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Exploration on Supervision Methods and Paths of Mineral Resources Development in Zhejiang Province SHI Lei , HAN Shuai , ZHANG Ying, LIU Yi , ZHAN Long, ZENG Yong Modern Mining    2023, 39 (04): 1-.   Abstract （175）      PDF（pc） （3838KB）（264）       Knowledge map    Save In 2021，the National Natural Resources Supervision Agency carried out mineral resources supervision for key provinces within its jurisdiction for the first time. In this paper，the relevant inspection process and method path are established for the three key contents of the approval and registration of mining rights and the comprehensive promotion of competitive assignment，the order of development and utilization of mineral resources，and the implementation of ecological restoration of abandoned open-pit mines.At the same time，on the basis of provincial research and judgment，key cities were selected for on-site inspection to test and improve the method path，and put forward relevant suggestions on the technical difficulties. This study can provide reference for mineral resources supervision in other cities. Related Articles | Metrics

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Analysis of the Influence of Geological Structure on Mining Activities in Luohe Iron Mine HE Xiaowen Modern Mining    2023, 39 (04): 11-.   Abstract （104）      PDF（pc） （2707KB）（179）       Knowledge map    Save In order to efficiently develop mineral resources and ensure mine infrastructure and pro⁃ duction safety，through the analysis and study of the regional geological structure of Luohe Iron Mine，the morphological characteristics of folds and faults in the strata of the mining area are summarized，and the in⁃ fluence of mine geological structure on engineering geology and hydrogeology is analyzed，so as to provide basis for mining engineering design. The tectonic deformation is mainly Yanshanian orogenic movement. The development time of geological structure is F1 series，F3/F4 series，F2 series and fold from early to late，the basement uplift is later than the basement fault. F1 series faults are the main ore-controlling struc⁃ tures，and other faults and folds are formed later than ore bodies. F2 series fracture is the main water chan⁃ nel. The Z1 and Z2 series folds control the fluctuation of the roof and floor of the ore body and affect the sta⁃ bility of the ore rock. The original fracture of parent rock is beneficial to alteration mineralization. Related Articles | Metrics

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Risk Management and Control of Overseas Ore Procurement for a Copper-cobalt Ore Processing Enterprise ZHANG Shuchen, GAO Bangfei, ZHANG Leilei , YAO Gang, CHEN Weikang Modern Mining    2023, 39 (04): 7-.   Abstract （92）      PDF（pc） （2121KB）（178）       Knowledge map    Save For those companies who purchase ores from overseas mines for processing，it is easy to cause economic losses with poor management due to negative factors such as long ores procurement process， many factors involved，difficulties of management，poor economy and so on. In order to provide guidance for similar companies in risks preventing，taking a company that purchases copper-cobalt ores from overseas mines to produce copper-cobalt concentrate as an example，the experience of effectively preventing and con⁃ trolling the risks of ores procurement by improving management system，clarifying the division of responsi⁃ bilities，implementing separate pile management，verifying sampling and strict internal control management is introduced. Related Articles | Metrics

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Analysis of Ore-controlling Regularity of Strata in Dahongshan Iron-copper Deposit， Xinping County，Yunnan Province YANG Xinghua Modern Mining    2023, 39 (04): 17-.   Abstract （118）      PDF（pc） （1766KB）（168）       Knowledge map    Save In order to further clarify the formation mechanism of Dahongshan iron-copper deposit，the previous related results and the geological work results of this deposit are comprehensively analyzed. The analysis shows that: ①The genesis of Dahongshan iron-copper deposit belongs to submarine volcanic erup⁃ tion-transport deposition-metamorphic transformation deposit，which is strictly controlled by stratigraphic lithology，but its metallogenic form is quite different from that of ′in-situ deposition′ deposit near volcanic edifice. ②The Manganghe Formation and Hongshan Formation of Dahongshan Group in the mining area have significant metallogenic specificity. ③Manganghe period volcanic mineralization and Hongshan period volcanic mineralization are two different volcanic metallogenic systems. The Manganghe period is dominated by volcanic exhalation，and the ore-bearing lithology is a local geological unit controlled by volcanic institu⁃ tions. ′Dahongshan′ iron ore is produced inside and near the volcanic structure. The Hongshan period is dominated by central volcanic overflow，and the mineralization is strictly controlled by the intensity of volca⁃ nic activity and sedimentary environment. Related Articles | Metrics

