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1.
庙前高岭土矿床原矿主要由石英、７Ａ我水高岭石和伊利石组成，含水量微斜长石及三水铝石；原矿全铁（Ｆｅ２Ｏ３）含量为０．２６％，二氧化钛含量０．０３％，铁、伏含量较低；－４５μｍ粒级自然白度７８．４％；矿石易于分选，是优质的陶瓷和填料原料矿床。 相似文献
2.
通过对西峡金红石矿床的矿体形态、厚度、品位及其变化，矿化连续性及矿体复杂程度的综合分析，进行多方案的计算对比，确定该矿床宜以露天－地下兼用的方式开采．露采是低工业品位１．６％，边界品位１．３％；露天－地下兼用的开采方式最低工业品位１．８％，边界品位１．４％。 相似文献
3.
江苏爱景山锶矿为大型中低温热液脉状充填型矿床,现由南京锶矿进行露天开采,目前生产规模年产原矿1.7万t(商品矿1万t)。如果矿山采用采场直接采出部分高品位商品矿,其余低品位原矿进入选厂用重浮联选法选矿,在矿山已发生的现金流量基础上,对比两种方案经济效益,则年产原矿3.4万t(商品矿2万t)的生产规模经济效益好于现有生产规模,其贷款偿还期6.16年,内部收益率36.89%。按化学矿山基准收益率10%计算,矿山在露采期(19年)可获得1192.55万元的净现值收益。 相似文献
4.
桃江王家冲锑矿床地质特征及其科技咨询服务 总被引：1，自引：0，他引：1
桃江王家冲中型锑矿床，赋存在上元古界板溪群五强溪组中段灰绿色板岩中，背斜翼部的层间剥离、破碎裂隙是矿床形成的储矿构造，东西向断裂Ｖ＿４、Ｖ＿５为控矿构造。矿区一般见２～３层矿，平均厚度１．２４ｍ，平均品位Ｓｂ４．９８％。矿石矿物主要是辉锑矿。矿床成因属燕山期中低温液型锑矿床。该矿床已有７０年开采历史，去年曾出现资源危机，矿山面临关闭。笔者应邀赴矿对井下未知矿体进行预测，旨在指导生产找矿。由于科技咨询与生产找矿紧密结合，短时间内就取得了找矿突破，解了矿山燃眉之急，延长了矿山生产服务年限，社会经济效益明显。 相似文献
5.
福建省境内重晶石矿产地虽少．但单个矿床规模大，开发程度高，已取得较好的社会效益与经济效益。本文将以资源为基础．对国内外开发利用现状和发展趋势进行分析、研究．从而提出合理开发利用、扩大应用领域与提高经济效益的发展对策。 相似文献
6.
世界级金银铜铜锌矿床的定量分析 总被引：4，自引：1，他引：4
迄今为止，世界范围内已探明的资源总量，计金１９．３万吨，银１７４万吨，铜１５亿２千万吨，铅３亿４千９百万吨，锌７亿１千３百万吨。马上述所探明的每种金属堆积成立方体、则金，边长为２２ｍ的立方体；银，边长为５５ｍ的立方体；铜，边长为５５０ｍ的立方体；铅，边长为３１０ｍ的立方体；锌，边长为４６０ｍ的立方体。 相似文献
7.
智利和秘鲁是世界上主要的铜资源国和产铜国.两国铜矿资源绝大部分来自斑岩铜矿.智利现有铜储量(金属量,下同)1.5亿吨,名列世界第一.1978年产铜104万吨,仅次手美国(135万吨)、苏联(110万吨).智利斑岩铜矿带从该国中部的特尼恩特铜矿到最北部的莫恰铜矿长两千多公里,带内有几十个大小不等的铜矿床.其中储量在100万吨以上的矿床不下十几个.特别是北部的丘基卡马塔和中部的特尼恩特铜矿,为世界上最大的斑岩铜矿床.秘鲁现有铜储量2720万吨,居世界第七位.1978年产铜35万吨,位于美、苏、智、加、赞、扎之后.全秘鲁大致可以分北部、中部及南部三个铜矿带,其中以南部斑岩铜矿带最重要.该带从最南部的托克帕拉矿床往北西延伸长约千余公里,现有斑岩铜矿床 相似文献
8.
