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Acta Geologica Sinica(English Edition) 2018年第6期92卷 2451-2453页

作者： JIAN Runtang kunming Prospecting design institute of china nonferrous metals industry co. Ltd.

Object The Eastern Kunlun Orogen(EKO), An important part of the Tethyan orogenic belt in the northern margin of the Qinghai–Tibet Plateau(Li et al., 2014; Ren Haidong et al., 2016), is a key area for geological research and mineral exploration(Li Bile et al., 2015). The Qimantag Mountain is located in middle segment of the EKO, which has experienced the Early Paleozoic and Late Paleozoic–Early

关键词： Pb New Zircon U-Pb Age of Devonian Granites in the Niukutou Lead-Zinc Deposit Qinghai Province and its Significance for Prospecting Blind Orebodies

Trace element compositions of pyrite and stibnite:implications for the genesis of antimony mineralization in the Yangla Cu skarn deposit,Northwestern Yunnan,china

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Acta Geochimica 2024年第3期43卷 535-554页

作者： Ping Pan Xinfu Wang Bo Li Guo Tang Zuopeng Xiang Faculty of Land and Resource Engineering Kunming University of Science and TechnologyKunming 650093China kunming Metallurgy college Kunming 650033China School of Earth Science Yunnan UniversityKunming 650500China kunming Prospecting design institute of china nonferrous metals industry co. LtdKunming 650051China

The Yangla Cu skarn deposit is located in the central part of the Jinshajiang Suture Zone,southwest china,with a total reserve of 150 Mt Cu@1.03%.The newly discovered antimony orebodies at the depth of Yangla are strictly controlled by the stratum,structure,and lithology,which are lenticular and vein-like within the marble fracture zone,which can provide a window into multistage miner-alization and ore genesis at Yangla.Mineralization can be divided into three types,Cu–Pb–Zn(skarn)pyrite,galena,and sphalerite,Cu(porphyry)chalcopyrite and pyrite,and Sb(hydrothermal)stibnite and pyrite.The mineral assem-blages were stibnite+pyrite+calcite+quartz±minor scheelite in antimony ores.This study presents quantitative measurements of the trace element compositions of pyrite and stibnite from the Yangla antimony ores.Analysis of pyrite with electron probe microanalysis(EPMA)showed enrichment in co,Ni,Sb,As,and Mo,and deficit in its S and Fe contents when compared to the stoichiometric con-centrations of S and Fe in pyrite.The Sb-related pyrite may belong to sedimentary-reworked genesis and may be modi-fied by hydrothermalfluids,thereby presenting a certain dif-ference(i.e.,crystal morphology,texture,and chemical com-position)compared to the skarn and porphyry Cu-related pyrite in the Yangla Cu skarn deposit.Analysis of stibnite with EPMA and inductively coupled plasma-mass spectrom-etry showed enrichment in As,Pb,Sn,Pb,Cu,and Zn,and presented much higher Sb contents and slightly lower S con-tents when compared to the stoichiometric concentrations of Sb and S in stibnite.Statistical analysis of the stibnite trace elements showed correlations for the elemental pairs Cu–Pb,As–Sb,and Sn–Pb,and the coupled substitution equations Sb^(3+)↔Cu^(+)+Pb^(2+),Sb^(3+)↔As^(3+),and Sn^(2+)↔Pb^(2+)may be the major factors governed the incorporating Cu,Pb,As and Sn within the stibnite.Moreover,this study preliminary shows that the antimony mineralization may belong to a car-bonate replacement hydrothermal genesis at Yangla.