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Study on the Width of Isolated Pillar under the Lateral Pressure of Caving Rock TAN Fusheng Modern Mining    2023, 39 (04): 39-.   Abstract （92）      PDF（pc） （2598KB）（146）       Knowledge map    Save In order to determine the width of the isolated pillar under the lateral pressure of the caving rock，FLAC3D was used to simulate the stability of five different widths of isolated pillars.Under the action of lateral pressure，there is obvious stress concentration at the bottom of the isolated pillar，and the tensile stress and horizontal displacement on the side of the goaf are significantly greater than those of the twostep pillar.The stress and horizontal displacement of the isolated pillar decrease with the increase of the width，and the critical width to ensure the stability of the isolated pillar is 15 m.Considering the influence of geological factors and blasting vibration，it is recommended that the width of isolated pillar should be 20 m. Related Articles | Metrics

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Study on Metallogenic Geological Characteristics and Metallogenic Potential of Longtiangou Man⁃ ganese Deposit WEI Jun Modern Mining    2023, 39 (04): 26-.   Abstract （60）      PDF（pc） （1865KB）（136）       Knowledge map    Save The Longtiangou manganese deposit in Lingshou County，Hebei Province has only sparse work on Mn2，Mn3 and Mn5 mineralized bodies，and the direction and depth of the mineralized bodies are unclear. This paper focuses on the geological conditions of Mn2，Mn3 and Mn5 mineralization bodies，and evaluates the metallogenic potential of manganese deposits in this area. There are four mineralized bodies in the Longtiangou manganese deposit，which occur in the Paleoproterozoic Linshan Formation and the Qing⁃ tong Formation. They are layered，lenticular，and angular，which are basically consistent with the occur⁃ rence of surrounding rocks. Mn1，Mn2，Mn3 mineralization bodies have small scale and high grade. The Mn5 mineralization zone is large in scale and low in grade. The analysis shows that the deposit is small and the metallogenic potential is not good. At the same time，it is considered that the prospecting prospect of this type of manganese deposit is not good. Related Articles | Metrics

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Analysis of Geological Structure Characteristics and Formation Mechanism of Longtan Gold Deposit in Southern Jiangxi WANG Lei Modern Mining    2023, 39 (04): 30-.   Abstract （54）      PDF（pc） （1857KB）（133）       Knowledge map    Save The spatial occurrence state of gold ore body in Longtan mining area is mainly controlled by SN direction fracture-fault system in the area. Through the analysis of the fracture-fault interspersed cutting relationship in the mining area，it is considered that the SN direction fracture-fault in the area is two groups of X-type torsional fractures with small intersection angle and nearly SN direction associated with the Cale⁃ donian cycle Chengongpai inverted anticline. Under the action of the NE-NNE direction tectonic stress in the Yanshan period，the X-type torsional fractures further expand and penetrate，becoming the ore-bearing structure of the mining area. The EW direction faults in the area were formed in the early Yanshan period and alternately developed with NE-NNE direction faults，mainly pre-mineralization faults. The late Yansha⁃ nian mineralization ended，showing strong fault activity，generating a series of NE-NNE and EW direction destructive fault structures.The fracture-fault structure in the area is characteried by multi-stage，compres⁃ sion-torsion-tension-torsion. Related Articles | Metrics

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Research on the Application of HPGR in a Copper Concentrator in Jiangxi LIU Chang, LU Chen Modern Mining    2023, 39 (04): 96-.   Abstract （56）      PDF（pc） （2278KB）（128）       Knowledge map    Save With the extension of mining depth in a copper mine in Jiangxi，the grindability of the ores decrease，which directly affects the production capacity and product index of the concentrator. In order to eliminate these negative effects as much as possible，combined with the actual situation of concentrator，the HPGR test and ball grinding work indexes tests were carried out，and compared HPGR open-circuit scheme with leftover return scheme in terms of process，equipment layout and operation cost. The results showed that the HPGR process is suitable for the concentrator. Compared with open-circuit scheme，leftover return scheme has obvious advantages in reducing the number of system equipment and reducing the operating cost of grinding system，which is the preferred transformation scheme for HPGR in concentrator. Related Articles | Metrics

