Mobilization and attenuation of heavy metals within a nickel mine tailings impoundment near Sudbury, Ontario, Canada   总被引：1，自引：0，他引：1  

R. G. McGregor  D. W. Blowes  J. L. Jambor  W. D. Robertson 《Environmental Geology》1998,36(3-4):305-319

 The oxidation and the subsequent dissolution of sulfide minerals within the Copper Cliff tailings area have led to the release of heavy metals such as Fe, Ni, and Co to the tailings pore water. Dissolved concentrations in excess of 10 g/l Fe and 2.2 g/l Ni have been detected within the shallow pore water of the tailings, with increasing depth these concentrations decrease to or near analytical detection limits. Geochemical modelling of the pore-water chemistry suggests that pH-buffering reactions are occurring within the shallow oxidized zones, and that secondary phases are precipitating at or near the underlying hardpan and transition zones. Mineralogical study of the tailings confirmed the presence of goethite, jarosite, gypsum, native sulfur, and a vermiculite-type clay mineral. Goethite, jarosite, and native sulfur form alteration rims and pseudo-morphs of the sulfide minerals. Interstitial cements, composed of goethite, jarosite, and gypsum, locally bind the tailings particles, forming hardpan layers. Microprobe analyses of the goethite indicate that it contains up to 0.6 weight % Ni, suggesting that the goethite is a repository for Ni. Other sinks detected for heavy metals include jarosite and a vemiculite-type clay mineral which locally contains up to 1.6 weight % Ni. To estimate the mass and distribution of heavy metals associated with the secondary phases within the shallow tailings, a series of chemical extractions was completed. The experimental design permitted four fractions of the tailings to be evaluated independently. These four fractions consisted of a water-soluble, an acid-leachable, and a reducible fraction, as well as the whole-rock total. Twenty-five percent of the total mass of heavy metals was removed in the acid-leaching experiments, and 100% of the same components were removed in the reduction experiments. The data suggest that precipitation/coprecipitation reactions are providing an effective sink for most of the heavy metals released by sulfide mineral oxidation. In light of these results, potential decommissioning strategies should be evaluated with the recognition that changing the geochemical conditions may alter the stability of the secondary phases within the shallow tailings. Received: 9 April 1997 · Accepted: 21 July 1997  相似文献   

电镀镍锰胎体金刚石钻头的应用   总被引：6，自引：1，他引：5       下载免费PDF全文

李超群 《探矿工程》1998,(2):36-38

对电镀镍锰胎体金刚石钻头和镍钴胎体钻头的使用情况进行了对比。实践证明,镍锰胎体钻头特别适用于钻进坚硬破碎、强研磨性地层和软硬交替的地层。  相似文献   

五大连池药用矿泥的主要特点及其药用价值     

赵惠敏  刘嘉麒 《岩石学报》1997,13(2):266-272

五大连池药用矿泥２００目筛上样品主要由玄武质火山碎屑、石英、辉石以及其它少量晶屑组成，２００目筛下样品由伊利石、绿泥石、高岭石和石英、少量长石等多种粘土矿物组成。该矿泥应属于与本区多期火山喷发物源有关的表生泥质沉积。由于这种沉积矿泥有特殊成因，从而具有药用价值  相似文献   

广西氧化锰矿类型及成矿条件          下载免费PDF全文

刘腾飞 《地质找矿论丛》1997,12(4):45-56

本文从分析区域成矿地质背景和含锰岩系出发，全面论述了广西氧化锰矿类型，在总体各类氧化锰矿成矿机理和主要特征基础上，综合归并三类七型氧化锰矿划分对比图，其中特别指出岩溶洼地锰矿是地方特色的新类型锰矿，具有很大的找矿意义，在分析广西氧化锰矿的原岩，地质构造，地形地貌，气候及水文地质条件等成矿条件的基础上，建立了氧化锰矿成矿模式图，最后指出了广西氧化锰矿还有很大的找矿远景。  相似文献   

