基于MatLab的神经网络在江苏矿山地质环境评估中的应用     

刘洪  张宏斌 《江苏地质》2007,31(4):348-353

神经网络作为一种新的方法体系,具有分布并行处理、非线性映射、自适应学习和鲁棒容错等特性,在模式识别、控制优化和智能信息处理等方面有着广泛的应用。利用MatLab的神经网络工具箱,建立了江苏矿山地质环境质量的评估模型,评估结果经过实际验证,具有较高的可信度和实用性。  相似文献   

南召县石鼓金矿地质特征及成因探讨   总被引：1，自引：0，他引：1  

谢国敏  张征  谢珂  陈静 《华南地质与矿产》2007,(4):35-40

石鼓金矿位于北秦岭复杂褶皱带东段,乔端-瓦穴子断裂南侧,牧虎顶花岗岩体之北侧,矿脉的产出受断裂构造控制.矿脉数量多,规模大小不一,成矿与构造岩浆活动等关系密切.矿床类型为石英脉型.  相似文献   

布雅煤矿一井田煤中硫的特征及脱硫方法     

徐进  敬益武 《煤田地质与勘探》2001,29(5):14-16

从宏观、微观和煤化学几个方面 ,研究了新疆和田县布雅煤矿一号井田主采煤层中硫的赋存形态、含量、变化规律及成因。并提出几种脱硫方法 ,对煤矿生产出质量好的洁净煤 ,有一定的参考价值  相似文献   

Arsenic in mine waters: an international study   总被引：4，自引：4，他引：4  

M. Williams 《Environmental Geology》2001,40(3):267-278

 Hydrochemical data are presented for arsenic (As) in the mine waters of 34 gold and base-metal mining localities in seven countries of south-east Asia, Africa and Latin America, encompassing contrasting climatic settings and at least eight discrete styles of primary mineralization. Peak dissolved As concentrations at these sites range from 0.005–72 mg/l, with the United States Environmental Protection Agency (US-EPA) potable water threshold of 50 μg/l exceeded in 25 cases. Arsenate (As⁵⁺) constitutes the dominant species at over 80% of sites. Very high dissolved As concentrations (>1 mg/l) show no systematic between-site relationship with mine water pH/Eh regime. Important determinants of mine water As fluxes include iron hydrochemistry, the presence of cyanic ore processing effluents, site geology, the paragenetic sequence that follows sulphide oxidation, climate and mine management. Human toxicological impacts of As contamination have been recognized at only one case-study site, with a further four considered to warrant more detailed risk assessment. Received: 2 November 1999 · Accepted: 21 March 2000  相似文献   

矿震预报可能性的探讨     

徐世杰 《东北地震研究》1992,(1)

矿震是危害矿山安全生产的严重灾害,人们在长期生产实践和研究探索中发现,应用断裂力学知识和地震科学知识以及矿山形变测量资料,有可能对矿山地震作出某种预报。  相似文献   

浅论砚石台煤矿滑覆构造及煤炭资源远景     

曾金源 《四川地质学报》1995,(1)

对砚石台地区地层构造及滑覆构造组成要素、特征、形成机制进行了系统分析，论述了滑覆构造对煤层的影响，预测了－５００ｍ标高以下构造形态，提出－５００ｍ标高以下无须工作的建议。  相似文献   

对中梁山煤矿地质构造特征的认识     

刘应安 《四川地质学报》1995,(2)

根据３０多年矿井生产实测资料，对中梁山煤矿地质构造进行了分析研究，认为该矿地质构造虽然复杂，但也具有一定的规律，可分为简单、中等、复杂等不同构造区，大断层虽较多但对矿井开采影响不大，只是小型压扭性断层对采矿造成一定困难，故提出开采时应对症下药及保护资源的建议。  相似文献   

Mineralogical and geochemical behavior of mill tailing material produced from lead-zinc skarn mineralization,Hanover, Grant County,New Mexico,USA   总被引：3，自引：0，他引：3  

