injection can increase the frequency of microseismic events，reduce vibration energy，reduce high-level vibration events，and achieve progressive release of elastic energy of coal and rock mass. The study confirmed that the coal seam water injection can effectively weaken the stress concentration of the surrounding rock of the nearvertical extra-thick coal seam，optimize the energy release law，and significantly reduce the risk of rock burst，which can provide reference for the prevention and control of rock burst disasters in similar mines.
    Optimization Research and Application of Filling and Roof Contact Scheme for First-step Mining Chamber with Large-diameter Deep-hole
    WANG Qinggang, GU Zhangheng, ZHANG Suna, WANG Peipei, YU Xingshe, YANG Zhiqiang,
    2026, 42(07):  265-268. 
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    Improving the filling and roof contact effect of mining chamber first-step is of great signifi⁃ cance for ensuring the safe mining of the second-step mining chamber. In response to the problems such as large size of the void area in the high-stage large-diameter deep-hole mining area of Zhongguan Iron Mine and poor filling and roof contact effect，a filling slurry flow model of the mining area was constructed. Com⁃ bined with production practice，the settlement mechanism of the filling slurry in the void area was ana⁃ lyzed. It was found that when a single point was discharged and the filling slurry flowed over a long dis⁃ tance，in the void area，it often accumulated into a filling slope centered on the discharge port，with a higher middle part and lower periphery. Based on this，a secondary roof contacted technology scheme of segmented filling+"filling+grouting" was proposed. One is to optimize the single-point discharge to multi⁃ ple-point discharge; the other is to divide the top void area of the mining chamber into two sections for fill⁃ ing，reducing the void area between the filling body and the roof caused by uneven slurry flow. Finally，the "filling + grouting" method was adopted to conduct pressure grouting to fill the un-contacted void area. Through engineering practice，the optimized filling and roof contacted scheme has shown good results， with a roof contacted rate of over 92%，and can be further promoted and applied.