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Analysis of Metallogenic Potential of Sandstone-type Uranium Deposits in Zhaosu Basin，Xinjiang QIU Yubo, ZHANG Lei, HAO Yize Modern Mining    2023, 39 (04): 21-.   Abstract （67）      PDF（pc） （1903KB）（119）       Knowledge map    Save The metallogenic potential of sandstone-type uranium deposits in Zhaosu Basin is analyzed to provide a reserve mineral base for Yili Basin. Based on the geological survey of uranium deposits in Zhao⁃ su Basin in recent years，the ore-controlling factors of sandstone-type uranium deposits such as structure， lithology，lithofacies and interlayer oxidation zone are studied，and the metallogenic conditions of sand⁃ stone-type uranium deposits in Zhaosu Basin are analyzed and evaluated. The research shows that the tec⁃ tonic activity of Zhaosu Basin is strong，but there is a relatively stable area in the tectonic activity area， which has the metallogenic conditions of forming interlayer oxidation zone sandstone type uranium deposit. The Jurassic ore-bearing formation is widely developed and distributed in the northern depression zone of the basin to the north of the Adentao Mountain. The Jurassic Xishanyao Formation and Toutunhe Formation sand bodies and interlayer oxidation zones are more developed，and uranium mineralization or uranium anomalies such as Qiulakemeisi are found. The sand body，interlayer oxidation zone and uranium mineraliza⁃ tion are developed in the northern side of the Adentao Mountain and the piedmont area of the northern Wu⁃ zongbulake，and the burial depth is relatively shallow，which can be used as the preferred area for the next exploration and evaluation work. Related Articles | Metrics

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Study on Consolidation Treatment of Deep Soft Foundation in Dump of Open-pit Mine ZHAO Mengsheng, XU Wenhan, LI Boyi, WANG Heng Modern Mining    2023, 39 (04): 73-.   Abstract （45）      PDF（pc） （2255KB）（115）       Knowledge map    Save The reinforcement of deep soft soil foundation is of great significance to the stability of dump slope. Based on the consolidation theory of sand well，the consolidation of deep soft foundation in a dump is studied. The consolidation degree of deep soft foundation under different time and different loading thickness is analyzed. The depth and spacing of vertical drainage system are determined，and the preloading time and layered height of deep soft foundation are optimized. The results show that the average consolida⁃ tion degree under surcharge preloading increases logarithmically with time，while the shear strength of the foundation increases exponentially with the increase of consolidation degree. The stability of the reinforced dump is analyzed by GeoStudio，and the safety factor of the dump is 1.190，which meets the safety requirements. The research results can provide technical support for the drainage consolidation treatment project of deep soft foundation in dump. Related Articles | Metrics

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Study on Long-term Stability of Underground Mining in an Anhydrite Mine LIU Hailin, LI Hongfei, LI Pengcheng, TANG Zhengxin, CHEN Yi Modern Mining    2023, 39 (04): 43-.   Abstract （56）      PDF（pc） （3112KB）（114）       Knowledge map    Save In order to study the long-term stability of an anhydrite mine，the whole process of mining is numerically simulated and analyzed by constructing a mining model and using Burgers creep constitutive model. The results show that as the duration of the goaf becomes longer，the horizontal displacement difference and vertical displacement of the goaf in each middle section become larger and larger，the increase range gradually decreases，and the deformation of the surrounding rock tends to be stable. The maximum principal stress value of gypsum mine within 100 years after simulated mining is 21.7 MPa，the maximum vertical displacement of surrounding rock is 35~40 mm，the maximum horizontal displacement in Y direction is 36 mm，and the maximum horizontal displacement in X direction is 26 mm，which are all within the allowable strength and deformation range. The long-term stability of the surrounding rock of the gypsum mine is good，which provides a reference case for the long-term stability analysis of similar gypsum mines. Related Articles | Metrics

