柿竹园铅锌矿床伴生银(金)的分布规律及其矿化富集机理的探讨

柿竹园蛇形坪—横山岭铅锌矿床是一个含银高的矿床,系统研究了该矿床伴生银(金)的分布特征.并探讨银(金)矿化的富集机理,认为在该区及外围有利成矿的断裂破碎带地段.可能存在有独立银(金)矿体或与铅锌矿体在空间上重叠产出的特征.值得注意寻找独立金银矿体.     

黄沙坪矿田的综合找矿模式及其在隐伏矿床预测中的应用

黄沙坪矿田的综合找矿模式可概括为已知黄沙坪铅锌矿床成矿模式、地质地球化学及地球物理找矿标志以及最优找矿方法。黄沙坪铅锌矿床成矿母岩与中酸性高侵位岩体有关,倒转背斜轴部及其纵横断裂交汇处控制矿床,走向逆冲断裂带、间层断裂或虚脱带、岩体侵入接触带等控制矿体;矿床范围内有重力、磁力、电性、放射性等异常,出现成矿元素及重矿物指示标志;探查岩体(探岩)、圈定远景区(圈区)找矿床赋存部位(找位)、寻工业矿体(寻体)是最优找矿方法。此综合找矿模式在隐伏矿床预测中的应用经钻探验证取得了积极效果。     

The exposure of global base metal resources to water criticality,scarcity and climate change

Mining operations are vital to sustaining our modern way of life and are often located in areas that have limited water supplies or are at an increased risk of the effects of climate change. However, few studies have considered the interactions between the mining industry and water resources on a global scale. These interactions are often complex and site specific, and so an understanding of the local water contexts of individual mining projects is required before associated risks can be adequately assessed. Here, we address this important issue by providing the first quantitative assessment of the contextual water risks facing the global base metal mining industry, focusing on the location of known copper, lead, zinc and nickel resources.The relative exposure of copper, lead-zinc and nickel resources to water risks were assessed by considering a variety of spatial water indices, with each providing a different perspective of contextual water risks. Provincial data was considered for water criticality (CRIT), supply risk (SR), vulnerability to supply restrictions (VSR) and the environmental implications (EI) of water use. Additionally, watershed or sub-basin scale data for blue water scarcity (BWS), the water stress index (WSI), the available water remaining (AWaRe), basin internal evaporation recycling (BIER) ratios and the water depletion index (WDI) were also considered, as these have particular relevance for life cycle assessment and water footprint studies. All of the indices indicate that global copper resources are more exposed to water risks than lead-zinc or nickel resources, in part due to the large copper endowment of countries such as Chile and Peru that experience high water criticality, stress and scarcity. Copper resources are located in regions where water consumption is more likely to contribute to long-term decreases in water availability and also where evaporation is less likely to re-precipitate in the same drainage basin to cause surface-runoff or groundwater recharge.The global resource datasets were also assessed against regional Köppen-Geiger climate classifications for the observed period 1951–2000 and changes to 2100 using the Intergovernmental Panel on Climate Change’s A1FI, A2, B1 and B2 emission scenarios. The results indicate that regions containing copper resources are also more exposed to likely changes in climate than those containing lead-zinc or nickel resources. Overall, regions containing 27–32% (473–574 Mt Cu) of copper, 17–29% (139–241 Mt Pb + Zn) of lead-zinc and 6–13% (19–39 Mt Ni) of nickel resources may have a major climate re-classification as a result of anthropogenic climate change. A further 15–23% (262–412 Mt) of copper, 23–32% (195–270 Mt) of lead-zinc and 29–32% (84–94 Mt) of nickel are exposed to regional precipitation or temperature sub-classification changes. These climate changes are likely to alter the water balance, water quality and infrastructure risks at mining and mineral processing operations. Effective management of long-term changes to mine site water and climate risks requires the further adoption of anticipatory risk management strategies.     

福建武夷山龙井坑铅锌矿地质特征及找矿远景分析

武夷山龙井坑铅锌矿（化）体贮存于逆冲推覆构造带中,受其控制,矿（化）体产出特征取决于推覆构造带的规模和形状。通过对矿区成矿地质条件及地球物化异常特征等的分析,初步认为属中低温热液型矿床。     

Authigenic potassic silicates in the Rathdowney Trend,southwest Ireland: New perspectives for ore genesis from petrography of gangue phases in Irish-type carbonate-hosted Zn-Pb deposits