建立健全各级矿产资源开发管理机构,是为了更好地对全国矿产资源合理开发利用与保护进行有效的监督管理,使矿产资源发挥其更大的社会经济效益.这就是建立矿管机构的总目的.我国目前有县以上国营矿山企业6000多个、乡镇集体矿山企业和个人采矿有12万多个,年产矿石总量达15亿多吨.但在开发利用矿产资源方面还存在着问题,主要表现在:已探明大量的矿产储量尚未得到充分合理地 相似文献
9.
东胜煤系高岭土矿床地质特征及开发利用前景 总被引：3，自引：0，他引：3
东胜煤系砂岩型高岭土矿床是特大型沉积矿床，矿床地质条件简单，开采条件优越，矿石分３种类型，以砂岩型为主体，原矿组成简单，质量优良，尾矿以石英为主，是一种质量优良的玻璃原普，可综合利用，该高岭土的开发可与煤炭同步进行，具有投资少，见效快的特征，开发前景广阔。 相似文献
10.
白云鄂博矿床稀土矿物稳定同位素特征及其意义 总被引：4，自引：0，他引：4
稀土元素是白云鄂博矿床最有特色的矿产。本文在详细讨论了稀土矿物氧、碳同位素制样方法的基础上，对矿床中晚期脉、白云石型矿石、萤石型矿石中的主要稀土矿物进行了系统的氧、碳同位素分析。其中，晚期脉中的氟碳酸盐矿物的碳、氧同位素值较低，具有幔源热液结晶的特点；白云岩型矿石中氟碳铈矿δ１３Ｃ在－１．１‰～－３．４‰，δ１８Ｏ在８．６‰～１２．０‰；独居石δ１８Ｏ在５．７‰～１１．４‰，磷灰石δ１８Ｏ在６．３‰～９．４‰；萤石型矿石中氟碳铈矿δ１３Ｃ在－５．２‰～－５．８‰，δ１８Ｏ在３．６‰～５．５‰；独居石δ１８Ｏ在３．５‰～４．５‰。结合矿床地质特征分析，矿区萤石型矿石和晚期脉的形成可能与深源热液有关；而白云岩中的稀土矿化作用则表现出多源多期次的特点 相似文献
11.
白云鄂博矿床东矿段深部及白云向斜核部探矿的可行性探讨 总被引：5，自引：0，他引：5
白云鄂博东矿（铁矿石）已属于轻度危机矿山,解决白云鄂博东矿的资源接续问题已迫在眉睫。依据老地质资料和生产过程中的新发现,参考多位矿床成因研究专家的成果,笔者等认为在白云鄂博东矿体深部及白云向斜核部探矿是可行的。 相似文献
12.
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
13.
分析天津滨海新区浅层超软土加固处理存在的问题,提出常规方案、单排单管方案和单排单管加密方案。依托天津滨海新区某工程,开展现场对比试验。结合各种监测检测成果,对比分析3种方案加固效果,并提出进一步优化改进建议。工程实践表明,经过3种方案加固处理,吹填淤泥表层会形成具有一定强度和厚度的硬壳层,土体物理力学性质明显改善,均能满足后续吹填砂垫层和机械插板的施工要求。另外,单排单管方案和加密方案加固效果明显优于常规方案,尤其有利于硬壳层厚度的形成。从长远加固效果角度出发,单排单管方案及加密方案更可取。 相似文献
14.
The Advanced Research WRF (ARW) model is used to simulate Very Severe Cyclonic Storms (VSCS) Hudhud (7–13 October, 2014), Phailin (8–14 October, 2013) and Lehar (24–29 November, 2013) to investigate the sensitivity to microphysical schemes on the skill of forecasting track and intensity of the tropical cyclones for high-resolution (9 and 3 km) 120-hr model integration. For cloud resolving grid scale (<5 km) cloud microphysics plays an important role. The performance of the Goddard, Thompson, LIN and NSSL schemes are evaluated and compared with observations and a CONTROL forecast. This study is aimed to investigate the sensitivity to microphysics on the track and intensity with explicitly resolved convection scheme. It shows that the Goddard one-moment bulk liquid-ice microphysical scheme provided the highest skill on the track whereas for intensity both Thompson and Goddard microphysical schemes perform better. The Thompson scheme indicates the highest skill in intensity at 48, 96 and 120 hr, whereas at 24 and 72 hr, the Goddard scheme provides the highest skill in intensity. It is known that higher resolution domain produces better intensity and structure of the cyclones and it is desirable to resolve the convection with sufficiently high resolution and with the use of explicit cloud physics. This study suggests that the Goddard cumulus ensemble microphysical scheme is suitable for high resolution ARW simulation for TC’s track and intensity over the BoB. Although the present study is based on only three cyclones, it could be useful for planning real-time predictions using ARW modelling system. 相似文献
15.