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Comprehensive Room-pillar Mining and Process Optimization of Gently Inclined Thin Ore Body in Chang'an Gold Mine LIU Yongwen, ZHOU Zonghong, ZHANG Junyang, HE Hong, YANG Shidong Modern Mining    2023, 39 (04): 47-.   Abstract （58）      PDF（pc） （1643KB）（109）       Knowledge map    Save The ore bodies below 1 500 m in Chang′an ore section are slightly inclined-inclined，extremely thin-medium thick ore bodies，with complex occurrence forms and complex mining conditions. According to the geological conditions of the deposit and the economic conditions of mining technology，an improved comprehensive room-pillar method is proposed by combining the advantages of the comprehensive method and the room-pillar method. Based on the results of rock mass quality classification，the empirical formula is used to calculate and analyze the structural parameters of the stope. The reasonable stope span is 8.5~12.5 m，the roof exposure area is 700 m2，the column diameter is 3 m，and the spacing is 6~7 m. The scheme has received good application results and can be used as a reference for similar mines. Related Articles | Metrics

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Engineering Geological Exploration of a Tunnel Based on Audio Magnetotelluric Sounding Method LU Xia, TANG Yuxin, WANG Chaojin, WANG Guanghui, YAN Xue Modern Mining    2023, 39 (04): 33-.   Abstract （51）      PDF（pc） （2253KB）（106）       Knowledge map    Save The economical and efficient audio magnetotelluric sounding method is used to detect the central axis of the tunnel，and then the data are processed by SSMT2000，MTsoft2D and other software. Finally，the electrical structure characteristics of the study area are analyzed by the inverted apparent resistivity profile，so as to speculate the geological structure characteristics，water-rich conditions and spatial distribution of unfavorable geological bodies. Audio magnetotelluric sounding method is sensitive to low-resis⁃ tance anomalies in high-resistance geological bodies in the study area. Low-resistance areas are mostly weak strata such as water-bearing faults or karst caves. Such unfavorable geological bodies are the main targets for research and are of great significance to the development of the project. Related Articles | Metrics

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Precision Optimization of Laser Scanning Mapping System in Mine Surveying QING Xianhua Modern Mining    2023, 39 (04): 36-.   Abstract （61）      PDF（pc） （1700KB）（104）       Knowledge map    Save Aiming at the shortcomings of complex surveying and mapping process，low surveying and mapping efficiency and poor accuracy of laser scanning surveying and mapping system in mine surveying， the optimization measures are put forward by analyzing the principle of the problem. The optimization of laser scanning mapping accuracy is realized by using attitude dynamic compensation based on double inclination sensor，high precision correction of external coordinates based on flexible target and high precision measurement system of absolute angle. The practical application shows that the scheme can improve the surveying and mapping efficiency by 74.6 % and make the surveying and mapping accuracy reach 97.6 %. Related Articles | Metrics

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Influence of A Hematite Concentrate Proportion on Pellet Production HUANG Xicong , ZHOU Feng Modern Mining    2023, 39 (04): 89-.   Abstract （45）      PDF（pc） （1897KB）（103）       Knowledge map    Save Based on the actual pellet production process of Ezhou Pellet Co.，Ltd.，the influence of hematite concentrate proportion on pellet production process was studied. The results showed that the proportion of hematite concentrate has an important effect on the temperature and pressure of grate，rotary kiln and ring cooler，as well as the yield and quality of product. When the proportion of hematite concentrate is 40%， temperature in the rotary kiln head and furnace cover of ring cooler both are the lowest. Also，the PH section of the grate has the lowest negative pressure，the output of pellet production can reach 630 t/h，and the average compressive strength is 2 687 N/piece. With the increase of the proportion of hematite concentrate，the consumption of coal gradually increased. When the proportion of hematite concentrate is greater than 40%， the system has a remarkable reheating effect，which is more conducive to saving fuel consumption. Related Articles | Metrics