关键词： Trace elements Pyrite Stibnite Substitution mechanisms Antimony mineralization Yangla Cu skarn deposit

Intelligent prediction of slope stability based on visual exploratory data analysis of 77 in situ cases

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International Journal of Mining Science and Technology 2023年第1期33卷 47-59页

作者： Guangjin Wang Bing Zhao Bisheng Wu Chao Zhang Wenlian Liu Faculty of Land Resources Engineering Kunming University of Science and TechnologyKunming 650093China Yunnan International Technology Transfer Center for Mineral Resources Development and Solid Waste Resource Utilization Kunming 650093China State Key Laboratory of Hydroscience and Engineering Department of Hydraulic EngineeringTsinghua UniversityBeijing 100084China State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan 430071China China Nonferrous Metals Industry Kunming Survey and Design Research Institute Co.Ltd Kunming 650051China

Slope stability prediction research is a complex non-linear system problem.In carrying out slope stability prediction work,it often encounters low accuracy of prediction models and blind data preprocessing.Based on 77 field cases,5 quantitative indicators are selected to improve the accuracy of prediction models for slope stability.These indicators include slope angle,slope height,internal friction angle,cohesion and unit weight of rock and soil.Potential data aggregation in the prediction of slope stability is analyzed and visualized based on Six-dimension reduction methods,namely principal components analysis(PCA),Kernel PCA,factor analysis(FA),independent component analysis(ICA),non-negative matrix factorization(NMF)and t-SNE(stochastic neighbor embedding).combined with classic machine learning methods,7 prediction models for slope stability are established and their reliabilities are examined by random cross validation.Besides,the significance of each indicator in the prediction of slope stability is discussed using the coefficient of variation method.The research results show that dimension reduction is unnecessary for the data processing of prediction models established in this paper of slope stability.Random forest(RF),support vector machine(SVM)and k-nearest neighbour(KNN)achieve the best prediction accuracy,which is higher than 90%.The decision tree(DT)has better accuracy which is 86%.The most important factor influencing slope stability is slope height,while unit weight of rock and soil is the least significant.RF and SVM models have the best accuracy and superiority in slope stability prediction.The results provide a new approach toward slope stability prediction in geotechnical engineering.

关键词： Slope stability prediction Machine learning algorithm Dimensionality reduction visualization Random cross validation coefficient of variation

The Application of Fertilizer and AMF Promotes Growth and Reduces the Cadmium and Lead contents of Ryegrass (Lolium multiflorum L.) in a copper Mining Area

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Phyton-International Journal of Experimental Botany 2023年第2期92卷 471-485页

作者： Jiaxin Chen Jiawei Guo Zhixin Yang Jiqing Yang Hengwen Dong Huiyun Wang Yalei Wang Fangdong Zhan college of Resources and Environment Yunnan Agricultural UniversityKunming650201China college of Architecture and Engineering Yunnan Agricultural UniversityKunming650201China kunming Prospecting design institute of china nonferrous metals industry co. Ltd.Kunming650051China

Heavy metal-polluted soil was collected from the Pulang copper mine in Shangri-La City,Yunnan Province,Southwest china.The effects of fertilizer(organic and inorganic)and arbuscular mycorrhizal fungi(AMF)on ryegrass(Lolium multiflorum L.)growth,root morphology,mineral nutrition and cadmium(Cd)and lead(Pb)contents were investigated by pot experiments.The results showed that both fertilizer and AMF significantly ameliorated the root morphology and mineral nutrition,reduced the Cd and Pb contents,and promoted the growth of ryegrass.Among all treatments,the combined application of organic–inorganic compound fertilizer with AMF had the highest effect,resulting in increases in root length,surface area and branch number by 2.3,1.1,and 3.9 times,respectively;an 88%increase in plant biomass;a nitrogen content increase of 2.3 and 1.2 times,and phosphorus content increase of 62%and 68%in shoots and roots,respectively was also recorded as well as decreases in Cd content by 34%and 62%and Pb content by 47%and 34%in shoots and roots,respectively.Twofactor analysis showed that both fertilizer and AMF significantly promoted ryegrass growth(plant height,biomass,chlorophyll content,root length,nitrogen and phosphorus content)and reduced the Cd and Pb contents in roots,and there was a synergistic effect between them.Moreover,the nitrogen and phosphorus contents were very significantly positively correlated with the shoot and root biomasses but very significantly negatively correlated with the Cd and Pb contents of ryegrass.Thus,the application of fertilizer and AMF synergistically improved ryegrass growth on polluted soils in the copper mining area.