Predictive simulation of three exploitation schemes for the brines in the Bieletan section of the Charham Salt Lake, China 总被引：1，自引：0，他引：1
Zhou Xun Fang Bin Chen Mingyou Zhao Liang Zhang Hua Shen Ye 《Environmental Geology》2006,49(7):1021-1033
Potassium-rich halite ores and brines occur in the Charham Salt Lake area in the Chaidam Basin in northwest China. The mean
14.3 g/l of potassium in the brines in the near-surface halite aquifer makes the Charham Salt Lake an important base for production
of potassium fertilizer in China. About 30×104 m3/day of brines has been pumped from the current ditches in the Bieletan section in the west of the area, creating a cone of
depression in the water table near the ditch system. A two-dimensional mathematic model describing the flow of the brines
is established to predict the changes in the water table. The flow domain was discretized into 1,185 triangular elements with
641 nodes. Data of brine production through pumping ditches from November 2002 to August 2003 were used to identify the model.
The developed model can be employed to predict the exploitation regimes caused by three proposed exploitation schemes A, B
and C. A withdrawal rate of 22.67×104 m3/day of brines is pumped through the current ditch system in scheme A and through the current ditch system plus 16 wells in
scheme B. The results of the 5 years predictive simulation for schemes A and B indicate that these rates will cause a normal
fall in water table in the pumping period of 9 months and a rise in water table in the recovery period of 3 months in each
of the 5 years, with one depression cone near the current ditches in scheme A and two depression cones near the current ditches
and the proposed wells in scheme B. In scheme C three more ditch systems are proposed to be excavated in the northeast, northwest
and southwest of the Bieletan section and brines are pumped through each of the four ditch systems in turn for 1 year in every
4 years. The predictive simulation results of scheme C suggest that normal changes in the water table will also be expected
and a continual increasing or decreasing trend in the water table will not be encountered in a 12-year period of prediction.
The water table near each of the four ditch systems will recover sufficiently after a 39-month recovery. 相似文献
16.
Carlos Alberto Spier Sonia Maria Barros de Oliveira Carlos Alberto Rosière José Domingos Ardisson 《Mineralium Deposita》2008,43(2):229-254
Several major iron deposits occur in the Quadrilátero Ferrífero (QF), southeastern region of Brazil, where metamorphosed and heterogeneously deformed banded iron formation (BIF) of the Cauê Formation, regionally called itabirite, was transformed into high- (Fe >64%) and low-grade (30%?2O3, with a higher amount of detrimental impurities, especially MnO, in the soft ore. Both hard and soft ores are depleted in trace elements. The high-grade ores at the Águas Claras Mine have at least a dual origin, involving hypogene and supergene processes. The occurrence of the hard, massive high-grade ore within “fresh” dolomitic itabirite is evidence of its hypogene origin. Despite the contention about the origin of the dolomitic itabirite (if this rock is a carbonate-rich facies of the Cauê Formation or a hematite–carbonate precursor of the soft high-grade ore), mineralogical and geochemical features of the soft high-grade ore indicate that it was formed by leaching of dolomite from the dolomitic itabirite by meteoric water. The comparison of the Águas Claras, Capão Xavier and Tamanduá orebodies shows that the original composition of the itabiritic protore plays a major role in the genesis of high- and low-grade soft ores in the QF. Under the same weathering and structural conditions, the dolomitic itabirite is the more favorable to form high-grade deposits than siliceous itabirite. Field relations at the Águas Claras and Capão Xavier deposits suggest that it is not possible to form huge soft high-grade supergene deposits from siliceous itabirite, unless another control, such as impermeable barriers, had played an important role. The occurrence in the Tamanduá Mine of a large, soft, high-grade orebody formed from siliceous itabirite and closely associated with hypogene hard ore suggests that large, soft, high-grade orebodies of the Quadrilátero Ferrífero, which occur within siliceous itabirite, have a hypogene contribution in their formation. 相似文献
17.