Petrographic studies of Zn-Pb ore zones hosted by Lower Carboniferous dolomitized Waulsortian reef limestones in the Rathdowney Trend reveal a paragenetic association between sphalerite and potassium silicates: (Ba, K)-feldspar, adularia, and albite as well as rare quartz, illite and phengite. The dominant mineral assemblage is composed of 1) sphalerite ± (K,Ba) feldspar ± pengite/illite near the putative feeder conduit for the Lisheen Main Zone, and 2) a sphalerite ± pengite/illite assemblage distal to the major normal faults (NW of Main Zone, Island Zone and Rapla occurrence). In addition, clay minerals have been identified in fault gouges located at the interface between the Waulsortian reef and argillaceous limestone of the Ballysteen Formation. This mineral assemblage has provided additional constraints on the physico-chemical conditions of ore formation (eH, pH, sulfur and metal species). Another implication of the mineral assemblage, is a revision of fluid rock interaction processes, in which mineral solution-precipitation reactions are contributing to the development of hydrothermal breccias, with dolomitic black matrix breccias interpreted as a by-product of massive sulfide precipitation. Additionally, textural studies of the breccias through fractal dimension analysis of fragment geometry extracted from large scale scanning electron microscope element maps (1 cm² areas or more), indicates the prevalence of chemical brecciation-corrosion processes in the generation of the black matrix breccias. Integration of these new observations allows for comparison of ore forming processes across the Irish Midlands from the perspective of gangue mineralogy and may provide further links with classic Mississippi-type deposits from the mid-continent region of the United States of America.     

滇西保山地块金厂河矿集区铁铜金铅锌多金属矿床成矿系统

滇西保山地块是西南"三江"特提斯构造带的重要组成部分,其大地构造位置处于藏-滇-泰-马中间板块中段,是近年来科学研究和地质找矿的热点地区之一.受区域构造演化的影响,保山地块先后历经原、古、中、新特提斯演化,并发生了多期成岩成矿事件,在北部形成了以金厂河铁铜铅锌矿、核桃坪铅锌矿、陡崖铁铜多金属矿、黑牛凹金矿、黄家地金矿等...     

北武夷生米坑铅锌矿床地质地球化学特征与成因探讨

生米坑铅锌矿床位于北武夷中生代火山岩带的黄岗山火山盆地内, 已知铅锌矿体呈脉状产于侏罗系上统鹅湖岭组流纹质熔结凝灰岩的断裂内, 或呈细脉——浸染状分布于钾质粗面斑岩内, 发育钾长石化、绿泥石化、硅化等蚀变。地球化学特征显示矿区火山——侵入岩属于贫钠富钾的S型花岗岩, 其w(SiO₂)值为62.42%~78.02%、w(K₂O +Na₂O)值为7.66%~9.13%、w(K₂O)/w(Na₂O)比值为1.18~2.62、里特曼指数δ为1.67~3.78;矿区岩石LREE/HREE比值平均为10.94×10-6, 属于轻稀土富集型; Eu普遍亏损, 特别是熔结凝灰岩、黑云母花岗岩δEu＜0.31, 表明经历了显著的斜长石的分离结晶作用; 自早至晚主阶段岩浆活动稀土总量逐渐降低。从∑REE总量值、δEu值、地球化学参数及标准稀土元素配分模式图上看, 生米坑铅锌矿化蚀变岩与钾质粗面斑岩具有密切的成因联系。钾质粗面斑岩锆石(SHRIMP)年龄138.3±1.4 Ma, 表明矿床形成于燕山期白垩纪早期, 矿床成因类型属次火山热液型铅锌矿床。      

湘西自治州北部铅锌矿找矿标志及找矿远景区

湘西自治州北部铅锌矿带,处于桑植复向斜西南段,长100km以上,宽50km左右,矿带内铅锌矿点广布,受地层、构造、岩性的控制。上寒武统耗子沱群至下奥陶统大湾组共有7个含矿层位,北东向背斜倾伏端及北东向断裂、层间裂隙以及次级北西向横跨背斜是矿床控矿构造,有矿体赋存的含矿层有明显的硅化作用,且硅化体中Pb,Zn,Cu明显富集,分别为地层的66、32、8倍,Sr/Ba比值为0.60,无矿存在的硅化体则Pb,Zn,Cu含量接近地层或稍高于地层,Sr/Ba比值高达1.15。在砂子坡背斜南翼、红岩溪背斜北东端和南西倾伏端、盐井背斜,下奥陶统红花园组顶部含矿层内为找矿远景区。     

连县小带铅锌铁锰矿床特征与喷流沉积机制浅析

连县小带是粤北近几年发现的又一喷流沉积铅锌矿床。简要介绍其成矿环境、地质特征,讨论喷流(喷气)沉积(成矿)作用及成矿分带的主要地球化学机制,如因脉动喷流(喷气)造成盆地内地球化学性质的周期变化,引起矿石组构的周期变化等。     

南京甘家巷铅锌矿开发可行性研究

从矿床开发的地质资源条件、开采条件、矿石的可选性、外部建设条件以及经济效益分析等方面，论述了该矿建设的优越条件；提出了利用关闭矿山生产设施进行选矿的建设方案。认为该矿的潜在价值极大，其开发必将带来良好的社会效益和经济效益。