关键词： Arbuscular mycorrhizal fungi heavy metal pollution organic–inorganic compound fertilizer ryegrass synergistic effect

Analysis of geometric parameters of straight wall three-centered arch and stress of surrounding rock based on conformal mapping

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Yantu Lixue/Rock and Soil Mechanics 2020年 41卷 74-84页

作者： Wu, Su Li, Ke-Gang Wu, Shun-Chuan Wang, Hang-Long Qin, Qing-Ci Li, Ming-Liang He, Fa-Yun Faculty of Land Resources Engineering Kunming University of Science and Technology Kunming 650093 China Yunnan Key Laboratory of Sino-German Blue Mining and Utilization of Special Underground Space Kunming 650093 China kunming Prospecting design institute of china nonferrous metals industry co. Ltd. Kunming 650051 China

In order to obtain the mapping function with a much higher accuracy, the barrier function algorithm based on the fmincon optimization function is used to solve the mapping function. It is considered that the conformal mapping from the outer boundary of the straight wall three-centered arch to the outer domain of the unit circle can be realized by m = 18 and n = 6, which is superior to the traditional algorithm. Based on the calculation results of analytical solution, the shape effect and size effect caused by the change of geometric parameters of the straight wall three-centered arch tunnel on the surrounding rock stress are analyzed. The results show that the increase rate of stress concentration coefficient in the arc area of the tunnel with small arch width ratio is much larger. The large stress concentration coefficient in the arc area of the tunnel with width-height ratio close to 1 is at the arch shoulder, while the maximum value, which is small, occurs at the corner of the wall. On the contrary, the large stress concentration coefficient in the arc area of the tunnel with width-height ratio far less than 1 is far away from the arch shoulder, while the maximum value is far away from the corner of the wall. When the width-height ratio is equal to 1, the maximum value of stress concentration coefficient appears at the corner, which is approximately the same as that of the stress concentration coefficient at the arch shoulder. © 2020, Science Press. All right reserved.

关键词： conformal mapping

多旋翼无人机航磁在中国云南省金平地区找矿中的应用

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Transactions of nonferrous metals Society of china 2023年第5期33卷 1550-1558页

作者：柳建新刘慧鹏刘嵘薛建强李粤华王芳中南大学地球物理与信息学院长沙410083 中南大学有色资源与地质灾害探查湖南省重点实验室长沙410083 中国有色金属工业昆明勘察设计研究院有限公司云南省岩土工程与地质灾害重点实验室昆明650051 Climate Change research Center University of New South WalesSydney NSW 2052Australia

为了对中国云南省金平县地区隐伏磁铁矿体进行探测,使用多旋翼无人机对7.8 km^(2)的目标区域进行航磁测量,克服了该地区高海拔、地形崎岖、植被茂密等带来的地面勘查困难。通过现场试验对观测噪声来源与噪声水平进行研究。然后,将质子... 详细信息

为了对中国云南省金平县地区隐伏磁铁矿体进行探测,使用多旋翼无人机对7.8 km^(2)的目标区域进行航磁测量,克服了该地区高海拔、地形崎岖、植被茂密等带来的地面勘查困难。通过现场试验对观测噪声来源与噪声水平进行研究。然后,将质子磁力仪置于距离多旋翼无人机下方3 m处位置以减小静态噪声。提出非线性滤波与逆距离加权插值算法以抑制由强风导致的动态噪声。结果表明,这些方法能减缓无人机旋翼和强风的干扰,经过处理的实测航磁数据与已知地层的水平分布吻合良好。根据航磁测量结果,在布置的4口钻井中都勘测到了隐伏的钛磁铁矿,证明旋翼无人机航磁测量找矿的有效性。

关键词：航空磁测多旋翼无人机噪声抑制隐伏钛磁铁矿