I. F. Walder  W. X. Chavez Jr. 《Environmental Geology》1995,26(1):1-18

Mineral extraction and processing, especially metal mining, produces crushed and milled waste; such material, exposed to weathering, poses the potential threat of environmental contamination. In this study, mill tailings from inactive Pb-Zn mines in New Mexico, southwest USA, have been examined for their potential environmental impacts by means of detailed mineralogical and geochemical characterization. The principal ore minerals remaining in the tailings material are sphalerite, chalcopyrite, and very minor galena, smithsonite, and cerrusite, accompanied by the gangue minerals pyrite, pyrrhotite, magnetite, hematite, garnet, pyroxene, quartz, and calcite. White precipitate occurring on tailings surfaces is composed of gypsum and hydrated magnesium sulfates. Pyrite is mostly unaltered or shows only micron-scale rims of oxidation (goethite/hematite) in some surface samples. This iron oxide rim on pyrite is the only indication of weathering-derived minerals found by microscopy. There are variations in element concentrations with depth that reflect primary variations through time as the tailings ponds were filled. Cadmium and Zn concentrations increase with depth and Ag and Pb are low for the uppermost core samples, while Cu, Ni, and Co concentrations are generally high for the uppermost core samples. These elemental distributions indicate that little or no leaching has taken place since emplacement of the tailings because no accumulation or enrichment of these metals is observed in Hanover tailings, even in reducing portions of tailings piles. Element concentrations of surface samples surrounding the tailings reflect underlying mineralized zones rather than tailings-derived soil contamination. We observed no successive decreasing metal concentrations in prevalent wind directions away from the tailings. Stream sediment samples from Hanover Creek have somewhat elevated Zn, Cd, and Pb concentrations in areas that receive sediments from erosion of the tailings. However, input from tributaries downstream of the ponds appears to be principal source of heavy metals in Hanover Creek. The results of this study indicate that there is low risk for groundwater heavy-metal contamination from Hanover tailings. Tailings material do not show significant geochemical oxidation/alteration or metal leaching with depth. Our studies indicate that neutralizing minerals present in the tailings are sufficient to keep the tailings material chemically stable. Geochemically, however, tailings materials are being eroded and may pose a threat to Hanover Creek via siltation.  相似文献   

Rare-earth element mobility during ore-forming hydrothermal alteration: A case study of Dongping gold deposit Hebei Province,China     

包志伟  赵振华 《中国地球化学学报》2003,22(1):45-57

REE mobility during hydrothermal ore-forming processes has been extensively investigated in recent years and the potential of REE to provide information about ore forming processes has commonly been recognized.The Dongping gold deposit,which is located in northwestern Hebei Province,China,occurring in the inner contact zone of the Shuiquangou syenite complex,is spatially,and probably genetically,related to the syenite,the deposit was formed under the moderate to high temperature(220℃ to 320℃),weakly acidic to weakly alkaline,rather high fo2(lgfo2=-30～-34)environment.The REE study of the host rocks,altered wall rocks,ores and gangue minerals from the deposit suggests that the REEs have been mobilized and differentiated during K-feldspathization and silicification.The extremely altered syenite enveloping auriferous quartz vein shows positive Ce anomaly and larger LREE/HREE ratio than that of the unaltered syenite.The REE concentrations and patterns of the ores are determined by the ore types and mineral assemblages,LREE/HREE ratios in the gangue quartz and hydrothermal Kfeldspars are relatively low.The most significant observation is that the gangue quartz shows significant positive Eu anomaly,whereas the hydrothermal K-feldspars show less significant or no positive Eu anomaly at all relative to the primary feldspar in the unaltered syenite. It is evident that the REEs are mobile during K-feldspathization and silicification in the ore forming process.Weak to moderate K-feldspathization caused REE mobility without apparent differentiation with the exception of extreme K-feldspathization and silicification which resulted in significant depletion of HREE and Eu and relative enrichment of Ce.The REE,Y,U,Th and Au contents of the syenite decrease as the degrees of K-feldspathization and silicification of the rocks increase towards the auriferous quartz veins.As the ores were deposited under a rather oxidized environment,Ce^4 predominated over Ce^3 .The precipitation of the former in the form of CeO2 or absorpted onto the secondary mineral assemblage resulted in the inconsistent removal of the REE and the relative Ce enrichment in the strongly altered rocks.in contrast,Eu was present mainly in a low valence state (Eu^2 ).The geochemical differences from the other REE^3 and much less sites in the secondary minerals to accommodate the Eu released form the original minerals resulted in the enrichment of Eu in the fluids.The mobility and differentiation of REE and the coherent mobilities of Y,U,Th and Au also support the argument that the syenite is one of the source rocks for gold mineralization.The REE contents and patterns of the altered rocks enveloping the auriferous quartz vein could be used as a guide for locating ore veins in mineral exploration.  相似文献   

煤矿矿图的GIS管理、更新与共享   总被引：5，自引：0，他引：5  

杨可明  吴立新  陈书琳  王彦兵 《地理与地理信息科学》2003,19(2):42-43,51

矿山地学信息时刻处于时空动态变化中,矿图的及时维护与更新十分重要。该文针对矿山需求,基于矿山GIS（MGIS）、Web－GIS和办公自动化（OA）技术,结合矿山GIS基础平台TT－MGIS^2002,介绍了矿图管理、绘制、更新及网络共享问题。  相似文献