The mechanism of mine-collapse deduced from seismic observations     

Wolfgang A. Lenhardt  Christiane Pascher 《Pure and Applied Geophysics》1996,147(2):207-216

On May 2, 1993 more than 200 seismic events from an underground mine in Tyrol/Austria were recorded with short-period seismometers of a local seismic network which was introduced in the late 1980s to monitor the tectonic seismicity in Tyrol in greater detail. The cause of this series of mining-associated events has become the subject of intensive investigations — as it was associated with a subsidence affecting an area of 10.000 m². Underground observations revealed a number of discontinuities along which the rock mass was able to move. Seismic recordings of the close-by seismic stations revealed two types of mechanisms: One mechanism seems to be associated with pure block-sliding along several discontinuities, while other signals indicate additional collapse. The consideration and combination of several seismological principles made possible the construction of a model of the mine collapse.  相似文献   

    

Shao-Quan Zhang  Zhen-Qi Ren  Lian-Cheng Zhang  Jian-Jun Zhang  Li-Ye Zou 《地震学报(英文版)》1996,9(4):679-690

A brief account of the development of the research on mining earthquakes and the general situation of the Mentougou Coal Mine medium-scale experiment field for earthquake prediction and the project of monitor and prediction is given. The differences of waveforms between mining earthquakes and natural earthquakes is discussed. The magnitude-frequency distribution of the 79 000 mining earthquakes of overM _l 1. 0 from 1984 to 1995 is summarized. Finally, taking PH and PV, the principal compressive stress components of the focal mechanism of the mining earthquakes, as the criteria, analyses the stress background of the 12 large mining earthquakes. Contribution No. 95C0002, Institute of Geophysics, SSB, China. This study is sponsored by the Chinese Joint Seismological Science Foundation.  相似文献   

三山岛金矿海边地下开采矿山稳定性的数值模拟分析   总被引：1，自引：0，他引：1  

刘竹华  杨家录 《工程地质学报》1996,4(2):24-30

本文用数值模拟的分析方法, 评价了三山岛金矿地下开采引起的开采效应及地表下沉盆地的变形特征。结果表明, 矿山地表是稳定的, 上部一期工程开采引起的地表最大下沉量不超过700mm, 深部开挖时不超过995mm左右；在采场充填的情况下, 地表下沉值将降低55%左右；由于矿山地表变形较小, 加之覆盖层第四纪中存在着两层总厚度8～12m的隔水粘水层, 因此不致沟通地表水与井下的直接联系而危及矿山的安全。  相似文献   

以冶山铁矿为例谈充分利用现有铁矿资源的问题     

赵连奎 《江苏地质》1996,20(2):123-125

我国每年铁矿石供应缺口较大，并在逐年扩大，认真抓好现有矿山，充分利用现有铁矿资源，减少缺口，已势在必行。文章结合冶口 铁矿实际，提出有关措施，继续对矿山优惠政策，并鼓励矿山充分利用资源，加强矿山技术改造，坚持采矿与找矿并重，努力提高矿石的开采回收率，减少损失率，降低  相似文献   

皖北刘桥二矿井下析出物的成因探讨     

李定龙  汪茂连  孙本魁 《江苏地质》1996,20(4)

刘桥二矿投产两年多来，井下的渗水部位不断有钙、铁、锰质等析出物形成。初步分析，这是地下水的水文地球化学环境变化及其对基岩产生机械、化学潜蚀作用的结果。析出物的形成速度较快，局部排出量大，对矿井水环境质量及基岩强度有一定影响，应引起有关部门重视。  相似文献   

Analytical techniques for the estimation of mine water inflow   总被引：1，自引：0，他引：1  

Singh  R. N.  Atkins  A. S. 《Geotechnical and Geological Engineering》1985,3(1):65-77

Summary This paper outlines various analytical techniques for mine water inflow estimation incorporating several refinements such as finite boundary conditions, linear, fracture and turbulent flow conditions to pumping wells and underground excavations. These modifications enable practical mining to be simulated and therefore, permit more accurate predictions of mine inflow quantities. Application of these techniques are given together with the scope of the application.  相似文献