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Stress Distribution and Microseismic Activity Law of Island Filling Working Face in Yunhe Coal Mine LI Peng, SONG Jiefang Modern Mining    2023, 39 (04): 50-.   Abstract （45）      PDF（pc） （2889KB）（98）       Knowledge map    Save The advanced abutment pressure of the working face is complicated due to the control of the subsidence of the overlying strata of the roof，and the roof breaking form is also different from the conventional island working face. In order to better control the surrounding rock of the island filling working face，taking the C8301 working face of Yunhe Coal Mine as the background，the change trend of the advance abutment pressure and the deformation of the coal pillar are studied，and the microseismic activity law during the mining process of the working face is also analyzed. The results show that : ①The first weighting step of the island filling working face increases obviously，and the first weighting occurs when the working face advances to about 120 m. ②The overall deformation of coal pillars on both sides of the island filling face is small，which can maintain the relative stability of coal pillars. ③In the mining process of island filling working face，there are obvious characteristics of pressure，but the pressure intensity is much smaller than that of normal island working face. This study provides guidance for the safe mining of deep island filling working face. Related Articles | Metrics

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A Process Design for Improving the Recovery Effect of Cassiterite from a Tin Polymetallic Ore HU Hui , ZHANG Zhengjun Modern Mining    2023, 39 (04): 119-.   Abstract （57）      PDF（pc） （1909KB）（98）       Knowledge map    Save Changsha Non-ferrous Metallurgical Design and Research Institute Co.，Ltd.） Abstract The mineral composition of a tin polymetallic ore in Hunan Province is complex，among which the main valuable metallic minerals are cassiterite，galena，brittle antimonite，chalcopyrite and sphalerite，and the main gangue minerals are quartz，topaz，feldspar，mica and chlorite. The cassiterite in the ore is distributed unevenly and easy to be crushed in the grinding process. In order to improve the recovery effect of cassiterite，in the new system，the SnO2 beneficiation process was optimized based on the test results and the original production process. High frequency fine screen was used as classification equipment to reduce the overcrushing of cassiterite. The classification-gravity separation technology was introduced to improve the separation of cassiterite by shaking. For the microfine cassiterite which was difficult to be recovered by gravity separation，the tin concentrate with Sn grade of 55% and recovery rate of 68.4% was obtained by flotation-centrifuge separator cleaning process after desliming. The production indexes and economic benefits by the new process are better than those by the original process. Related Articles | Metrics

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Present Situation and Consideration of Green Mine Construction in Inner Mongolia ZHAO Lijuan, YE Zhengyu, WU Huizhen, YANG Yabo, ZHANG Meng, WANG Peidong Modern Mining    2023, 39 (04): 148-.   Abstract （54）      PDF（pc） （1776KB）（95）       Knowledge map    Save Mineral resources in Inner Mongolia is rich. With the release of the national opinions on accelerating the construction of ecological civilization in 2015，the construction of green mines has become a general trend of moderate exploitation of mineral resources. Green mine construction is of great significance to realize the transformation and upgrading of Inner Mongolia mining industry，promote the economic development in the whole region，and build the important ecological security barrier in the north. Based on this， the construction process，achievements and main problems of green mine in Inner Mongolia were analyzed and summarized. And then suggestions from the aspects of green mine construction of sand and gravel soil and small non-metallic mines，green mining demonstration area construction，green mine construction support policy，green mine construction publicity and so on were put forward combined with the actual situation in Inner Mongolia，so as to provide reference for green mine construction management，green mine builders and related researchers in Inner Mongolia. Related Articles | Metrics

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Modern Mining    2023, 39 (04): 258-.   Abstract （38）      PDF（pc） （714KB）（94）       Knowledge map    Save Related Articles | Metrics

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Intelligent Control Method in the Classification Process of Tower Mill and Its Application ZHANG Wei, ZHANG Qiang, WANG Lingxiao, LIU Jiang, ZHANG Junfei Modern Mining    2023, 39 (04): 135-.   Abstract （57）      PDF（pc） （3172KB）（91）       Knowledge map    Save The grinding process is an operation process with high production cost in the concentrator. Its intelligent control has the characteristics of nonlinearity，multiple variables and strong coupling. In order to realize the intelligent control of grinding process，the following methods are proposed for the control objectives and control difficulties of tower grinding classification process. The data-driven model-free adaptive control method has the characteristics of strong robustness，few parameters，and is suitable for the design of control loops in industrial sites. The feed concentration and feed pressure of hydrocyclones are divided into two simple control loops. Based on model-free adaptive control，two single-loop controllers for tower mill classification process control are designed，achieving the goal of accurate control of feed concentration and feed pressure. Related Articles | Metrics