锚索与锚杆联合锚固支护岩坡的有限元分析 总被引：1，自引：0，他引：1
针对广东某高速公路74 m高的7级挖方边坡,采用三维弹塑性有限元数值计算方法分析山区路堑开挖岩质边坡的锚固支护的受力情况。分别计算了坡体无锚和3种不同的锚固方案。通过坡体无锚方案的计算确定坡体的滑动面并为锚固方案的设计提供依据。3种锚固方案中的预应力锚索和锚杆按不同方式进行了组合。所建立的锚固坡体三维有限元分析模型对锚固坡体进行了合理简化并节约了计算量。计算中锚索的预应力采用预先施加应变的方式施加。计算分析表明,边坡加锚后可显著减少边坡塑性区。实际工程中采用预应力锚索和锚杆交错布设方案进行边坡锚固支护可较好地达到安全与经济并重的边坡处治原则。现场监测结果表明,锚固边坡有限元分析合理可行。 相似文献
18.
J. Proenza F. Gervilla J. Melgarejo O. Vera P. Alfonso A. Fallick 《Mineralium Deposita》2001,36(7):658-669
The Potosí Mine is located in the Moa-Baracoa massif in the easternmost part of the Cuban Ophiolitic Belt. Chromite mineralization occurs within the mantle-crust transition zone. Two events of magma intrusion overprint the chromitite bodies: one gave rise to the crystallization of pegmatitic olivine-norite dikes, and the other produced pegmatitic gabbro dikes. Sulfide-poor chromite ores, brecciated chromite ores, and sulfide-rich chromite ores can be distinguished in the different chromitite bodies. Sulfide-poor ores represent more than 80 vol% of the chromitites. This type occurs far from the zones intruded by pegmatitic gabbro dikes and shows petrographic and chemical features similar to other chromitite bodies described in the Moa-Baracoa massif. Brecciated chromite ores occur within pegmatitic gabbro dikes. In this type, chromite crystals occur included within chromian diopside and plagioclase. These silicates often contain droplet-like sulfide aggregates. Sulfide-rich ores are spatially associated to the contacts between sulfide-poor chromite and pegmatitic olivine-norite dikes. These ores mainly consist of recrystallized (coarse) chromite with interstitial pyrrhotite, pentlandite, cubanite, and chalcopyrite. Chromite from sulfide-rich ores exhibits TiO2, FeO, V2O3, MnO, and especially, Fe2O3 contents, higher than those of chromite from brecciated ores and much higher than those of chromite from sulfide-poor ores. The sulfide-rich ores are PGE-rich (up to 1,113 ppb of total PGE), and show nearly flat chondrite-normalized PGE patterns, slightly above 0.1 times chondritic values. Mineralogical and chemical data indicate that the chromite ores of the Potosí Mine were modified by the intrusions of olivine-norite and gabbro dikes. The interaction between pre-existing sulfide-poor chromite ores and the intruding volatile-rich silicate melts produced strong brecciation, partial dissolution, and recrystallization (coarsening) of chromite. The sulfide assemblage formed by fractionation of the immiscible sulfide melt segregated from the volatile-rich silicate melt that generated the pegmatitic olivine-norite. The segregation of the sulfide melt can be interpreted as the consequence of chemical interaction between intruding melts and the host chromite. The variable extent of this interaction produced chromite ores with variable sulfide ratios. The magmatic nature of the sulfide mineralization is supported by sulfur isotope data, which range from -0.4 to +0.9. Sulfide melt collected incompatible PGE (Rh, Pt, Pd) to produce the typical flat chondrite-normalized pattern of sulfide-rich chromite ores. 相似文献
19.
Stuart E. G. Findlay 《Estuaries and Coasts》1982,5(4):322-324
The effect of sampling scale on apparent distribution of meiofauna was demonstrated by simulating the sampling of a “known” distribution with three different sampling schemes. Small-scale sampling gave better reproduction of the original pattern than larger scales, which tended to homogenize patchiness. My results suggest that for intracommunity meiofaunal research, roughly fifty 0.5–1.0 cm2 cores is a reasonable first guess “optimum” sampling scheme. The position of the cores should be random but their position relative to each other should be noted so the spatial information may be utilized in analysis. 相似文献